Kernel-4.18.0-80.el8_leds-pca955x

• NXP - pca955x LED driver

The PCA955x family of chips are I2C LED blinkers whose pins not used
to control LEDs can be used as general purpose I/Os. The GPIO pins can
be input or output, and output pins can also be pulse-width controlled.

Required properties:

• compatible : should be one of :
  “nxp,pca9550”
  “nxp,pca9551”
  “nxp,pca9552”
  “nxp,pca9553”
• #address-cells: must be 1
• #size-cells: must be 0
• reg: I2C slave address. depends on the model.

Optional properties:

• gpio-controller: allows pins to be used as GPIOs.
• #gpio-cells: must be 2.
• gpio-line-names: define the names of the GPIO lines

LED sub-node properties:

• reg : number of LED line.

    from 0 to  1 for the pca9550
    from 0 to  7 for the pca9551
    from 0 to 15 for the pca9552
    from 0 to  3 for the pca9553
  

• type: (optional) either
  PCA9532_TYPE_NONE
  PCA9532_TYPE_LED
  PCA9532_TYPE_GPIO
  see dt-bindings/leds/leds-pca955x.h (default to LED)
• label : (optional)
  see Documentation/devicetree/bindings/leds/common.txt
• linux,default-trigger : (optional)
  see Documentation/devicetree/bindings/leds/common.txt

Examples:

pca9552: pca9552@60 {
compatible = “nxp,pca9552”;
#address-cells = <1>;
#size-cells = <0>;
reg = <0x60>;

gpio-controller;
#gpio-cells = <2>;
gpio-line-names = "GPIO12", "GPIO13", "GPIO14", "GPIO15";

gpio@12 {
    reg = <12>;
    type = <PCA955X_TYPE_GPIO>;
};
gpio@13 {
    reg = <13>;
    type = <PCA955X_TYPE_GPIO>;
};
gpio@14 {
    reg = <14>;
    type = <PCA955X_TYPE_GPIO>;
};
gpio@15 {
    reg = <15>;
    type = <PCA955X_TYPE_GPIO>;
};

led@0 {
    label = "red:power";
    linux,default-trigger = "default-on";
    reg = <0>;
    type = <PCA955X_TYPE_LED>;
};
led@1 {
    label = "green:power";
    reg = <1>;
    type = <PCA955X_TYPE_LED>;
};
led@2 {
    label = "pca9552:yellow";
    reg = <2>;
    type = <PCA955X_TYPE_LED>;
};
led@3 {
    label = "pca9552:white";
    reg = <3>;
    type = <PCA955X_TYPE_LED>;
};

};