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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /Documentation/devicetree/bindings/leds/common.txt
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+Common leds properties.
+
+LED and flash LED devices provide the same basic functionality as current
+regulators, but extended with LED and flash LED specific features like
+blinking patterns, flash timeout, flash faults and external flash strobe mode.
+
+Many LED devices expose more than one current output that can be connected
+to one or more discrete LED component. Since the arrangement of connections
+can influence the way of the LED device initialization, the LED components
+have to be tightly coupled with the LED device binding. They are represented
+by child nodes of the parent LED device binding.
+
+Optional properties for child nodes:
+- led-sources : List of device current outputs the LED is connected to. The
+ outputs are identified by the numbers that must be defined
+ in the LED device binding documentation.
+- label : The label for this LED. If omitted, the label is taken from the node
+ name (excluding the unit address). It has to uniquely identify
+ a device, i.e. no other LED class device can be assigned the same
+ label.
+
+- linux,default-trigger : 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 for leds-gpio see "default-state"
+ property in Documentation/devicetree/bindings/gpio/led.txt)
+ "heartbeat" - LED "double" flashes at a load average based rate
+ "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-us : timeout in microseconds after which the flash
+ LED is turned off
+
+
+Examples:
+
+system-status {
+ label = "Status";
+ linux,default-trigger = "heartbeat";
+ ...
+};
+
+camera-flash {
+ label = "Flash";
+ led-sources = <0>, <1>;
+ max-microamp = <50000>;
+ flash-max-microamp = <320000>;
+ flash-timeout-us = <500000>;
+};