linux-kernel - [PATCH v2 1/4] gpiolib: provide gpio_device_find_by

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Message-Id: <20231011202638.372382-2-andriy.shevchenko@linux.intel.com>
Date:   Wed, 11 Oct 2023 23:26:35 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Dipen Patel <dipenp@...dia.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-tegra@...r.kernel.org
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: [PATCH v2 1/4] gpiolib: provide gpio_device_find_by_fwnode()

One of the ways of looking up GPIO devices is using their fwnode.
Provide a helper for that to avoid every user implementing their
own matching function.

Reviewed-by: Dipen Patel <dipenp@...dia.com>
Tested-by: Dipen Patel <dipenp@...dia.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Link: https://lore.kernel.org/r/20231010151709.4104747-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/gpio/gpiolib.c      | 20 ++++++++++++++++++++
 include/linux/gpio/driver.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 7b4d12b714a3..31c06a32cb8a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1142,6 +1142,26 @@ struct gpio_device *gpio_device_find_by_label(const char *label)
 }
 EXPORT_SYMBOL_GPL(gpio_device_find_by_label);
 
+static int gpio_chip_match_by_fwnode(struct gpio_chip *gc, void *fwnode)
+{
+	return device_match_fwnode(&gc->gpiodev->dev, fwnode);
+}
+
+/**
+ * gpio_device_find_by_fwnode() - wrapper around gpio_device_find() finding
+ *                                the GPIO device by its fwnode
+ * @fwnode: Firmware node to lookup
+ *
+ * Returns:
+ * Reference to the GPIO device or NULL. Reference must be released with
+ * gpio_device_put().
+ */
+struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode)
+{
+	return gpio_device_find((void *)fwnode, gpio_chip_match_by_fwnode);
+}
+EXPORT_SYMBOL_GPL(gpio_device_find_by_fwnode);
+
 /**
  * gpio_device_get() - Increase the reference count of this GPIO device
  * @gdev: GPIO device to increase the refcount for
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index f8ad7f40100c..ae4162d3f1d3 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -611,6 +611,7 @@ struct gpio_chip *gpiochip_find(void *data,
 struct gpio_device *gpio_device_find(void *data,
 				int (*match)(struct gpio_chip *gc, void *data));
 struct gpio_device *gpio_device_find_by_label(const char *label);
+struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode);
 
 struct gpio_device *gpio_device_get(struct gpio_device *gdev);
 void gpio_device_put(struct gpio_device *gdev);
-- 
2.40.0.1.gaa8946217a0b