README: document the CONFIG_GPIO_LED symbol

The CONFIG_GPIO_LED symbol does not have any documentation in the README
file. Document the CONFIG_GPIO_LED symbol.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>

diff --git a/README b/README
index c97ff0af0b6283057b53ba992682b7cbfdbc7831..7b393b79b34c8ffcaf272f23c7259f15a75585a9 100644 (file)
--- a/README
+++ b/README
@@ -1963,6 +1963,14 @@ CBFS (Coreboot Filesystem) support
                kernel). Defining CONFIG_STATUS_LED enables this
                feature in U-Boot.
 
+               Additional options:
+
+               CONFIG_GPIO_LED
+               The status LED can be connected to a GPIO pin.
+               In such cases, the gpio_led driver can be used as a
+               status LED backend implementation. Define CONFIG_GPIO_LED
+               to include the gpio_led driver in the U-Boot binary.
+
 - CAN Support: CONFIG_CAN_DRIVER
 
                Defining CONFIG_CAN_DRIVER enables CAN driver support