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>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index aafda174a605..6e9deb786a7d 100644
--- 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 {