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authorGrant Likely <grant.likely@secretlab.ca>2011-02-28 01:36:21 -0700
committerGrant Likely <grant.likely@secretlab.ca>2011-02-28 01:36:21 -0700
commit38a5d6736e7f714cc56d58692001e66dcbb98799 (patch)
tree337d32375e10b04642013710c2c424514474b32c /Documentation/devicetree/bindings/gpio/led.txt
parent0bfd95a2a104dfc2469d68de52df99939371c0d4 (diff)
parentf5412be599602124d2bdd49947b231dd77c0bf99 (diff)
downloadblackbird-op-linux-38a5d6736e7f714cc56d58692001e66dcbb98799.tar.gz
blackbird-op-linux-38a5d6736e7f714cc56d58692001e66dcbb98799.zip
Merge commit 'v2.6.38-rc6' into devicetree/next
Conflicts: drivers/spi/pxa2xx_spi_pci.c
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+LEDs connected to GPIO lines
+
+Required properties:
+- compatible : should be "gpio-leds".
+
+Each LED is represented as a sub-node of the gpio-leds device. Each
+node's name represents the name of the corresponding LED.
+
+LED sub-node properties:
+- gpios : Should specify the LED's GPIO, see "Specifying GPIO information
+ for devices" in Documentation/powerpc/booting-without-of.txt. Active
+ low LEDs should be indicated using flags in the GPIO specifier.
+- label : (optional) The label for this LED. If omitted, the label is
+ taken from the node name (excluding the unit address).
+- 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
+- default-state: (optional) The initial state of the LED. Valid
+ values are "on", "off", and "keep". If the LED is already on or off
+ and the default-state property is set the to same value, then no
+ glitch should be produced where the LED momentarily turns off (or
+ on). The "keep" setting will keep the LED at whatever its current
+ state is, without producing a glitch. The default is off if this
+ property is not present.
+
+Examples:
+
+leds {
+ compatible = "gpio-leds";
+ hdd {
+ label = "IDE Activity";
+ gpios = <&mcu_pio 0 1>; /* Active low */
+ linux,default-trigger = "ide-disk";
+ };
+
+ fault {
+ gpios = <&mcu_pio 1 0>;
+ /* Keep LED on if BIOS detected hardware fault */
+ default-state = "keep";
+ };
+};
+
+run-control {
+ compatible = "gpio-leds";
+ red {
+ gpios = <&mpc8572 6 0>;
+ default-state = "off";
+ };
+ green {
+ gpios = <&mpc8572 7 0>;
+ default-state = "on";
+ };
+}
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