linux-kernel - [PATCH 1/3] gpiolib: provide gpio_device_to

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Date:   Wed, 11 Oct 2023 15:02:02 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy@...nel.org>,
        Peter Korsgaard <peter.korsgaard@...co.com>,
        Peter Rosin <peda@...ntia.se>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 1/3] gpiolib: provide gpio_device_to_device()

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

There are users in the kernel who need to retrieve the address of the
struct device backing the GPIO device. Currently they needlessly poke in
the internals of GPIOLIB. Add a dedicated getter function.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib.c      | 17 +++++++++++++++++
 include/linux/gpio/driver.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 191f9c87b4d0..ca2b5b424284 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1169,6 +1169,23 @@ void gpio_device_put(struct gpio_device *gdev)
 }
 EXPORT_SYMBOL_GPL(gpio_device_put);
 
+/**
+ * gpio_device_to_device() - Retrieve the address of the underlying struct
+ *                           device.
+ * @gdev: GPIO device for which to return the address.
+ *
+ * This does not increase the reference count of the GPIO device nor the
+ * underlying struct device.
+ *
+ * Returns:
+ * Address of struct device backing this GPIO device.
+ */
+struct device *gpio_device_to_device(struct gpio_device *gdev)
+{
+	return &gdev->dev;
+}
+EXPORT_SYMBOL_GPL(gpio_device_to_device);
+
 #ifdef CONFIG_GPIOLIB_IRQCHIP
 
 /*
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index f8ad7f40100c..0484bf90b25d 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -618,6 +618,8 @@ void gpio_device_put(struct gpio_device *gdev);
 DEFINE_FREE(gpio_device_put, struct gpio_device *,
 	    if (IS_ERR_OR_NULL(_T)) gpio_device_put(_T));
 
+struct device *gpio_device_to_device(struct gpio_device *gdev);
+
 bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
 int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
 void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
-- 
2.39.2