mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 19/19] of: Add dummy driver
Date: Fri, 25 Jun 2021 09:25:40 +0200	[thread overview]
Message-ID: <20210625072540.32717-20-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20210625072540.32717-1-s.hauer@pengutronix.de>

With deep probe support we decide that a device for a new device node is
available when the device has a driver. It sometimes happens that a
consumer of a device node doesn't point to the node to which the driver
is attached to, but instead a subnode, like this:

	usb2phy0: usb2-phy@fe8a0000 {
		compatible = "rockchip,rk3568-usb2phy";

		u2phy0_host: host-port {
			status = "disabled";
		};
	};

	usbhost_dwc3: dwc3@fd000000 {
		compatible = "snps,dwc3";
		phys = <&u2phy0_host>;
		phy-names = "usb2-phy";
	};

of_device_ensure_probed() would now expect a driver for the &u2phy0_host
node, but the driver is attached to the &usb2phy0 node. This patch adds
of_platform_device_dummy_drv() which can be used in such situations. When
called on the &u2phy0_host it will attach a dummy driver to it so that
deep probe is happy.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/platform.c | 9 +++++++++
 include/of.h          | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index bc0477be1d..e3e8227b8c 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -169,6 +169,15 @@ struct device_d *of_platform_device_create(struct device_node *np,
 	return NULL;
 }
 
+struct driver_d dummy_driver = {
+	.name = "dummy-driver",
+};
+
+void of_platform_device_dummy_drv(struct device_d *dev)
+{
+	dev->driver = &dummy_driver;
+}
+
 /**
  * of_device_enable_and_register - Enable and register device
  * @np: pointer to node to enable create device for
diff --git a/include/of.h b/include/of.h
index 98de9d8480..6f1ec94e7e 100644
--- a/include/of.h
+++ b/include/of.h
@@ -268,6 +268,7 @@ extern int barebox_register_fdt(const void *dtb);
 
 extern struct device_d *of_platform_device_create(struct device_node *np,
 						struct device_d *parent);
+extern void of_platform_device_dummy_drv(struct device_d *dev);
 extern int of_platform_populate(struct device_node *root,
 				const struct of_device_id *matches,
 				struct device_d *parent);
@@ -365,6 +366,10 @@ static inline struct device_d *of_platform_device_create(struct device_node *np,
 	return NULL;
 }
 
+static inline void of_platform_device_dummy_drv(struct device_d *dev)
+{
+}
+
 static inline int of_device_ensure_probed(struct device_node *np)
 {
 	return 0;
-- 
2.29.2


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox


      parent reply	other threads:[~2021-06-25  7:46 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25  7:25 [PATCH v6 00/19] barebox deep probe support Sascha Hauer
2021-06-25  7:25 ` [PATCH 01/19] imx53: remove unused imx53_add_nand Sascha Hauer
2021-06-25  7:25 ` [PATCH 02/19] of: platform: remove check of already added devices Sascha Hauer
2021-06-25  7:25 ` [PATCH 03/19] of: platform: Keep track of populated platform devices Sascha Hauer
2021-06-25  7:25 ` [PATCH 04/19] of: base: move memory init from DT to initcall Sascha Hauer
2021-06-25  7:25 ` [PATCH 05/19] of: base: move clock init from of_probe() to barebox_register_of() Sascha Hauer
2021-06-25  7:25 ` [PATCH 06/19] of: Set of_chosen and of_model earlier Sascha Hauer
2021-06-25  7:25 ` [PATCH 07/19] of: implement of_get_stdoutpath() Sascha Hauer
2021-06-25  7:25 ` [PATCH 08/19] initcall: add of_populate_initcall Sascha Hauer
2021-06-25  7:25 ` [PATCH 09/19] common: add initial barebox deep-probe support Sascha Hauer
2021-06-25  7:25 ` [PATCH 10/19] pinctrl: Find controller node first Sascha Hauer
2021-06-25  7:25 ` [PATCH 11/19] common: Explicitly probe consoles earlier with deep probe Sascha Hauer
2021-06-25  7:25 ` [PATCH 12/19] pinctrl: Add deep probe support Sascha Hauer
2021-06-25  7:25 ` [PATCH 13/19] phy: " Sascha Hauer
2021-06-25  7:25 ` [PATCH 14/19] ARM: i.MX: esdctl: add deep-probe support Sascha Hauer
2021-06-25  7:25 ` [PATCH 15/19] ARM: stm32mp: ddrctrl: " Sascha Hauer
2021-06-25  7:25 ` [PATCH 16/19] ARM: boards: mx6-sabrelite: " Sascha Hauer
2021-06-25  7:25 ` [PATCH 17/19] ARM: i.MX Phytec physom: convert to board driver Sascha Hauer
2021-06-25  7:25 ` [PATCH 18/19] ARM: i.MX Phytec physom: Add deep-probe support Sascha Hauer
2021-06-25  7:25 ` Sascha Hauer [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210625072540.32717-20-s.hauer@pengutronix.de \
    --to=s.hauer@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    --subject='Re: [PATCH 19/19] of: Add dummy driver' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox