[U-Boot] [PATCH v1 1/5] dm: gpio: Add get_function_number ops

[Patrice Chotard]

From: Patrick Delaunay <patrick.delaunay at 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_function_number() to request the pin
function index from the driver when pin is not used
as gpio.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---

 drivers/gpio/gpio-uclass.c |  6 ++++++
 include/asm-generic/gpio.h | 11 +++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index da5e9ba6e524..fa249f7b12d4 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_function_number) {
+		ret = ops->get_function_number(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..f8cd6ddccbbf 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -266,6 +266,17 @@ struct dm_gpio_ops {
 	int (*get_function)(struct udevice *dev, unsigned offset);
 
 	/**
+	 * get_function_number() Get the function number
+	 *
+	 * get index for GPIOF_FUNC, when pin is not used as a GPIO
+	 *
+	 * @dev:     Device to check
+	 * @offset:  GPIO offset within that device
+	 * @return current function index
+	 */
+	int (*get_function_number)(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
-- 
1.9.1