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reset: gpio: convert the driver to using the auxiliary bus

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As the reset-gpio devices are purely virtual and never instantiated from
real firmware nodes, let's convert the driver to using the - more
fitting - auxiliary bus.

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Bartosz Golaszewski
2025-11-20 14:24:03 +01:00
committed by Philipp Zabel
parent 46dae84a90
commit 109ce747ac
3 changed files with 17 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/reset/Kconfig
View File

@@ -89,6 +89,7 @@ config RESET_EYEQ
config RESET_GPIO
tristate "GPIO reset controller"
depends on GPIOLIB
select AUXILIARY_BUS
help
This enables a generic reset controller for resets attached via
GPIOs. Typically for OF platforms this driver expects "reset-gpios"

14
drivers/reset/core.c
View File

@@ -7,6 +7,7 @@
#include <linux/acpi.h>
#include <linux/atomic.h>
#include <linux/auxiliary_bus.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/err.h>
@@ -18,7 +19,6 @@
#include <linux/kref.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
@@ -882,7 +882,7 @@ static int __reset_add_reset_gpio_lookup(struct gpio_device *gdev, int id,
if (!lookup)
return -ENOMEM;
lookup->dev_id = kasprintf(GFP_KERNEL, "reset-gpio.%d", id);
lookup->dev_id = kasprintf(GFP_KERNEL, "reset.gpio.%d", id);
if (!lookup->dev_id)
return -ENOMEM;
@@ -903,7 +903,7 @@ static int __reset_add_reset_gpio_lookup(struct gpio_device *gdev, int id,
static int __reset_add_reset_gpio_device(const struct of_phandle_args *args)
{
struct reset_gpio_lookup *rgpio_dev;
struct platform_device *pdev;
struct auxiliary_device *adev;
int id, ret;
/*
@@ -959,11 +959,9 @@ static int __reset_add_reset_gpio_device(const struct of_phandle_args *args)
* Hold reference as long as rgpio_dev memory is valid.
*/
of_node_get(rgpio_dev->of_args.np);
pdev = platform_device_register_data(gpio_device_to_device(gdev),
"reset-gpio", id,
&rgpio_dev->of_args,
sizeof(rgpio_dev->of_args));
ret = PTR_ERR_OR_ZERO(pdev);
adev = auxiliary_device_create(gpio_device_to_device(gdev), "reset",
"gpio", &rgpio_dev->of_args, id);
ret = PTR_ERR_OR_ZERO(adev);
if (ret)
goto err_put;

19
drivers/reset/reset-gpio.c
View File

@@ -1,10 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/auxiliary_bus.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
struct reset_gpio_priv {
@@ -61,9 +61,10 @@ static void reset_gpio_of_node_put(void *data)
of_node_put(data);
}
static int reset_gpio_probe(struct platform_device *pdev)
static int reset_gpio_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct device *dev = &pdev->dev;
struct device *dev = &adev->dev;
struct of_phandle_args *platdata = dev_get_platdata(dev);
struct reset_gpio_priv *priv;
int ret;
@@ -75,7 +76,7 @@ static int reset_gpio_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, &priv->rc);
auxiliary_set_drvdata(adev, &priv->rc);
priv->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(priv->reset))
@@ -99,20 +100,20 @@ static int reset_gpio_probe(struct platform_device *pdev)
return devm_reset_controller_register(dev, &priv->rc);
}
static const struct platform_device_id reset_gpio_ids[] = {
{ .name = "reset-gpio", },
static const struct auxiliary_device_id reset_gpio_ids[] = {
{ .name = "reset.gpio" },
{}
};
MODULE_DEVICE_TABLE(platform, reset_gpio_ids);
MODULE_DEVICE_TABLE(auxiliary, reset_gpio_ids);
static struct platform_driver reset_gpio_driver = {
static struct auxiliary_driver reset_gpio_driver = {
.probe = reset_gpio_probe,
.id_table = reset_gpio_ids,
.driver = {
.name = "reset-gpio",
},
};
module_platform_driver(reset_gpio_driver);
module_auxiliary_driver(reset_gpio_driver);
MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>");
MODULE_DESCRIPTION("Generic GPIO reset driver");