[PATCH v1 1/5] common: add $global.serial_number with device tree fixup

[PATCH v1 1/5] common: add $global.serial_number with device tree fixup

[Oleksij Rempel]

From: Ahmad Fatoum <a.fatoum@pengutronix.de>

This new variable can be set by boards from C code or from the
environment to change the serial number fixed up into the kernel device
tree.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 common/Kconfig   |  5 +++++
 common/misc.c    | 16 ++++++++++++++++
 common/oftree.c  |  9 +++++++++
 include/common.h |  3 +++
 4 files changed, 33 insertions(+)

diff --git a/common/Kconfig b/common/Kconfig
index f7a6a96e87..d08302a573 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1066,6 +1066,11 @@ config MACHINE_ID
 	  Note: if no hashable information is available no machine id will be passed
 	  to the kernel.
 
+config SERIAL_NUMBER_FIXUP
+	bool "fix up board serial number"
+	help
+	  fixup serial number supplied by board code info device tree
+
 config SYSTEMD_OF_WATCHDOG
 	bool "inform devicetree-enabled kernel of used watchdog"
 	depends on WATCHDOG && OFTREE && FLEXIBLE_BOOTARGS
diff --git a/common/misc.c b/common/misc.c
index 226635f0d4..3b3bc05bfd 100644
--- a/common/misc.c
+++ b/common/misc.c
@@ -149,6 +149,7 @@ EXPORT_SYMBOL(barebox_get_model);
 BAREBOX_MAGICVAR(global.model, "Product name of this hardware");
 
 static char *hostname;
+static char *serial_number;
 
 /*
  * The hostname is supposed to be the shortname of a board. It should
@@ -179,6 +180,21 @@ EXPORT_SYMBOL(barebox_set_hostname_no_overwrite);
 BAREBOX_MAGICVAR(global.hostname,
 		"shortname of the board. Also used as hostname for DHCP requests");
 
+void barebox_set_serial_number(const char *__serial_number)
+{
+	globalvar_add_simple_string("serial_number", &serial_number);
+
+	free(serial_number);
+	serial_number = xstrdup(__serial_number);
+}
+
+const char *barebox_get_serial_number(void)
+{
+	return serial_number;
+}
+
+BAREBOX_MAGICVAR(global.serial_number, "Board serial number");
+
 void __noreturn panic(const char *fmt, ...)
 {
 	va_list args;
diff --git a/common/oftree.c b/common/oftree.c
index bce0ff09d6..c6d75055cc 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -207,6 +207,15 @@ static int of_fixup_bootargs(struct device_node *root, void *unused)
 	int instance = reset_source_get_instance();
 	struct device_d *dev;
 
+	if (IS_ENABLED(CONFIG_SERIAL_NUMBER_FIXUP)) {
+		const char *serialno;
+
+		serialno = getenv("global.serial_number");
+		if (serialno)
+			of_property_write_string(root, "serial-number", serialno);
+
+	}
+
 	node = of_create_node(root, "/chosen");
 	if (!node)
 		return -ENOMEM;
diff --git a/include/common.h b/include/common.h
index 4167d4676e..967502a7ab 100644
--- a/include/common.h
+++ b/include/common.h
@@ -126,4 +126,7 @@ const char *barebox_get_hostname(void);
 void barebox_set_hostname(const char *);
 void barebox_set_hostname_no_overwrite(const char *);
 
+const char *barebox_get_serial_number(void);
+void barebox_set_serial_number(const char *);
+
 #endif	/* __COMMON_H_ */
-- 
2.30.2


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[PATCH v1 2/5] ARM: boards: protonic-imx6: make use of barebox_set_serial_number()

[Oleksij Rempel]

Replace board specific serial-number fixup with common
barebox_set_serial_number().

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/arm/boards/protonic-imx6/board.c | 20 +-------------------
 arch/arm/mach-imx/Kconfig             |  1 +
 2 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/arch/arm/boards/protonic-imx6/board.c b/arch/arm/boards/protonic-imx6/board.c
index 52cf39917a..0fadd148b4 100644
--- a/arch/arm/boards/protonic-imx6/board.c
+++ b/arch/arm/boards/protonic-imx6/board.c
@@ -196,30 +196,12 @@ static int prt_imx6_set_mac(struct prt_imx6_priv *priv,
 	return 0;
 }
 
-static int prt_of_fixup_serial(struct device_node *dstroot, void *arg)
-{
-	struct device_node *srcroot = arg;
-	const char *ser;
-	int len;
-
-	ser = of_get_property(srcroot, "serial-number", &len);
-	return of_set_property(dstroot, "serial-number", ser, len, 1);
-}
-
-static void prt_oftree_fixup_serial(const char *serial)
-{
-	struct device_node *root = of_get_root_node();
-
-	of_set_property(root, "serial-number", serial, strlen(serial) + 1, 1);
-	of_register_fixup(prt_of_fixup_serial, root);
-}
-
 static int prt_imx6_set_serial(struct prt_imx6_priv *priv,
 			       struct prti6q_rfid_contents *rfid)
 {
 	rfid->serial[9] = 0; /* Failsafe */
 	dev_info(priv->dev, "Serial number: %s\n", rfid->serial);
-	prt_oftree_fixup_serial(rfid->serial);
+	barebox_set_serial_number(rfid->serial);
 
 	return 0;
 }
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 6b962dcf7e..ee313a1502 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -350,6 +350,7 @@ config MACH_PROTONIC_IMX6
 	select ARCH_IMX6
 	select ARCH_IMX6UL
 	select ARM_USE_COMPRESSED_DTB
+	select SERIAL_NUMBER_FIXUP
 
 config MACH_PROTONIC_IMX8M
 	bool "Protonic-Holland i.MX8Mx based boards"
-- 
2.30.2


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[PATCH v1 3/5] of: add generic of_fixup_machine_compatible()

[Oleksij Rempel]

Add generic function to extend/fixup machine compatible.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 common/oftree.c | 30 ++++++++++++++++++++++++++++++
 include/of.h    |  6 ++++++
 2 files changed, 36 insertions(+)

diff --git a/common/oftree.c b/common/oftree.c
index c6d75055cc..0a66882946 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -487,3 +487,33 @@ int of_autoenable_i2c_by_component(char *path)
 
 	return ret;
 }
+
+int of_fixup_machine_compatible(struct device_node *root, const char *compat)
+{
+	int cclen = 0, clen = strlen(compat) + 1;
+	const char *curcompat;
+	void *buf;
+
+	if (!root) {
+		root = of_get_root_node();
+		if (!root)
+			return -ENODEV;
+	}
+
+	curcompat = of_get_property(root, "compatible", &cclen);
+
+	buf = xzalloc(cclen + clen);
+
+	memcpy(buf, compat, clen);
+	memcpy(buf + clen, curcompat, cclen);
+
+	/*
+	 * Prepend the compatible from board entry to the machine compatible.
+	 * Used to match bootspec entries against it.
+	 */
+	of_set_property(root, "compatible", buf, cclen + clen, true);
+
+	free(buf);
+
+	return 0;
+}
diff --git a/include/of.h b/include/of.h
index cf9950e9b3..9f514c5ec2 100644
--- a/include/of.h
+++ b/include/of.h
@@ -316,6 +316,7 @@ struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
 		const char *str);
 int of_autoenable_device_by_path(char *path);
 int of_autoenable_i2c_by_component(char *path);
+int of_fixup_machine_compatible(struct device_node *root, const char *compat);
 #else
 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
 {
@@ -834,6 +835,11 @@ static inline int of_autoenable_i2c_by_component(char *path)
 	return -ENODEV;
 }
 
+static int of_fixup_machine_compatible(struct device_node *root,
+				       const char *compat)
+{
+	return -ENODEV;
+}
 
 #endif
 
-- 
2.30.2


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Re: [PATCH v1 3/5] of: add generic of_fixup_machine_compatible()

[Ahmad Fatoum]

On 27.04.22 09:37, Oleksij Rempel wrote:
> Add generic function to extend/fixup machine compatible.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Cc += Rouven, who had a similar use case

> ---
>  common/oftree.c | 30 ++++++++++++++++++++++++++++++
>  include/of.h    |  6 ++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/common/oftree.c b/common/oftree.c
> index c6d75055cc..0a66882946 100644
> --- a/common/oftree.c
> +++ b/common/oftree.c
> @@ -487,3 +487,33 @@ int of_autoenable_i2c_by_component(char *path)
>  
>  	return ret;
>  }
> +
> +int of_fixup_machine_compatible(struct device_node *root, const char *compat)
> +{
> +	int cclen = 0, clen = strlen(compat) + 1;
> +	const char *curcompat;
> +	void *buf;
> +
> +	if (!root) {
> +		root = of_get_root_node();
> +		if (!root)
> +			return -ENODEV;
> +	}
> +
> +	curcompat = of_get_property(root, "compatible", &cclen);
> +
> +	buf = xzalloc(cclen + clen);
> +
> +	memcpy(buf, compat, clen);

add an 

if (curcompat)

> +	memcpy(buf + clen, curcompat, cclen);
> +
> +	/*
> +	 * Prepend the compatible from board entry to the machine compatible.
> +	 * Used to match bootspec entries against it.
> +	 */
> +	of_set_property(root, "compatible", buf, cclen + clen, true);

That way it should work even if there was no compatible property to begin with.


If you feel like it, you could add a new $global.of_compatible to make this
easier to test. :))

> +
> +	free(buf);
> +
> +	return 0;
> +}
> diff --git a/include/of.h b/include/of.h
> index cf9950e9b3..9f514c5ec2 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -316,6 +316,7 @@ struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
>  		const char *str);
>  int of_autoenable_device_by_path(char *path);
>  int of_autoenable_i2c_by_component(char *path);
> +int of_fixup_machine_compatible(struct device_node *root, const char *compat);
>  #else
>  static inline bool of_node_name_eq(const struct device_node *np, const char *name)
>  {
> @@ -834,6 +835,11 @@ static inline int of_autoenable_i2c_by_component(char *path)
>  	return -ENODEV;
>  }
>  
> +static int of_fixup_machine_compatible(struct device_node *root,
> +				       const char *compat)
> +{
> +	return -ENODEV;
> +}
>  
>  #endif
>  


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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[PATCH v1 4/5] ARM: boards: skov-imx6: make use of of_fixup_machine_compatible()

[Oleksij Rempel]

Replace board specific fixup_machine_compatible() with generic
of_fixup_machine_compatible()

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/arm/boards/skov-imx6/board.c | 40 +++----------------------------
 1 file changed, 3 insertions(+), 37 deletions(-)

diff --git a/arch/arm/boards/skov-imx6/board.c b/arch/arm/boards/skov-imx6/board.c
index 2702bc1de9..53c213f33b 100644
--- a/arch/arm/boards/skov-imx6/board.c
+++ b/arch/arm/boards/skov-imx6/board.c
@@ -312,55 +312,21 @@ static int skov_board_no = -1;
 static bool skov_have_switch = true;
 static const char *no_switch_suffix = "-noswitch";
 
-static void fixup_machine_compatible(const char *compat,
-				     struct device_node *root)
-{
-	int cclen = 0, clen = strlen(compat) + 1;
-	const char *curcompat;
-	void *buf;
-
-	if (!root) {
-		root = of_get_root_node();
-		if (!root)
-			return;
-	}
-
-	curcompat = of_get_property(root, "compatible", &cclen);
-
-	buf = xzalloc(cclen + clen);
-
-	memcpy(buf, compat, clen);
-	memcpy(buf + clen, curcompat, cclen);
-
-	/*
-	 * Prepend the compatible from board entry to the machine compatible.
-	 * Used to match bootspec entries against it.
-	 */
-	of_set_property(root, "compatible", buf, cclen + clen, true);
-
-	free(buf);
-}
-
 static void fixup_noswitch_machine_compatible(struct device_node *root)
 {
 	const char *compat = imx6_variants[skov_board_no].dts_compatible;
 	const char *generic = "skov,imx6";
-	size_t size, size_generic;
 	char *buf;
 
-	size = strlen(compat) + strlen(no_switch_suffix) + 1;
-	size_generic = strlen(generic) + strlen(no_switch_suffix) + 1;
-	size = max(size, size_generic);
-
 	/* add generic compatible, so systemd&co can make right decisions */
 	buf = xasprintf("%s%s", generic, no_switch_suffix);
-	fixup_machine_compatible(buf, root);
+	of_fixup_machine_compatible(root, buf);
 
 	/* add specific compatible as fallback, in case this board has new
 	 * challenges.
 	 */
 	buf = xasprintf("%s%s", compat, no_switch_suffix);
-	fixup_machine_compatible(buf, root);
+	of_fixup_machine_compatible(root, buf);
 
 	free(buf);
 }
@@ -648,7 +614,7 @@ static int skov_imx6_probe(struct device_d *dev)
 	globalvar_add_simple("board.dts", variant->dts_compatible);
 	globalvar_add_simple("board.display", variant->display ?: NULL);
 
-	fixup_machine_compatible(variant->dts_compatible, NULL);
+	of_fixup_machine_compatible(NULL, variant->dts_compatible);
 
 	skov_init_board(variant);
 
-- 
2.30.2


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[PATCH v1 5/5] ARM: boards: protonic-imx6: add HW revision specific machine compatible

[Oleksij Rempel]

Currently we use generic/pinned machine compatible for different HW
revisions. With this patch we extend this compatible string with HW
revision specific.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/arm/boards/protonic-imx6/board.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boards/protonic-imx6/board.c b/arch/arm/boards/protonic-imx6/board.c
index 0fadd148b4..1a1e5540ee 100644
--- a/arch/arm/boards/protonic-imx6/board.c
+++ b/arch/arm/boards/protonic-imx6/board.c
@@ -85,6 +85,7 @@ struct prt_imx6_priv {
 	const struct prt_machine_data *dcfg;
 	unsigned int hw_id;
 	unsigned int hw_rev;
+	const char *compatible;
 	const char *name;
 	unsigned int usb_delay;
 	unsigned int no_usb_check;
@@ -126,6 +127,20 @@ static const struct gpio prt_imx6_kvg_gpios[] = {
 	},
 };
 
+static int prt_of_fixup_hwrev(struct device_node *dstroot, void *arg)
+{
+	struct prt_imx6_priv *priv = prt_priv;
+	char *buf;
+
+	buf = xasprintf("%s,model:%u,rev:%u", priv->compatible, priv->hw_id,
+			priv->hw_rev);
+	of_fixup_machine_compatible(dstroot, buf);
+
+	free(buf);
+
+	return 0;
+}
+
 static int prt_imx6_read_rfid(struct prt_imx6_priv *priv, void *buf,
 			      size_t size)
 {
@@ -797,7 +812,7 @@ exit_get_dcfg:
 static int prt_imx6_probe(struct device_d *dev)
 {
 	struct prt_imx6_priv *priv;
-	const char *name, *ptr;
+	const char *ptr;
 	struct param_d *p;
 	int ret;
 
@@ -806,9 +821,9 @@ static int prt_imx6_probe(struct device_d *dev)
 		return -ENOMEM;
 
 	priv->dev = dev;
-	name = of_device_get_match_compatible(priv->dev);
-	ptr = strchr(name, ',');
-	priv->name =  ptr ? ptr + 1 : name;
+	priv->compatible = of_device_get_match_compatible(priv->dev);
+	ptr = strchr(priv->compatible, ',');
+	priv->name =  ptr ? ptr + 1 : priv->compatible;
 
 	pr_info("Detected machine type: %s\n", priv->name);
 
@@ -841,6 +856,8 @@ static int prt_imx6_probe(struct device_d *dev)
 
 	prt_priv = priv;
 
+	of_register_fixup(prt_of_fixup_hwrev, NULL);
+
 	return 0;
 free_priv:
 	kfree(priv);
-- 
2.30.2


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Re: [PATCH v1 5/5] ARM: boards: protonic-imx6: add HW revision specific machine compatible

[Ahmad Fatoum]

On 27.04.22 09:37, Oleksij Rempel wrote:
> Currently we use generic/pinned machine compatible for different HW
> revisions. With this patch we extend this compatible string with HW
> revision specific.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  arch/arm/boards/protonic-imx6/board.c | 25 +++++++++++++++++++++----
>  1 file changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boards/protonic-imx6/board.c b/arch/arm/boards/protonic-imx6/board.c
> index 0fadd148b4..1a1e5540ee 100644
> --- a/arch/arm/boards/protonic-imx6/board.c
> +++ b/arch/arm/boards/protonic-imx6/board.c
> @@ -85,6 +85,7 @@ struct prt_imx6_priv {
>  	const struct prt_machine_data *dcfg;
>  	unsigned int hw_id;
>  	unsigned int hw_rev;
> +	const char *compatible;
>  	const char *name;
>  	unsigned int usb_delay;
>  	unsigned int no_usb_check;
> @@ -126,6 +127,20 @@ static const struct gpio prt_imx6_kvg_gpios[] = {
>  	},
>  };
>  
> +static int prt_of_fixup_hwrev(struct device_node *dstroot, void *arg)
> +{
> +	struct prt_imx6_priv *priv = prt_priv;
> +	char *buf;
> +
> +	buf = xasprintf("%s,model:%u,rev:%u", priv->compatible, priv->hw_id,
> +			priv->hw_rev);

: is not a valid character for device tree property names.
(https://github.com/devicetree-org/devicetree-specification/releases/download/v0.4-rc1/devicetree-specification-v0.4-rc1.pdf
 Table 2.2)

While barebox might not mind, it's better you stick to the standard
character set.

> +	of_fixup_machine_compatible(dstroot, buf);
> +
> +	free(buf);
> +
> +	return 0;
> +}
> +
>  static int prt_imx6_read_rfid(struct prt_imx6_priv *priv, void *buf,
>  			      size_t size)
>  {
> @@ -797,7 +812,7 @@ exit_get_dcfg:
>  static int prt_imx6_probe(struct device_d *dev)
>  {
>  	struct prt_imx6_priv *priv;
> -	const char *name, *ptr;
> +	const char *ptr;
>  	struct param_d *p;
>  	int ret;
>  
> @@ -806,9 +821,9 @@ static int prt_imx6_probe(struct device_d *dev)
>  		return -ENOMEM;
>  
>  	priv->dev = dev;
> -	name = of_device_get_match_compatible(priv->dev);
> -	ptr = strchr(name, ',');
> -	priv->name =  ptr ? ptr + 1 : name;
> +	priv->compatible = of_device_get_match_compatible(priv->dev);
> +	ptr = strchr(priv->compatible, ',');
> +	priv->name =  ptr ? ptr + 1 : priv->compatible;

Could you reuse of_get_machine_compatible() here?

>  
>  	pr_info("Detected machine type: %s\n", priv->name);
>  
> @@ -841,6 +856,8 @@ static int prt_imx6_probe(struct device_d *dev)
>  
>  	prt_priv = priv;
>  
> +	of_register_fixup(prt_of_fixup_hwrev, NULL);
> +
>  	return 0;
>  free_priv:
>  	kfree(priv);


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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