Kernel-4.18.0-80.el8_samsung-keypa

• Samsung’s Keypad Controller device tree bindings

Samsung’s Keypad controller is used to interface a SoC with a matrix-type
keypad device. The keypad controller supports multiple row and column lines.
A key can be placed at each intersection of a unique row and a unique column.
The keypad controller can sense a key-press and key-release and report the
event using a interrupt to the cpu.

Required SoC Specific Properties:

• compatible: should be one of the following

  • “samsung,s3c6410-keypad”: For controllers compatible with s3c6410 keypad
    controller.
  • “samsung,s5pv210-keypad”: For controllers compatible with s5pv210 keypad
    controller.

• reg: physical base address of the controller and length of memory mapped
  region.

• interrupts: The interrupt number to the cpu.

Required Board Specific Properties:

• samsung,keypad-num-rows: Number of row lines connected to the keypad
  controller.

• samsung,keypad-num-columns: Number of column lines connected to the
  keypad controller.

• Keys represented as child nodes: Each key connected to the keypad
  controller is represented as a child node to the keypad controller
  device node and should include the following properties.

  • keypad,row: the row number to which the key is connected.
  • keypad,column: the column number to which the key is connected.
  • linux,code: the key-code to be reported when the key is pressed
    and released.

• pinctrl-0: Should specify pin control groups used for this controller.

• pinctrl-names: Should contain only one value - “default”.

Optional Properties:

• wakeup-source: use any event on keypad as wakeup event.

     (Legacy property supported: "linux,input-wakeup")
  

Optional Properties specific to linux:

• linux,keypad-no-autorepeat: do no enable autorepeat feature.

Example:
keypad@100a0000 {
compatible = “samsung,s5pv210-keypad”;
reg = <0x100A0000 0x100>;
interrupts = <173>;
samsung,keypad-num-rows = <2>;
samsung,keypad-num-columns = <8>;
linux,input-no-autorepeat;
wakeup-source;

    pinctrl-names = "default";
    pinctrl-0 = <&keypad_rows &keypad_columns>;

    key_1 {
        keypad,row = <0>;
        keypad,column = <3>;
        linux,code = <2>;
    };

    key_2 {
        keypad,row = <0>;
        keypad,column = <4>;
        linux,code = <3>;
    };

    key_3 {
        keypad,row = <0>;
        keypad,column = <5>;
        linux,code = <4>;
    };
};