linux/Documentation/devicetree/bindings/input/imx-keypad.txt
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   1* Freescale i.MX Keypad Port(KPP) device tree bindings
   2
   3The KPP is designed to interface with a keypad matrix with 2-point contact
   4or 3-point contact keys. The KPP is designed to simplify the software task
   5of scanning a keypad matrix. The KPP is capable of detecting, debouncing,
   6and decoding one or multiple keys pressed simultaneously on a keypad.
   7
   8Required SoC Specific Properties:
   9- compatible: Should be "fsl,<soc>-kpp".
  10
  11- reg: Physical base address of the KPP and length of memory mapped
  12  region.
  13
  14- interrupts: The KPP interrupt number to the CPU(s).
  15
  16- clocks: The clock provided by the SoC to the KPP. Some SoCs use dummy
  17clock(The clock for the KPP is provided by the SoCs automatically).
  18
  19Required Board Specific Properties:
  20- pinctrl-names: The definition can be found at
  21pinctrl/pinctrl-bindings.txt.
  22
  23- pinctrl-0: The definition can be found at
  24pinctrl/pinctrl-bindings.txt.
  25
  26- linux,keymap: The definition can be found at
  27bindings/input/matrix-keymap.txt.
  28
  29Example:
  30kpp: kpp@73f94000 {
  31        compatible = "fsl,imx51-kpp", "fsl,imx21-kpp";
  32        reg = <0x73f94000 0x4000>;
  33        interrupts = <60>;
  34        clocks = <&clks 0>;
  35        pinctrl-names = "default";
  36        pinctrl-0 = <&pinctrl_kpp_1>;
  37        linux,keymap = <0x00000067      /* KEY_UP */
  38                        0x0001006c      /* KEY_DOWN */
  39                        0x00020072      /* KEY_VOLUMEDOWN */
  40                        0x00030066      /* KEY_HOME */
  41                        0x0100006a      /* KEY_RIGHT */
  42                        0x01010069      /* KEY_LEFT */
  43                        0x0102001c      /* KEY_ENTER */
  44                        0x01030073      /* KEY_VOLUMEUP */
  45                        0x02000040      /* KEY_F6 */
  46                        0x02010042      /* KEY_F8 */
  47                        0x02020043      /* KEY_F9 */
  48                        0x02030044      /* KEY_F10 */
  49                        0x0300003b      /* KEY_F1 */
  50                        0x0301003c      /* KEY_F2 */
  51                        0x0302003d      /* KEY_F3 */
  52                        0x03030074>;    /* KEY_POWER */
  53};
  54