ARM: bcm2835: Add Raspberry Pi's ACT LED to DT

The Raspberry Pi board has one GPIO-controlled LED labeled "ACT". Add it
to the DT via the gpio-leds driver, so users can control it from
userspace. If CONFIG_LEDS_TRIGGER_HEARTBEAT is set, the LED will also
signal some sign of life.

The GPIO circuitry is low-active. And as the bootloader may decide to
switch the LED on at boot time, the default state is 'keep'.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index aafda17..6e9deb7 100644 (file)
--- a/arch/arm/boot/dts/bcm2835-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts
@@ -8,6 +8,17 @@
        memory {
                reg = <0 0x10000000>;
        };
+
+       leds {
+               compatible = "gpio-leds";
+
+               act {
+                       label = "ACT";
+                       gpios = <&gpio 16 1>;
+                       default-state = "keep";
+                       linux,default-trigger = "heartbeat";
+               };
+       };
 };
 
 &gpio {