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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.yaml
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
see Documentation/devicetree/bindings/leds/common.txt
Example:
syscon: syscon@10000000 {
compatible = "arm,realview-pb1176-syscon", "syscon";
reg = <0x10000000 0x1000>;
led@8.0 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x01>;
label = "versatile:0";
linux,default-trigger = "heartbeat";
default-state = "on";
};
led@8.1 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x02>;
label = "versatile:1";
linux,default-trigger = "mmc0";
default-state = "off";
};
led@8.2 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x04>;
label = "versatile:2";
linux,default-trigger = "cpu0";
default-state = "off";
};
led@8.3 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x08>;
label = "versatile:3";
default-state = "off";
};
led@8.4 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x10>;
label = "versatile:4";
default-state = "off";
};
led@8.5 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x20>;
label = "versatile:5";
default-state = "off";
};
led@8.6 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x40>;
label = "versatile:6";
default-state = "off";
};
led@8.7 {
compatible = "register-bit-led";
offset = <0x08>;
mask = <0x80>;
label = "versatile:7";
default-state = "off";
};
};
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