From: Patrick Delaunay <patrick.delau...@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.delau...@st.com>
Signed-off-by: Patrice Chotard <patrice.chot...@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
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