linux-kernel - [PATCH 2/3] gpio: export gpiod

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Message-Id: <20251016-aspeed-gpiolib-include-v1-2-31201c06d124@linaro.org>
Date: Thu, 16 Oct 2025 11:09:26 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Joel Stanley <joel@....id.au>, 
 Andrew Jeffery <andrew@...econstruct.com.au>, 
 Kent Gibson <warthog618@...il.com>
Cc: linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 2/3] gpio: export gpiod_hwgpio()

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

Reading the GPIO hardware number from a descriptor is a valid use-case
outside of the GPIO core. Export the symbol to consumers of GPIO
descriptors.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib.c        | 13 +++++++++++++
 drivers/gpio/gpiolib.h        |  8 --------
 include/linux/gpio/consumer.h |  2 ++
 3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 5a450dac8f3acea3e381b09767b9fe9c9dadc2f7..a81981336b36db49d899634feafcd9bc25edf96f 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -235,6 +235,19 @@ int desc_to_gpio(const struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(desc_to_gpio);
 
+/**
+ * gpiod_hwgpio - Return the GPIO number of the passed descriptor relative to
+ *                its chip.
+ * @desc: GPIO descriptor
+ *
+ * Returns:
+ * Hardware offset of the GPIO represented by the descriptor.
+ */
+int gpiod_hwgpio(const struct gpio_desc *desc)
+{
+	return desc - &desc->gdev->descs[0];
+}
+EXPORT_SYMBOL_GPL(gpiod_hwgpio);
 
 /**
  * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 62d4c15b74f580273412e6d432ab306a2d2fe682..14e6a9807a89da6d7c6594a0a2de5f5032c49e0d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -273,14 +273,6 @@ int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev);
 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
 const char *gpiod_get_label(struct gpio_desc *desc);
 
-/*
- * Return the GPIO number of the passed descriptor relative to its chip
- */
-static inline int gpiod_hwgpio(const struct gpio_desc *desc)
-{
-	return desc - &desc->gdev->descs[0];
-}
-
 /* With descriptor prefix */
 
 #define __gpiod_pr(level, desc, fmt, ...) \
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 00df68c514051434e6fa67dc2307c6a8ce4ce3df..994d46874d560416175c9099e18180237839bd4c 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -171,6 +171,8 @@ int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name);
 struct gpio_desc *gpio_to_desc(unsigned gpio);
 int desc_to_gpio(const struct gpio_desc *desc);
 
+int gpiod_hwgpio(const struct gpio_desc *desc);
+
 struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
 					 const char *con_id, int index,
 					 enum gpiod_flags flags,

-- 
2.48.1