Kernel-4.18.0-80.el8_register-bit-le

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
  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";
};

};