Support for device tree booted kernel.
When the kernel is booted with DeviceTree blob we support one led per
leds-pwm device to have cleaner integration with the PWM subsystem.

For usage see:
Documentation/devicetree/bindings/leds/leds-pwm.txt

Signed-off-by: Peter Ujfalusi <redacted>
---
 .../devicetree/bindings/leds/leds-pwm.txt          |  34 ++++++
 drivers/leds/leds-pwm.c                            | 125 +++++++++++++++------
 2 files changed, 127 insertions(+), 32 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-pwm.txt

diff --git a/Documentation/devicetree/bindings/leds/leds-pwm.txt b/Documentation/devicetree/bindings/leds/leds-pwm.txt
new file mode 100644
index 0000000..9fe3040
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-pwm.txt

@@ -0,0 +1,34 @@
+LED connected to PWM
+
+Required properties:
+- compatible : should be "pwm-leds".
+- pwms : PWM property, please refer to: 
+  Documentation/devicetree/bindings/pwm/pwm.txt
+- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
+- label : (optional) The label for this LED.  If omitted, the label is
+  taken from the node name (excluding the unit address).
+- max-brightness : Maximum brightness possible for the LED
+- linux,default-trigger :  (optional) This parameter, if present, is a
+  string defining the trigger assigned to the LED.  Current triggers are:
+    "backlight" - LED will act as a back-light, controlled by the framebuffer
+		  system
+    "default-on" - LED will turn on, but see "default-state" below
+    "heartbeat" - LED "double" flashes at a load average based rate
+    "ide-disk" - LED indicates disk activity
+    "timer" - LED flashes at a fixed, configurable rate