Add attributes neccessary for LED flashes to
devicetree/bindings/leds/common.txt .

This will allow me to add device tree support for adp1653 i2c flash
LED driver, and allow Jacek Anaszewski to add support for more LED
drivers..

Signed-off-by: Pavel Machek <redacted>

diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 2d88816..e9acbbc 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt

@@ -14,6 +14,15 @@ Optional properties for child nodes:
       "ide-disk" - LED indicates disk activity
       "timer" - LED flashes at a fixed, configurable rate

+- max-microamp : maximum intensity in microamperes of the LED
+  	         (torch LED for flash devices)
+- flash-max-microamp : maximum intensity in microamperes of the
+                       flash LED; it is mandatory if the LED should
+		       support the flash mode
+- flash-timeout-microsec : timeout in microseconds after which the flash
+                           LED is turned off
+
+
  Examples:

  system-status {

@@ -21,3 +30,10 @@ system-status {
  	linux,default-trigger = "heartbeat";
  	...
  };
+
+camera-flash {
+	label = "Flash";
+	max-microamp = <50000>;
+	flash-max-microamp = <320000>;
+	flash-timeout-microsec = <500000>;
+}