[PATCH v2 07/14] gpiolib: Export symbol gpiochip_set_names()

Andrea della Porta
2024-10-07T13:20:11Z

Being able to assign gpio line names dynamically is a feature
that could be used by drivers that do not have the exact naming
(e.g. through the DTB/DTBO) at probing time.
An example of this is the RP1 driver that populates the DT
at late time through a DT overlay. In this case a custom overlay
can be loaded from userspace with the gpio line names.

Export gpiochip_set_names() to allow refreshing the gpio line
names from the driver module.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
drivers/gpio/gpiolib.c | 3 ++-
include/linux/gpio/driver.h | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c6afbf434366..a2aa3560094a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -522,7 +522,7 @@ static void gpiochip_set_desc_names(struct gpio_chip *gc)
* names belong to the underlying firmware node and should not be released
* by the caller.
*/
-static int gpiochip_set_names(struct gpio_chip *chip)
+int gpiochip_set_names(struct gpio_chip *chip)
{
struct gpio_device *gdev = chip->gpiodev;
struct device *dev = &gdev->dev;
@@ -589,6 +589,7 @@ static int gpiochip_set_names(struct gpio_chip *chip)

return 0;
}
+EXPORT_SYMBOL(gpiochip_set_names);

static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc)
{
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 2dd7cb9cc270..6e4cd7b7e47e 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -679,6 +679,9 @@ bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);

+/* Assign gpio line names from device property */
+int gpiochip_set_names(struct gpio_chip *chip);
+
/* get driver data */
void *gpiochip_get_data(struct gpio_chip *gc);

--
2.35.3