From: Patrick Delaunay patrick.delaunay@st.com
When a pin is not configured as a GPIO, it could have several alternate function.
To be able to identify the alternate function, add ops get_alt_function() to request the pin alternate function index from the driver when pin is not used as gpio.
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com Reviewed-by: Simon Glass sjg@chromium.org Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
Changes in v3: - Rename get_alternate_function to get_alt_function in include/asm-generic/gpio.h
Changes in v2: - Rename get_function_number to get_alternate_function in include/asm-generic/gpio.h
drivers/gpio/gpio-uclass.c | 6 ++++++ include/asm-generic/gpio.h | 13 +++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c index da5e9ba6e524..27010a1ebf22 100644 --- a/drivers/gpio/gpio-uclass.c +++ b/drivers/gpio/gpio-uclass.c @@ -568,6 +568,12 @@ int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize) label ? label : ""); }
+ if (func == GPIOF_FUNC && ops->get_alt_function) { + ret = ops->get_alt_function(dev, offset); + if (ret >= 0) + snprintf(str + len, buffsize - len, ": %d", ret); + } + return 0; }
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index d03602696f6d..dd3d77fafa98 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -266,6 +266,19 @@ struct dm_gpio_ops { int (*get_function)(struct udevice *dev, unsigned offset);
/** + * get_alt_function() Get the pins alternate function + * + * When a pin is not configured as GPIO, this pin can have several + * alternate function. get_alt_function indicate the current + * pin's alternate function index + * + * @dev: Device to check + * @offset: GPIO offset within that device + * @return current alternate function index + */ + int (*get_alt_function)(struct udevice *dev, unsigned int offset); + + /** * xlate() - Translate phandle arguments into a GPIO description * * This function should set up the fields in desc according to the