[PATCH v5 00/17] barebox deep probe support

[PATCH v5 00/17] barebox deep probe support

[Sascha Hauer]

Another round to address the last review feedback

Changes since v4:
  - Pass of_device_id array to BAREBOX_DEEP_PROBE_ENABLE()
  - convert dev_warn to dev_err

Changes since v3:
  - Add deep-probe support for pinctrl
  - Port over Phytec Physom to deep-probe
  - Make sure console is probed ealier at postconsole_initcall time
  - Let of_devices_ensure_probed_by_dev_id() probe all matching devices, not
    only the first one
  - add GPIO support to the base deep probe patch

Lucas Stach (1):
  of: base: move memory init from DT to initcall

Marco Felsch (9):
  imx53: remove unused imx53_add_nand
  of: platform: remove check of already added devices
  of: platform: Keep track of populated platform devices
  of: base: move clock init from of_probe() to barebox_register_of()
  initcall: add of_populate_initcall
  common: add initial barebox deep-probe support
  ARM: i.MX: esdctl: add deep-probe support
  ARM: stm32mp: ddrctrl: add deep-probe support
  ARM: boards: mx6-sabrelite: add deep-probe support

Sascha Hauer (7):
  of: Set of_chosen and of_model earlier
  of: implement of_get_stdoutpath()
  pinctrl: Find controller node first
  common: Explicitly probe consoles earlier with deep probe
  pinctrl: Add deep probe support
  ARM: i.MX Phytec physom: convert to board driver
  ARM: i.MX Phytec physom: Add deep-probe support

 .../boards/freescale-mx6-sabrelite/board.c    |  58 +++--
 arch/arm/boards/phytec-som-imx6/board.c       | 159 +++++++++---
 arch/arm/mach-imx/esdctl.c                    |  12 +-
 .../arm/mach-imx/include/mach/devices-imx53.h |  27 --
 arch/arm/mach-stm32mp/ddrctrl.c               |  12 +-
 common/Makefile                               |   1 +
 common/deep-probe.c                           |  39 +++
 drivers/base/driver.c                         |  11 +-
 drivers/clk/clk.c                             |   5 +
 drivers/i2c/i2c.c                             |   8 +
 drivers/of/base.c                             |  61 +++--
 drivers/of/of_gpio.c                          |   4 +
 drivers/of/platform.c                         | 230 +++++++++++++++---
 drivers/pinctrl/pinctrl.c                     |  16 +-
 drivers/regulator/core.c                      |   6 +
 drivers/reset/core.c                          |   4 +
 drivers/spi/spi.c                             |   2 +
 include/asm-generic/barebox.lds.h             |  11 +-
 include/deep-probe.h                          |  26 ++
 include/init.h                                |  10 +-
 include/of.h                                  |  33 +++
 21 files changed, 587 insertions(+), 148 deletions(-)
 create mode 100644 common/deep-probe.c
 create mode 100644 include/deep-probe.h

-- 
2.29.2


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[PATCH 01/17] imx53: remove unused imx53_add_nand

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

The TX53 board was the last user of this function. This board was
converted to device tree based boot by commit 971366078893
("i.MX53/TX53: rework to dts based boot") so we can remove this
legacy helper.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-2-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 .../arm/mach-imx/include/mach/devices-imx53.h | 27 -------------------
 1 file changed, 27 deletions(-)

diff --git a/arch/arm/mach-imx/include/mach/devices-imx53.h b/arch/arm/mach-imx/include/mach/devices-imx53.h
index e5c257a40b..3d1e8a27a8 100644
--- a/arch/arm/mach-imx/include/mach/devices-imx53.h
+++ b/arch/arm/mach-imx/include/mach/devices-imx53.h
@@ -77,33 +77,6 @@ static inline struct device_d *imx53_add_mmc3(struct esdhc_platform_data *pdata)
 	return imx_add_esdhc_imx5((void *)MX53_ESDHC4_BASE_ADDR, 3, pdata);
 }
 
-static inline struct device_d *imx53_add_nand(struct imx_nand_platform_data *pdata)
-{
-	struct resource res[] = {
-		{
-			.start = MX53_NFC_BASE_ADDR,
-			.end = MX53_NFC_BASE_ADDR + SZ_4K - 1,
-			.flags = IORESOURCE_MEM,
-		}, {
-			.start = MX53_NFC_AXI_BASE_ADDR,
-			.end = MX53_NFC_AXI_BASE_ADDR + SZ_4K - 1,
-			.flags = IORESOURCE_MEM,
-		},
-	};
-	struct device_d *dev = xzalloc(sizeof(*dev));
-
-	dev->resource = xzalloc(sizeof(struct resource) * ARRAY_SIZE(res));
-	memcpy(dev->resource, res, sizeof(struct resource) * ARRAY_SIZE(res));
-	dev->num_resources = ARRAY_SIZE(res);
-	dev_set_name(dev, "imx_nand");
-	dev->id = DEVICE_ID_DYNAMIC;
-	dev->platform_data = pdata;
-
-	platform_device_register(dev);
-
-	return dev;
-}
-
 static inline struct device_d *imx53_add_kpp(struct matrix_keymap_data *pdata)
 {
 	return imx_add_kpp((void *)MX53_KPP_BASE_ADDR, pdata);
-- 
2.29.2


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[PATCH 02/17] of: platform: remove check of already added devices

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

This check is a relict of the early barebox device tree days, where
devices were added by machine and/or board code too. The check ensured
too not populate the same device twice. Nowadays _real_ hardware devices
(devices with hardware resources) which are not auto enumerable should
only be added using the device tree. Remove the check to cleanup the
code and to remove looping over each device every time
of_platform_device_create() is called instead of keeping it for legacy
boards/machines. Those legacy boards/machines should be converted
instead.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-3-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/platform.c | 31 +------------------------------
 1 file changed, 1 insertion(+), 30 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 21c7cce1a5..51781798c6 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -101,7 +101,7 @@ struct device_d *of_platform_device_create(struct device_node *np,
 	struct device_d *dev;
 	struct resource *res = NULL, temp_res;
 	resource_size_t resinval;
-	int i, j, ret, num_reg = 0, match;
+	int i, ret, num_reg = 0;
 
 	if (!of_device_is_available(np))
 		return NULL;
@@ -121,35 +121,6 @@ struct device_d *of_platform_device_create(struct device_node *np,
 				return NULL;
 			}
 		}
-
-		/*
-		 * A device may already be registered as platform_device.
-		 * Instead of registering the same device again, just
-		 * add this node to the existing device.
-		 */
-		for_each_device(dev) {
-			if (!dev->resource)
-				continue;
-
-			for (i = 0, match = 0; i < num_reg; i++)
-				for (j = 0; j < dev->num_resources; j++)
-					if (dev->resource[j].start ==
-						res[i].start &&
-					    dev->resource[j].end ==
-						res[i].end) {
-						match++;
-						break;
-					}
-
-			/* check if all address resources match */
-			if (match == num_reg) {
-				debug("connecting %s to %s\n",
-					np->name, dev_name(dev));
-				dev->device_node = np;
-				free(res);
-				return dev;
-			}
-		}
 	}
 
 	/* setup generic device info */
-- 
2.29.2


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[PATCH 03/17] of: platform: Keep track of populated platform devices

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

Linux does not allow to populate the same of device more than once.
Linux uses the OF_POPULATED flag for that purpose. Align the logic with
the current linux state with the exception that we are returning the
already created device. This is needed for the later added deep-probe
mechanism.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-4-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/platform.c | 20 +++++++++++++++++++-
 include/of.h          |  1 +
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 51781798c6..01de6f98af 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -106,6 +106,13 @@ struct device_d *of_platform_device_create(struct device_node *np,
 	if (!of_device_is_available(np))
 		return NULL;
 
+	/*
+	 * Linux uses the OF_POPULATED flag to skip already populated/created
+	 * devices.
+	 */
+	if (np->dev)
+		return np->dev;
+
 	/* count the io resources */
 	if (of_can_translate_address(np))
 		while (of_address_to_resource(np, num_reg, &temp_res) == 0)
@@ -141,8 +148,10 @@ struct device_d *of_platform_device_create(struct device_node *np,
 		(num_reg) ? &dev->resource[0].start : &resinval);
 
 	ret = platform_device_register(dev);
-	if (!ret)
+	if (!ret) {
+		np->dev = dev;
 		return dev;
+	}
 
 	free(dev);
 	if (num_reg)
@@ -223,6 +232,13 @@ static struct device_d *of_amba_device_create(struct device_node *np)
 	if (!of_device_is_available(np))
 		return NULL;
 
+	/*
+	 * Linux uses the OF_POPULATED flag to skip already populated/created
+	 * devices.
+	 */
+	if (np->dev)
+		return np->dev;
+
 	dev = xzalloc(sizeof(*dev));
 
 	/* setup generic device info */
@@ -246,6 +262,8 @@ static struct device_d *of_amba_device_create(struct device_node *np)
 	if (ret)
 		goto amba_err_free;
 
+	np->dev = &dev->dev;
+
 	return &dev->dev;
 
 amba_err_free:
diff --git a/include/of.h b/include/of.h
index 645f429bde..1f68d78b24 100644
--- a/include/of.h
+++ b/include/of.h
@@ -35,6 +35,7 @@ struct device_node {
 	struct list_head parent_list;
 	struct list_head list;
 	phandle phandle;
+	struct device_d *dev;
 };
 
 struct of_device_id {
-- 
2.29.2


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[PATCH 04/17] of: base: move memory init from DT to initcall

[Sascha Hauer]

From: Lucas Stach <dev@lynxeye.de>

Instead of calling it from of_probe, convert it to a initcall at
the appropriate level. This allows to move of_probe to later in
the init sequence while keeping the memory init at the same place,
which is important as many other drivers need the valid memory area
to be set up properly.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-5-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/base.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 6fe02649ee..549a0a2c2c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2281,10 +2281,13 @@ const struct of_device_id of_default_bus_match_table[] = {
 	}
 };
 
-static void of_probe_memory(void)
+static int of_probe_memory(void)
 {
 	struct device_node *memory = root_node;
 
+	if (!IS_ENABLED(CONFIG_OFDEVICE))
+		return 0;
+
 	/* Parse all available node with "memory" device_type */
 	while (1) {
 		memory = of_find_node_by_type(memory, "memory");
@@ -2293,7 +2296,10 @@ static void of_probe_memory(void)
 
 		of_add_memory(memory, false);
 	}
+
+	return 0;
 }
+mem_initcall(of_probe_memory);
 
 static void of_platform_device_create_root(struct device_node *np)
 {
@@ -2323,8 +2329,6 @@ int of_probe(void)
 	if (of_model)
 		barebox_set_model(of_model);
 
-	of_probe_memory();
-
 	firmware = of_find_node_by_path("/firmware");
 	if (firmware)
 		of_platform_populate(firmware, NULL, NULL);
-- 
2.29.2


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[PATCH 05/17] of: base: move clock init from of_probe() to barebox_register_of()

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

This is required for the new deep-probe mechanism. Barebox deep-probe
calls of_probe() very late and so clock drivers using the old
CLK_OF_DECLARE_DRIVER() mechanism are added very late. This would break
the deep-probe approach.

Move of_clk_init() and call it right before of_probe() should have no
impact because of_clk_init() depends only on an unflatten dtb.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-6-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/base.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 549a0a2c2c..7b3cfa8393 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1707,8 +1707,10 @@ void barebox_register_of(struct device_node *root)
 	of_set_root_node(root);
 	of_fix_tree(root);
 
-	if (IS_ENABLED(CONFIG_OFDEVICE))
+	if (IS_ENABLED(CONFIG_OFDEVICE)) {
+		of_clk_init(root, NULL);
 		of_probe();
+	}
 }
 
 void barebox_register_fdt(const void *dtb)
@@ -2335,7 +2337,6 @@ int of_probe(void)
 
 	of_platform_device_create_root(root_node);
 
-	of_clk_init(root_node, NULL);
 	of_platform_populate(root_node, of_default_bus_match_table, NULL);
 
 	return 0;
-- 
2.29.2


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[PATCH 06/17] of: Set of_chosen and of_model earlier

[Sascha Hauer]

of_chosen and of_model can be set once we have the device tree root node,
no need to wait until we probe the tree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/base.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 7b3cfa8393..1518854d2e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1682,6 +1682,9 @@ int of_modalias_node(struct device_node *node, char *modalias, int len)
 }
 EXPORT_SYMBOL_GPL(of_modalias_node);
 
+static struct device_node *of_chosen;
+static const char *of_model;
+
 struct device_node *of_get_root_node(void)
 {
 	return root_node;
@@ -1694,6 +1697,12 @@ int of_set_root_node(struct device_node *node)
 
 	root_node = node;
 
+	of_chosen = of_find_node_by_path("/chosen");
+	of_property_read_string(root_node, "model", &of_model);
+
+	if (of_model)
+		barebox_set_model(of_model);
+
 	of_alias_scan();
 
 	return 0;
@@ -2263,9 +2272,6 @@ int of_add_memory(struct device_node *node, bool dump)
 	return 0;
 }
 
-static struct device_node *of_chosen;
-static const char *of_model;
-
 const char *of_get_model(void)
 {
 	return of_model;
@@ -2325,12 +2331,6 @@ int of_probe(void)
 	if(!root_node)
 		return -ENODEV;
 
-	of_chosen = of_find_node_by_path("/chosen");
-	of_property_read_string(root_node, "model", &of_model);
-
-	if (of_model)
-		barebox_set_model(of_model);
-
 	firmware = of_find_node_by_path("/firmware");
 	if (firmware)
 		of_platform_populate(firmware, NULL, NULL);
-- 
2.29.2


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[PATCH 07/17] of: implement of_get_stdoutpath()

[Sascha Hauer]

For deep probe support it will be useful to have a function to
get the node corresponding to the stdoutpath. of_device_is_stdout_path()
already has that functionality in it, so make a separate funcion from
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/base.c | 15 ++++++++++-----
 include/of.h      |  6 ++++++
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 1518854d2e..1e3921f915 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2434,16 +2434,13 @@ void of_delete_node(struct device_node *node)
 		of_set_root_node(NULL);
 }
 
-int of_device_is_stdout_path(struct device_d *dev)
+struct device_node *of_get_stdoutpath(void)
 {
 	struct device_node *dn;
 	const char *name;
 	const char *p;
 	char *q;
 
-	if (!dev->device_node)
-		return 0;
-
 	name = of_get_property(of_chosen, "stdout-path", NULL);
 	if (!name)
 		name = of_get_property(of_chosen, "linux,stdout-path", NULL);
@@ -2462,7 +2459,15 @@ int of_device_is_stdout_path(struct device_d *dev)
 
 	free(q);
 
-	return dn == dev->device_node;
+	return dn;
+}
+
+int of_device_is_stdout_path(struct device_d *dev)
+{
+	if (!dev->device_node)
+		return 0;
+
+	return dev->device_node == of_get_stdoutpath();
 }
 
 /**
diff --git a/include/of.h b/include/of.h
index 1f68d78b24..a3527c1afd 100644
--- a/include/of.h
+++ b/include/of.h
@@ -280,6 +280,7 @@ struct cdev *of_parse_partition(struct cdev *cdev, struct device_node *node);
 int of_parse_partitions(struct cdev *cdev, struct device_node *node);
 int of_fixup_partitions(struct device_node *np, struct cdev *cdev);
 int of_partitions_register_fixup(struct cdev *cdev);
+struct device_node *of_get_stdoutpath(void);
 int of_device_is_stdout_path(struct device_d *dev);
 const char *of_get_model(void);
 void *of_flatten_dtb(struct device_node *node);
@@ -317,6 +318,11 @@ static inline int of_partitions_register_fixup(struct cdev *cdev)
 	return -ENOSYS;
 }
 
+static inline struct device_node *of_get_stdoutpath(void)
+{
+	return NULL;
+}
+
 static inline int of_device_is_stdout_path(struct device_d *dev)
 {
 	return 0;
-- 
2.29.2


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[PATCH 08/17] initcall: add of_populate_initcall

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

Add dedicated initcall for of_probe() which is required for the following
device-on-demand/deep-probe mechanism.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-7-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 include/asm-generic/barebox.lds.h |  1 +
 include/init.h                    | 10 +++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
index 6971e2c1d2..a7d32160d1 100644
--- a/include/asm-generic/barebox.lds.h
+++ b/include/asm-generic/barebox.lds.h
@@ -33,6 +33,7 @@
 	KEEP(*(.initcall.12))			\
 	KEEP(*(.initcall.13))			\
 	KEEP(*(.initcall.14))			\
+	KEEP(*(.initcall.15))			\
 	__barebox_initcalls_end = .;
 
 #define BAREBOX_EXITCALLS			\
diff --git a/include/init.h b/include/init.h
index 2d61bc8963..c695f99867 100644
--- a/include/init.h
+++ b/include/init.h
@@ -47,6 +47,9 @@ typedef void (*exitcall_t)(void);
  * initializes variables that couldn't be statically initialized.
  *
  * This only exists for built-in code, not for modules.
+ *
+ * The only purpose for "of_populate" is to call of_probe() other functions are
+ * not allowed.
  */
 #define pure_initcall(fn)		__define_initcall("0",fn,0)
 
@@ -61,9 +64,10 @@ typedef void (*exitcall_t)(void);
 #define fs_initcall(fn)			__define_initcall("9",fn,9)
 #define device_initcall(fn)		__define_initcall("10",fn,10)
 #define crypto_initcall(fn)		__define_initcall("11",fn,11)
-#define late_initcall(fn)		__define_initcall("12",fn,12)
-#define environment_initcall(fn)	__define_initcall("13",fn,13)
-#define postenvironment_initcall(fn)	__define_initcall("14",fn,14)
+#define of_populate_initcall(fn)	__define_initcall("12",fn,12)
+#define late_initcall(fn)		__define_initcall("13",fn,13)
+#define environment_initcall(fn)	__define_initcall("14",fn,14)
+#define postenvironment_initcall(fn)	__define_initcall("15",fn,15)
 
 #define early_exitcall(fn)		__define_exitcall("0",fn,0)
 #define predevshutdown_exitcall(fn)	__define_exitcall("1",fn,1)
-- 
2.29.2


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[PATCH 09/17] common: add initial barebox deep-probe support

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

The barebox 'deep probe' or 'probe on demand' mechanism is the answer of
unwanted -EPROBE_DEFER failures. The EPROBE_DEFER error code was
introduced by commit ab3da15bc14c ("base: Introduce deferred probing")
and since then it causes a few problems.

The error is returned if either the device is not yet present or the
driver is not yet registered. This makes sense on linux systems where
modules and hot-plug devices are used very often but not for barebox.
The module support is rarely used and devices aren't hot pluggable.

The current barebox behaviour populates all devices before the drivers
are registered so all devices are present during the driver
registration. So the driver probe() function gets called immediately
after the driver registration and causes the -EPROBE_DEFER error if this
driver depends on an other not yet registered driver.

To get rid of the EPROBE_DEFER error code we need to reorder the device
population and the driver registration. All drivers must be registered
first. In an ideal world all driver can be registered by the same
initcall level. Then devices are getting populated which causes calling
the driver probe() function but this time resources/devices are created
on demand if not yet available.

Dependencies between devices are normally expressed as references to
other device nodes. With deep probe barebox provides helper functions
which take a device node and probe the device behind that node if
necessary. This means instead of returning -EPROBE_DEFER, we can now
make the desired resources available once we need them.

If the resource can't be created we are returning -ENODEV since we are
not supporting hot-plugging. Dropping EPROBE_DEFER is the long-term
goal, avoid initcall shifting is the short-term goal.

Call it deep-probe since the on-demand device creation can create very
deep stacks. This commit adds the initial support for: spi, i2c, reset,
regulator, gpio and clk resource on-demand creation. The deep-probe
mechanism must be enabled for each board to avoid breaking changes using
deep_probe_enable(). This can be changed later after all boards are
converted to the new mechanism.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-8-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/Makefile                   |   1 +
 common/deep-probe.c               |  39 +++++++
 drivers/base/driver.c             |  11 +-
 drivers/clk/clk.c                 |   5 +
 drivers/i2c/i2c.c                 |   8 ++
 drivers/of/base.c                 |  13 ++-
 drivers/of/of_gpio.c              |   4 +
 drivers/of/platform.c             | 162 ++++++++++++++++++++++++++++++
 drivers/regulator/core.c          |   6 ++
 drivers/reset/core.c              |   4 +
 drivers/spi/spi.c                 |   2 +
 include/asm-generic/barebox.lds.h |  10 +-
 include/deep-probe.h              |  26 +++++
 include/of.h                      |  26 +++++
 14 files changed, 314 insertions(+), 3 deletions(-)
 create mode 100644 common/deep-probe.c
 create mode 100644 include/deep-probe.h

diff --git a/common/Makefile b/common/Makefile
index c0b45d263e..aa06e6e82e 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -3,6 +3,7 @@ obj-y				+= memory_display.o
 pbl-$(CONFIG_PBL_CONSOLE)	+= memory_display.o
 obj-y				+= clock.o
 obj-y				+= console_common.o
+obj-y				+= deep-probe.o
 obj-y				+= startup.o
 obj-y				+= misc.o
 obj-pbl-y			+= memsize.o
diff --git a/common/deep-probe.c b/common/deep-probe.c
new file mode 100644
index 0000000000..1020ad93b7
--- /dev/null
+++ b/common/deep-probe.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <deep-probe.h>
+#include <of.h>
+
+enum deep_probe_state {
+	DEEP_PROBE_UNKONWN = -1,
+	DEEP_PROBE_NOT_SUPPORTED,
+	DEEP_PROBE_SUPPORTED
+};
+
+static enum deep_probe_state boardstate = DEEP_PROBE_UNKONWN;
+
+bool deep_probe_is_supported(void)
+{
+	struct deep_probe_entry *board;
+
+	if (boardstate > DEEP_PROBE_UNKONWN)
+		return boardstate;
+
+	/* determine boardstate */
+	for (board = &__barebox_deep_probe_start;
+	     board != &__barebox_deep_probe_end; board++) {
+		const struct of_device_id *matches = board->device_id;
+
+		for (; matches->compatible; matches++) {
+			if (of_machine_is_compatible(matches->compatible)) {
+				boardstate = DEEP_PROBE_SUPPORTED;
+				printk("Deep probe supported due to %s\n", matches->compatible);
+				return true;
+			}
+		}
+	}
+
+	boardstate = DEEP_PROBE_NOT_SUPPORTED;
+	return false;
+}
+EXPORT_SYMBOL_GPL(deep_probe_is_supported);
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index f60533c59e..58e6a8fcc9 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -21,6 +21,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <deep-probe.h>
 #include <driver.h>
 #include <malloc.h>
 #include <console.h>
@@ -95,7 +96,15 @@ int device_probe(struct device_d *dev)
 	if (ret == -EPROBE_DEFER) {
 		list_del(&dev->active);
 		list_add(&dev->active, &deferred);
-		dev_dbg(dev, "probe deferred\n");
+
+		/*
+		 * -EPROBE_DEFER should never appear on a deep-probe machine so
+		 * inform the user immediately.
+		 */
+		if (deep_probe_is_supported())
+			dev_err(dev, "probe deferred\n");
+		else
+			dev_dbg(dev, "probe deferred\n");
 		return ret;
 	}
 
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index b04d44593b..e40dfae9ce 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -439,6 +439,11 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
 {
 	struct of_clk_provider *provider;
 	struct clk *clk = ERR_PTR(-EPROBE_DEFER);
+	int ret;
+
+	ret = of_device_ensure_probed(clkspec->np);
+	if (ret)
+		return ERR_PTR(ret);
 
 	/* Check if we have such a provider in our array */
 	list_for_each_entry(provider, &of_clk_providers, link) {
diff --git a/drivers/i2c/i2c.c b/drivers/i2c/i2c.c
index 57d8c7017f..12aac42794 100644
--- a/drivers/i2c/i2c.c
+++ b/drivers/i2c/i2c.c
@@ -407,6 +407,9 @@ static struct i2c_client *i2c_new_device(struct i2c_adapter *adapter,
 	}
 	client->dev.info = i2c_info;
 
+	if (chip->of_node)
+		chip->of_node->dev = &client->dev;
+
 	return client;
 }
 
@@ -548,6 +551,11 @@ struct i2c_adapter *i2c_get_adapter(int busnum)
 struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
 {
 	struct i2c_adapter *adap;
+	int ret;
+
+	ret = of_device_ensure_probed(node);
+	if (ret)
+		return ERR_PTR(ret);
 
 	for_each_i2c_adapter(adap)
 		if (adap->dev.device_node == node)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 1e3921f915..00141a394f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -15,6 +15,7 @@
  * GNU General Public License for more details.
  */
 #include <common.h>
+#include <deep-probe.h>
 #include <of.h>
 #include <of_address.h>
 #include <errno.h>
@@ -1708,6 +1709,15 @@ int of_set_root_node(struct device_node *node)
 	return 0;
 }
 
+static int barebox_of_populate(void)
+{
+	if (IS_ENABLED(CONFIG_OFDEVICE) && deep_probe_is_supported())
+		return of_probe();
+
+	return 0;
+}
+of_populate_initcall(barebox_of_populate);
+
 void barebox_register_of(struct device_node *root)
 {
 	if (root_node)
@@ -1718,7 +1728,8 @@ void barebox_register_of(struct device_node *root)
 
 	if (IS_ENABLED(CONFIG_OFDEVICE)) {
 		of_clk_init(root, NULL);
-		of_probe();
+		if (!deep_probe_is_supported())
+			of_probe();
 	}
 }
 
diff --git a/drivers/of/of_gpio.c b/drivers/of/of_gpio.c
index 7cbeeaf69e..4d3ded0599 100644
--- a/drivers/of/of_gpio.c
+++ b/drivers/of/of_gpio.c
@@ -63,6 +63,10 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
 		return ret;
 	}
 
+	ret = of_device_ensure_probed(out_args.np);
+	if (ret)
+		return ret;
+
 	dev = of_find_device_by_node(out_args.np);
 	if (!dev) {
 		pr_debug("%s: unable to find device of node %s\n",
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 01de6f98af..4b79a9bc10 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -15,6 +15,7 @@
  * GNU General Public License for more details.
  */
 #include <common.h>
+#include <deep-probe.h>
 #include <malloc.h>
 #include <of.h>
 #include <of_address.h>
@@ -29,6 +30,12 @@
 struct device_d *of_find_device_by_node(struct device_node *np)
 {
 	struct device_d *dev;
+	int ret;
+
+	ret = of_device_ensure_probed(np);
+	if (ret)
+		return NULL;
+
 	for_each_device(dev)
 		if (dev->device_node == np)
 			return dev;
@@ -353,3 +360,158 @@ int of_platform_populate(struct device_node *root,
 	return rc;
 }
 EXPORT_SYMBOL_GPL(of_platform_populate);
+
+static struct device_d *of_device_create_on_demand(struct device_node *np)
+{
+	struct device_node *parent;
+	struct device_d *parent_dev, *dev;
+
+	parent = of_get_parent(np);
+	if (!parent)
+		return NULL;
+
+	/* Create all parent devices needed for the requested device */
+	parent_dev = parent->dev ? : of_device_create_on_demand(parent);
+	if (IS_ERR(parent_dev))
+		return parent_dev;
+
+	/*
+	 * Parent devices like i2c/spi controllers are populating their own
+	 * devices. So it can be that the requested device already exists after
+	 * the parent device creation.
+	 */
+	if (np->dev)
+		return np->dev;
+
+	pr_debug("%s: Create %s (%s) on demand\n", __func__,
+		 np->name, np->full_name);
+
+	if (of_device_is_compatible(np, "arm,primecell"))
+		dev = of_amba_device_create(np);
+	else
+		dev = of_platform_device_create(np, parent_dev);
+
+	return dev ? : ERR_PTR(-ENODEV);
+}
+
+/**
+ * of_device_ensure_probed() - ensures that a device is probed
+ *
+ * @np: the device_node handle which should be probed
+ *
+ * Ensures that the device is populated and probed so frameworks can make use of
+ * it.
+ *
+ * Return: %0 on success
+ *	   %-ENODEV if either the device can't be populated, the driver is
+ *	     missing or the driver probe returns an error.
+ */
+int of_device_ensure_probed(struct device_node *np)
+{
+	struct device_d *dev;
+
+	if (!deep_probe_is_supported())
+		return 0;
+
+	dev = of_device_create_on_demand(np);
+	if (IS_ERR(dev))
+		return PTR_ERR(dev);
+
+	BUG_ON(!dev);
+
+	/*
+	 * The deep-probe mechanism relies on the fact that all necessary
+	 * drivers are added before the device creation. Furthermore deep-probe
+	 * is the answer to the EPROBE_DEFER errno so we must ensure that the
+	 * driver was probed successfully after the device creation. Both
+	 * requirements are fulfilled if 'dev->driver' is not NULL.
+	 */
+	if (!dev->driver)
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_device_ensure_probed);
+
+/**
+ * of_device_ensure_probed_by_alias() - ensures that a device is probed
+ *
+ * @alias: the alias string to search for a device
+ *
+ * The function search for a given alias string and ensures that the device is
+ * populated and probed if found.
+ *
+ * Return: %0 on success
+ *	   %-ENODEV if either the device can't be populated, the driver is
+ *	     missing or the driver probe returns an error
+ *	   %-EINVAL if alias can't be found
+ */
+int of_device_ensure_probed_by_alias(const char *alias)
+{
+	struct device_node *dev_node;
+
+	dev_node = of_find_node_by_alias(NULL, alias);
+	if (!dev_node)
+		return -EINVAL;
+
+	return of_device_ensure_probed(dev_node);
+}
+EXPORT_SYMBOL_GPL(of_device_ensure_probed_by_alias);
+
+/**
+ * of_devices_ensure_probed_by_dev_id() - ensures that devices are probed
+ *
+ * @ids: the matching 'struct of_device_id' ids
+ *
+ * The function start searching the device tree from @np and populates and
+ * probes devices which match @ids.
+ *
+ * Return: %0 on success
+ *	   %-ENODEV if either the device wasn't found, can't be populated,
+ *	     the driver is missing or the driver probe returns an error
+ */
+int of_devices_ensure_probed_by_dev_id(const struct of_device_id *ids)
+{
+	struct device_node *np;
+	int err, ret = 0;
+
+	for_each_matching_node(np, ids) {
+		if (!of_device_is_available(np))
+			continue;
+
+		err = of_device_ensure_probed(np);
+		if (err)
+			ret = err;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(of_devices_ensure_probed_by_dev_id);
+
+/**
+ * of_devices_ensure_probed_by_property() - ensures that devices are probed
+ *
+ * @property_name: The property name to search for
+ *
+ * The function starts searching the whole device tree and populates and probes
+ * devices which matches @property_name.
+ *
+ * Return: %0 on success
+ *	   %-ENODEV if either the device wasn't found, can't be populated,
+ *	     the driver is missing or the driver probe returns an error
+ */
+int of_devices_ensure_probed_by_property(const char *property_name)
+{
+	struct device_node *node;
+
+	for_each_node_with_property(node, property_name) {
+		int ret;
+
+		ret = of_device_ensure_probed(node);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_devices_ensure_probed_by_property);
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index ac3a9b048e..097f7d779b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -175,6 +175,7 @@ int of_regulator_register(struct regulator_dev *rd, struct device_node *node)
 		return PTR_ERR(ri);
 
 	ri->node = node;
+	node->dev = rd->dev;
 
 	if (rd->desc->off_on_delay)
 		ri->enable_time_us = rd->desc->off_on_delay;
@@ -197,6 +198,7 @@ static struct regulator_internal *of_regulator_get(struct device_d *dev, const c
 	char *propname;
 	struct regulator_internal *ri;
 	struct device_node *node;
+	int ret;
 
 	propname = basprintf("%s-supply", supply);
 
@@ -228,6 +230,10 @@ static struct regulator_internal *of_regulator_get(struct device_d *dev, const c
 		goto out;
 	}
 
+	ret = of_device_ensure_probed(node);
+	if (ret)
+		return ERR_PTR(ret);
+
 	list_for_each_entry(ri, &regulator_list, list) {
 		if (ri->node == node) {
 			dev_dbg(dev, "Using %s regulator from %s\n",
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 26a54f21df..e2edca6658 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -168,6 +168,10 @@ static struct reset_control *of_reset_control_get(struct device_node *node,
 	if (ret)
 		return ERR_PTR(ret);
 
+	ret = of_device_ensure_probed(args.np);
+	if (ret)
+		return ERR_PTR(ret);
+
 	rcdev = NULL;
 	list_for_each_entry(r, &reset_controller_list, list) {
 		if (args.np == r->of_node) {
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 8421d9d7c1..d1d3bdcc41 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -107,6 +107,8 @@ struct spi_device *spi_new_device(struct spi_controller *ctrl,
 	if (status)
 		goto fail;
 
+	chip->device_node->dev = &proxy->dev;
+
 	return proxy;
 fail:
 	free(proxy);
diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
index a7d32160d1..c5f9d97547 100644
--- a/include/asm-generic/barebox.lds.h
+++ b/include/asm-generic/barebox.lds.h
@@ -114,6 +114,13 @@
 	KEEP(*(.rsa_keys.rodata.*));		\
 	__rsa_keys_end = .;			\
 
+#define BAREBOX_DEEP_PROBE			\
+	STRUCT_ALIGN();				\
+	__barebox_deep_probe_start = .;		\
+	KEEP(*(SORT_BY_NAME(.barebox_deep_probe*)))	\
+	__barebox_deep_probe_end = .;
+
+
 #ifdef CONFIG_CONSTRUCTORS
 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 			__ctors_start = .;                 \
@@ -136,7 +143,8 @@
 	BAREBOX_CLK_TABLE			\
 	BAREBOX_DTB				\
 	BAREBOX_RSA_KEYS			\
-	BAREBOX_PCI_FIXUP
+	BAREBOX_PCI_FIXUP			\
+	BAREBOX_DEEP_PROBE
 
 #if defined(CONFIG_ARCH_BAREBOX_MAX_BARE_INIT_SIZE) && \
 CONFIG_ARCH_BAREBOX_MAX_BARE_INIT_SIZE < CONFIG_BAREBOX_MAX_BARE_INIT_SIZE
diff --git a/include/deep-probe.h b/include/deep-probe.h
new file mode 100644
index 0000000000..f75ad1065c
--- /dev/null
+++ b/include/deep-probe.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __DEEP_PROBE_H
+#define __DEEP_PROBE_H
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+
+struct deep_probe_entry {
+	const struct of_device_id *device_id;
+};
+
+bool deep_probe_is_supported(void);
+
+extern struct deep_probe_entry __barebox_deep_probe_start;
+extern struct deep_probe_entry __barebox_deep_probe_end;
+
+#define __BAREBOX_DEEP_PROBE_ENABLE(_entry,_device_id)			\
+	static const struct deep_probe_entry _entry			\
+	__attribute__ ((used,section (".barebox_deep_probe_" __stringify(_entry)))) = { \
+		.device_id = _device_id,				\
+	}
+
+#define BAREBOX_DEEP_PROBE_ENABLE(_device_id)	\
+	__BAREBOX_DEEP_PROBE_ENABLE(__UNIQUE_ID(deepprobe),_device_id)
+
+#endif /* __DEEP_PROBE_H */
diff --git a/include/of.h b/include/of.h
index a3527c1afd..78c06ec2c3 100644
--- a/include/of.h
+++ b/include/of.h
@@ -276,6 +276,11 @@ extern struct device_d *of_device_enable_and_register_by_name(const char *name);
 extern struct device_d *of_device_enable_and_register_by_alias(
 							const char *alias);
 
+extern int of_device_ensure_probed(struct device_node *np);
+extern int of_device_ensure_probed_by_alias(const char *alias);
+extern int of_devices_ensure_probed_by_property(const char *property_name);
+extern int of_devices_ensure_probed_by_dev_id(const struct of_device_id *ids);
+
 struct cdev *of_parse_partition(struct cdev *cdev, struct device_node *node);
 int of_parse_partitions(struct cdev *cdev, struct device_node *node);
 int of_fixup_partitions(struct device_node *np, struct cdev *cdev);
@@ -359,6 +364,27 @@ static inline struct device_d *of_platform_device_create(struct device_node *np,
 	return NULL;
 }
 
+static inline int of_device_ensure_probed(struct device_node *np)
+{
+	return 0;
+}
+
+static inline int of_device_ensure_probed_by_alias(const char *alias)
+{
+	return 0;
+}
+
+static inline int of_devices_ensure_probed_by_property(const char *property_name)
+{
+	return 0;
+}
+
+static inline int
+of_devices_ensure_probed_by_dev_id(const struct of_device_id *ids)
+{
+	return 0;
+}
+
 static inline int of_bus_n_addr_cells(struct device_node *np)
 {
 	return 0;
-- 
2.29.2


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[PATCH 10/17] pinctrl: Find controller node first

[Sascha Hauer]

The pinctrl controller node is the first parent node that has a compatible
property. Use that information to find the node without iterating up to
the root node.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/pinctrl/pinctrl.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl.c b/drivers/pinctrl/pinctrl.c
index b36521ef83..84ac61f2d9 100644
--- a/drivers/pinctrl/pinctrl.c
+++ b/drivers/pinctrl/pinctrl.c
@@ -85,12 +85,15 @@ static int pinctrl_config_one(struct device_node *np)
 		pinctrl_node = pinctrl_node->parent;
 		if (!pinctrl_node)
 			return -ENODEV;
-		pdev = find_pinctrl(pinctrl_node);
-		if (pdev)
+		if (of_get_property(pinctrl_node, "compatible", NULL))
 			break;
 	}
 
-	return pdev->ops->set_state(pdev, np);
+	pdev = find_pinctrl(pinctrl_node);
+	if (pdev)
+		return pdev->ops->set_state(pdev, np);
+	else
+		return -ENODEV;
 }
 
 int of_pinctrl_select_state(struct device_node *np, const char *name)
-- 
2.29.2


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[PATCH 11/17] common: Explicitly probe consoles earlier with deep probe

[Sascha Hauer]

With deep probe support the device providing the console can come quite
late in the probe order. Make sure it's probed at postconsole_initcall
time as it used to be without deep probe support so that we get output
earlier.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/platform.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 4b79a9bc10..6b6f904573 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -515,3 +515,20 @@ int of_devices_ensure_probed_by_property(const char *property_name)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(of_devices_ensure_probed_by_property);
+
+static int of_stdoutpath_init(void)
+{
+	struct device_node *np;
+
+	np = of_get_stdoutpath();
+	if (!np)
+		return 0;
+
+	/*
+	 * With deep probe support the device providing the console
+	 * can come quite late in the probe order. Make sure it's
+	 * probed now so that we get output earlier.
+	 */
+	return of_device_ensure_probed(np);
+}
+postconsole_initcall(of_stdoutpath_init);
-- 
2.29.2


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[PATCH 12/17] pinctrl: Add deep probe support

[Sascha Hauer]

This adds deep probe support for pinctrl.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/pinctrl/pinctrl.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl.c b/drivers/pinctrl/pinctrl.c
index 84ac61f2d9..7e88391ff3 100644
--- a/drivers/pinctrl/pinctrl.c
+++ b/drivers/pinctrl/pinctrl.c
@@ -76,7 +76,7 @@ static struct pinctrl_device *find_pinctrl(struct device_node *node)
 	return NULL;
 }
 
-static int pinctrl_config_one(struct device_node *np)
+static int pinctrl_config_one(struct device_node *for_node, struct device_node *np)
 {
 	struct pinctrl_device *pdev;
 	struct device_node *pinctrl_node = np;
@@ -89,6 +89,9 @@ static int pinctrl_config_one(struct device_node *np)
 			break;
 	}
 
+	if (pinctrl_node != for_node)
+		of_device_ensure_probed(pinctrl_node);
+
 	pdev = find_pinctrl(pinctrl_node);
 	if (pdev)
 		return pdev->ops->set_state(pdev, np);
@@ -151,7 +154,7 @@ int of_pinctrl_select_state(struct device_node *np, const char *name)
 			}
 
 			/* Parse the node */
-			ret = pinctrl_config_one(np_config);
+			ret = pinctrl_config_one(np, np_config);
 			if (ret < 0)
 				goto err;
 		}
-- 
2.29.2


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[PATCH 13/17] ARM: i.MX: esdctl: add deep-probe support

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

In case of deep-probe we have to ensure that the memory device is
available after the mem_initcall().

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-9-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/mach-imx/esdctl.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/esdctl.c b/arch/arm/mach-imx/esdctl.c
index 135a16d111..6df4008c2d 100644
--- a/arch/arm/mach-imx/esdctl.c
+++ b/arch/arm/mach-imx/esdctl.c
@@ -706,7 +706,17 @@ static struct driver_d imx_esdctl_driver = {
 	.of_compatible = DRV_OF_COMPAT(imx_esdctl_dt_ids),
 };
 
-mem_platform_driver(imx_esdctl_driver);
+static int imx_esdctl_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&imx_esdctl_driver);
+	if (ret)
+		return ret;
+
+	return of_devices_ensure_probed_by_dev_id(imx_esdctl_dt_ids);
+}
+mem_initcall(imx_esdctl_init);
 
 /*
  * The i.MX SoCs usually have two SDRAM chipselects. The following
-- 
2.29.2


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[PATCH 14/17] ARM: stm32mp: ddrctrl: add deep-probe support

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

In case of deep-probe we have to ensure that the memory device is
available after the mem_initcall().

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-10-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/mach-stm32mp/ddrctrl.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-stm32mp/ddrctrl.c b/arch/arm/mach-stm32mp/ddrctrl.c
index 646fe4401a..9687747b3b 100644
--- a/arch/arm/mach-stm32mp/ddrctrl.c
+++ b/arch/arm/mach-stm32mp/ddrctrl.c
@@ -148,4 +148,14 @@ static struct driver_d stm32mp1_ddr_driver = {
 	.of_compatible = DRV_OF_COMPAT(stm32mp1_ddr_dt_ids),
 };
 
-mem_platform_driver(stm32mp1_ddr_driver);
+static int stm32mp1_ddr_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&stm32mp1_ddr_driver);
+	if (ret)
+		return ret;
+
+	return of_devices_ensure_probed_by_dev_id(stm32mp1_ddr_dt_ids);
+}
+mem_initcall(stm32mp1_ddr_init);
-- 
2.29.2


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[PATCH 15/17] ARM: boards: mx6-sabrelite: add deep-probe support

[Sascha Hauer]

From: Marco Felsch <m.felsch@pengutronix.de>

Convert to board driver and explicitly request the required gpio
resources instead of relying on their existence based on the initcall
level.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.pengutronix.de/20201021115813.31645-11-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 .../boards/freescale-mx6-sabrelite/board.c    | 58 ++++++++++---------
 1 file changed, 32 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boards/freescale-mx6-sabrelite/board.c b/arch/arm/boards/freescale-mx6-sabrelite/board.c
index 1b39ef82c6..f6eac4c0f3 100644
--- a/arch/arm/boards/freescale-mx6-sabrelite/board.c
+++ b/arch/arm/boards/freescale-mx6-sabrelite/board.c
@@ -13,7 +13,9 @@
 #include <mach/bbu.h>
 #include <asm/armlinux.h>
 #include <generated/mach-types.h>
+#include <of.h>
 #include <partition.h>
+#include <deep-probe.h>
 #include <linux/phy.h>
 #include <asm/io.h>
 #include <asm/mmu.h>
@@ -98,10 +100,6 @@ static int sabrelite_ksz9021rn_setup(void)
 {
 	int ret;
 
-	if (!of_machine_is_compatible("fsl,imx6q-sabrelite") &&
-	    !of_machine_is_compatible("fsl,imx6dl-sabrelite"))
-		return 0;
-
 	mxc_iomux_v3_setup_multiple_pads(sabrelite_enet_gpio_pads,
 			ARRAY_SIZE(sabrelite_enet_gpio_pads));
 
@@ -118,11 +116,6 @@ static int sabrelite_ksz9021rn_setup(void)
 
 	return 0;
 }
-/*
- * Do this before the fec initializes but after our
- * gpios are available.
- */
-fs_initcall(sabrelite_ksz9021rn_setup);
 
 static void sabrelite_ehci_init(void)
 {
@@ -132,11 +125,22 @@ static void sabrelite_ehci_init(void)
 	gpio_set_value(IMX_GPIO_NR(7, 12), 1);
 }
 
-static int sabrelite_devices_init(void)
+static int sabrelite_probe(struct device_d *dev)
 {
-	if (!of_machine_is_compatible("fsl,imx6q-sabrelite") &&
-	    !of_machine_is_compatible("fsl,imx6dl-sabrelite"))
-		return 0;
+	int ret;
+
+	phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
+					   ksz9021rn_phy_fixup);
+
+	barebox_set_hostname("sabrelite");
+
+	ret = of_devices_ensure_probed_by_property("gpio-controller");
+	if (ret)
+		return ret;
+
+	ret = sabrelite_ksz9021rn_setup();
+	if (ret)
+		return ret;
 
 	sabrelite_ehci_init();
 
@@ -147,19 +151,21 @@ static int sabrelite_devices_init(void)
 
 	return 0;
 }
-device_initcall(sabrelite_devices_init);
-
-static int sabrelite_coredevices_init(void)
-{
-	if (!of_machine_is_compatible("fsl,imx6q-sabrelite") &&
-	    !of_machine_is_compatible("fsl,imx6dl-sabrelite"))
-		return 0;
+static const struct of_device_id sabrelite_match[] = {
+	{
+		.compatible = "fsl,imx6q-sabrelite",
+	}, {
+		.compatible = "fsl,imx6dl-sabrelite",
+	},
+	{ /* Sentinel */ },
+};
 
-	phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
-					   ksz9021rn_phy_fixup);
+static struct driver_d sabrelite_driver = {
+	.name = "physom-imx6",
+	.probe = sabrelite_probe,
+	.of_compatible = sabrelite_match,
+};
 
-	barebox_set_hostname("sabrelite");
+postcore_platform_driver(sabrelite_driver);
 
-	return 0;
-}
-coredevice_initcall(sabrelite_coredevices_init);
+BAREBOX_DEEP_PROBE_ENABLE(sabrelite_match);
-- 
2.29.2


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[PATCH 16/17] ARM: i.MX Phytec physom: convert to board driver

[Sascha Hauer]

Board driver is the new way for board specific fixups and the physom
board with its many compatible strings can really take profit from it,
so convert it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/boards/phytec-som-imx6/board.c | 150 ++++++++++++++++++------
 1 file changed, 117 insertions(+), 33 deletions(-)

diff --git a/arch/arm/boards/phytec-som-imx6/board.c b/arch/arm/boards/phytec-som-imx6/board.c
index bac3e8a8a1..36c4d9a78b 100644
--- a/arch/arm/boards/phytec-som-imx6/board.c
+++ b/arch/arm/boards/phytec-som-imx6/board.c
@@ -141,16 +141,26 @@ err_out:
 	return ret;
 }
 
-static int physom_imx6_devices_init(void)
+#define IS_PHYFLEX	BIT(0)
+#define IS_PHYCORE	BIT(1)
+#define IS_PHYCARD	BIT(2)
+#define IS_PHYCORE_UL	BIT(3)
+#define HAS_MMC3	BIT(4)
+#define HAS_MMC1	BIT(5)
+
+struct board_data {
+	unsigned flags;
+};
+
+static int physom_imx6_probe(struct device_d *dev)
 {
 	int ret;
 	char *environment_path, *default_environment_path;
 	char *envdev, *default_envdev;
+	const struct board_data *brd = device_get_match_data(dev);
+	unsigned flags = brd->flags;
 
-	if (of_machine_is_compatible("phytec,imx6q-pfla02")
-		|| of_machine_is_compatible("phytec,imx6dl-pfla02")
-		|| of_machine_is_compatible("phytec,imx6s-pfla02")) {
-
+	if (flags & IS_PHYFLEX) {
 		phyflex_err006282_workaround();
 
 		pfla02_module_revision = get_module_rev();
@@ -164,21 +174,14 @@ static int physom_imx6_devices_init(void)
 		imx6_bbu_internal_mmc_register_handler("mmc2",
 						"/dev/mmc2", 0);
 
-	} else if (of_machine_is_compatible("phytec,imx6q-pcaaxl3")) {
-
+	} else if (flags & IS_PHYCARD) {
 		barebox_set_hostname("phyCARD-i.MX6");
 		default_environment_path = "/chosen/environment-nand";
 		default_envdev = "NAND flash";
 
 		imx6_bbu_internal_mmc_register_handler("mmc2",
 						"/dev/mmc2", 0);
-
-	} else if (of_machine_is_compatible("phytec,imx6q-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6q-pcm058-emmc")
-		|| of_machine_is_compatible("phytec,imx6dl-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6qp-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6dl-pcm058-emmc")) {
-
+	} else if (flags & IS_PHYCORE) {
 		if (phycore_da9062_setup_buck_mode())
 			pr_err("Setting PMIC BUCK mode failed\n");
 
@@ -189,8 +192,7 @@ static int physom_imx6_devices_init(void)
 		imx6_bbu_internal_mmc_register_handler("mmc0",
 						"/dev/mmc0", 0);
 
-	} else if (of_machine_is_compatible("phytec,imx6ul-pcl063-nand")
-		|| of_machine_is_compatible("phytec,imx6ul-pcl063-emmc")) {
+	} else if (flags & IS_PHYCORE_UL) {
 		barebox_set_hostname("phyCORE-i.MX6UL");
 		default_environment_path = "/chosen/environment-nand";
 		default_envdev = "NAND flash";
@@ -201,8 +203,9 @@ static int physom_imx6_devices_init(void)
 		imx6_bbu_internal_mmc_register_handler("mmc0",
 						"/dev/mmc0", 0);
 
-	} else
-		return 0;
+	} else {
+		return -EINVAL;
+	}
 
 	switch (bootsource_get()) {
 	case BOOTSOURCE_MMC:
@@ -234,14 +237,13 @@ static int physom_imx6_devices_init(void)
 
 	pr_notice("Using environment in %s\n", envdev);
 
-	if (of_machine_is_compatible("phytec,imx6q-pcm058-emmc")
-		|| of_machine_is_compatible("phytec,imx6dl-pcm058-emmc")) {
+	if (flags & HAS_MMC3) {
 		imx6_bbu_internal_mmc_register_handler("mmc3",
 						"/dev/mmc3",
 						BBU_HANDLER_FLAG_DEFAULT);
 		imx6_bbu_internal_mmcboot_register_handler("mmc3-boot",
 						"mmc3", 0);
-	} else if (of_machine_is_compatible("phytec,imx6ul-pcl063-emmc")) {
+	} else if (flags & HAS_MMC1) {
 		imx6_bbu_internal_mmc_register_handler("mmc1",
 						"/dev/mmc1",
 						BBU_HANDLER_FLAG_DEFAULT);
@@ -254,23 +256,105 @@ static int physom_imx6_devices_init(void)
 	defaultenv_append_directory(defaultenv_physom_imx6);
 
 	/* Overwrite file /env/init/automount */
-	if (of_machine_is_compatible("phytec,imx6q-pfla02")
-		|| of_machine_is_compatible("phytec,imx6dl-pfla02")
-		|| of_machine_is_compatible("phytec,imx6s-pfla02")
-		|| of_machine_is_compatible("phytec,imx6q-pcaaxl3")) {
+	if (flags & IS_PHYCARD || flags & IS_PHYFLEX) {
 		defaultenv_append_directory(defaultenv_physom_imx6);
-	} else if (of_machine_is_compatible("phytec,imx6qp-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6q-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6q-pcm058-emmc")
-		|| of_machine_is_compatible("phytec,imx6dl-pcm058-nand")
-		|| of_machine_is_compatible("phytec,imx6dl-pcm058-emmc")) {
+	} else if (flags & IS_PHYCORE) {
 		defaultenv_append_directory(defaultenv_physom_imx6);
 		defaultenv_append_directory(defaultenv_physom_imx6_phycore);
-	} else if (of_machine_is_compatible("phytec,imx6ul-pcl063-nand")
-		|| of_machine_is_compatible("phytec,imx6ul-pcl063-emmc")) {
+	} else if (flags & IS_PHYCORE_UL) {
 		defaultenv_append_directory(defaultenv_physom_imx6ul_phycore);
 	}
 
 	return 0;
 }
-device_initcall(physom_imx6_devices_init);
+
+static struct board_data imx6q_pfla02 = {
+	.flags = IS_PHYFLEX,
+};
+
+static struct board_data imx6dl_pfla02 = {
+	.flags = IS_PHYFLEX,
+};
+
+static struct board_data imx6s_pfla02 = {
+	.flags = IS_PHYFLEX,
+};
+
+static struct board_data imx6q_pcaaxl3 = {
+	.flags = IS_PHYCARD,
+};
+
+static struct board_data imx6q_pcm058_nand = {
+	.flags = IS_PHYCORE,
+};
+
+static struct board_data imx6q_pcm058_emmc = {
+	.flags = IS_PHYCORE | HAS_MMC3,
+};
+
+static struct board_data imx6dl_pcm058_nand = {
+	.flags = IS_PHYCORE,
+};
+
+static struct board_data imx6qp_pcm058_nand = {
+	.flags = IS_PHYCORE,
+};
+
+static struct board_data imx6dl_pcm058_emmc = {
+	.flags = IS_PHYCORE | HAS_MMC3,
+};
+
+static struct board_data imx6ul_pcl063_nand = {
+	.flags = IS_PHYCORE_UL,
+};
+
+static struct board_data imx6ul_pcl063_emmc = {
+	.flags = IS_PHYCORE_UL | HAS_MMC1,
+};
+
+
+static const struct of_device_id physom_imx6_match[] = {
+	{
+		.compatible = "phytec,imx6q-pfla02",
+		.data = &imx6q_pfla02,
+	}, {
+		.compatible = "phytec,imx6dl-pfla02",
+		.data = &imx6dl_pfla02,
+	}, {
+		.compatible = "phytec,imx6s-pfla02",
+		.data = &imx6s_pfla02,
+	}, {
+		.compatible = "phytec,imx6q-pcaaxl3",
+		.data = &imx6q_pcaaxl3,
+	}, {
+		.compatible = "phytec,imx6q-pcm058-nand",
+		.data = &imx6q_pcm058_nand,
+	}, {
+		.compatible = "phytec,imx6q-pcm058-emmc",
+		.data = &imx6q_pcm058_emmc,
+	}, {
+		.compatible = "phytec,imx6dl-pcm058-nand",
+		.data = &imx6dl_pcm058_nand,
+	}, {
+		.compatible = "phytec,imx6qp-pcm058-nand",
+		.data = &imx6qp_pcm058_nand,
+	}, {
+		.compatible = "phytec,imx6dl-pcm058-emmc",
+		.data = &imx6dl_pcm058_emmc,
+	}, {
+		.compatible = "phytec,imx6ul-pcl063-nand",
+		.data = &imx6ul_pcl063_nand,
+	}, {
+		.compatible = "phytec,imx6ul-pcl063-emmc",
+		.data = &imx6ul_pcl063_emmc,
+	},
+	{ /* Sentinel */ },
+};
+
+static struct driver_d physom_imx6_driver = {
+	.name = "physom-imx6",
+	.probe = physom_imx6_probe,
+	.of_compatible = physom_imx6_match,
+};
+
+postcore_platform_driver(physom_imx6_driver);
-- 
2.29.2


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[PATCH 17/17] ARM: i.MX Phytec physom: Add deep-probe support

[Sascha Hauer]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/boards/phytec-som-imx6/board.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/boards/phytec-som-imx6/board.c b/arch/arm/boards/phytec-som-imx6/board.c
index 36c4d9a78b..1e515a093a 100644
--- a/arch/arm/boards/phytec-som-imx6/board.c
+++ b/arch/arm/boards/phytec-som-imx6/board.c
@@ -14,6 +14,7 @@
 #include <gpio.h>
 #include <init.h>
 #include <of.h>
+#include <deep-probe.h>
 #include <i2c/i2c.h>
 #include <mach/bbu.h>
 #include <platform_data/eth-fec.h>
@@ -110,6 +111,10 @@ static int phycore_da9062_setup_buck_mode(void)
 	if (!pmic_np)
 		return -ENODEV;
 
+	ret = of_device_ensure_probed(pmic_np);
+	if (ret)
+		return ret;
+
 	adapter = of_find_i2c_adapter_by_node(pmic_np->parent);
 	if (!adapter)
 		return -ENODEV;
@@ -161,6 +166,10 @@ static int physom_imx6_probe(struct device_d *dev)
 	unsigned flags = brd->flags;
 
 	if (flags & IS_PHYFLEX) {
+		ret = of_devices_ensure_probed_by_property("gpio-controller");
+		if (ret)
+			return ret;
+
 		phyflex_err006282_workaround();
 
 		pfla02_module_revision = get_module_rev();
@@ -358,3 +367,5 @@ static struct driver_d physom_imx6_driver = {
 };
 
 postcore_platform_driver(physom_imx6_driver);
+
+BAREBOX_DEEP_PROBE_ENABLE(physom_imx6_match);
-- 
2.29.2


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