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| author | Linus Walleij <linus.walleij@linaro.org> | 2014-05-22 00:35:37 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2014-09-26 00:27:19 +0200 |
| commit | 741c798a0229c9523c1f68bc8c83a79fefad4333 (patch) | |
| tree | 8e17daa9c6f3712931fb31bb2aeeacb9445cc715 /Documentation/devicetree/bindings/leds/register-bit-led.txt | |
| parent | a2974c9c1f83e7163e855eb80c772db45bc9a291 (diff) | |
| download | linux-741c798a0229c9523c1f68bc8c83a79fefad4333.tar.gz | |
leds: add device tree bindings for register bit LEDs
This adds the device tree bindings used by register bit LEDs.
Cc: devicetree@vger.kernel.org
Cc: Bryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/leds/register-bit-led.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/leds/register-bit-led.txt | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/leds/register-bit-led.txt b/Documentation/devicetree/bindings/leds/register-bit-led.txt new file mode 100644 index 000000000000..379cefdc0bda --- /dev/null +++ b/Documentation/devicetree/bindings/leds/register-bit-led.txt @@ -0,0 +1,99 @@ +Device Tree Bindings for Register Bit LEDs + +Register bit leds are used with syscon multifunctional devices +where single bits in a certain register can turn on/off a +single LED. The register bit LEDs appear as children to the +syscon device, with the proper compatible string. For the +syscon bindings see: +Documentation/devicetree/bindings/mfd/syscon.txt + +Each LED is represented as a sub-node of the syscon device. Each +node's name represents the name of the corresponding LED. + +LED sub-node properties: + +Required properties: +- compatible : must be "register-bit-led" +- offset : register offset to the register controlling this LED +- mask : bit mask for the bit controlling this LED in the register + typically 0x01, 0x02, 0x04 ... + +Optional properties: +- label : (optional) + see Documentation/devicetree/bindings/leds/common.txt +- linux,default-trigger : (optional) + see Documentation/devicetree/bindings/leds/common.txt +- 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. + +Example: + +syscon: syscon@10000000 { + compatible = "arm,realview-pb1176-syscon", "syscon"; + reg = <0x10000000 0x1000>; + + led@08.0 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x01>; + label = "versatile:0"; + linux,default-trigger = "heartbeat"; + default-state = "on"; + }; + led@08.1 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x02>; + label = "versatile:1"; + linux,default-trigger = "mmc0"; + default-state = "off"; + }; + led@08.2 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x04>; + label = "versatile:2"; + linux,default-trigger = "cpu0"; + default-state = "off"; + }; + led@08.3 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x08>; + label = "versatile:3"; + default-state = "off"; + }; + led@08.4 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x10>; + label = "versatile:4"; + default-state = "off"; + }; + led@08.5 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x20>; + label = "versatile:5"; + default-state = "off"; + }; + led@08.6 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x40>; + label = "versatile:6"; + default-state = "off"; + }; + led@08.7 { + compatible = "register-bit-led"; + offset = <0x08>; + mask = <0x80>; + label = "versatile:7"; + default-state = "off"; + }; +}; |