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Date:   Mon, 18 Jan 2021 00:34:26 +0000
From:   Daniel Scally <>
Subject: [PATCH v2 5/7] gpio: gpiolib-acpi: Export acpi_get_gpiod()

I need to be able to translate GPIO resources in an acpi_device's _CRS
into gpio_descs. Those are represented in _CRS as a pathname to a GPIO
device plus the pin's index number: this function is perfect for that

Signed-off-by: Daniel Scally <>
Changes in v2:


 drivers/gpio/gpiolib-acpi.c | 3 ++-
 include/linux/acpi.h        | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index e37a57d0a2f0..83f9f85cd0ab 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -111,7 +111,7 @@ static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
  * controller does not have GPIO chip registered at the moment. This is to
  * support probe deferral.
-static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
+struct gpio_desc *acpi_get_gpiod(char *path, int pin)
 	struct gpio_chip *chip;
 	acpi_handle handle;
@@ -127,6 +127,7 @@ static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
 	return gpiochip_get_desc(chip, pin);
 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 2630c2e953f7..5cd272326eb7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1066,6 +1066,7 @@ void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const c
 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
+struct gpio_desc *acpi_get_gpiod(char *path, int pin);
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 					      struct acpi_resource_gpio **agpio)
@@ -1076,6 +1077,10 @@ static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 	return -ENXIO;
+struct gpio_desc *acpi_get_gpiod(char *path, int pin)
+	return NULL;
 /* Device properties */

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