- Freescale i.MX Keypad Port(KPP) device tree bindings
The KPP is designed to interface with a keypad matrix with 2-point contact
or 3-point contact keys. The KPP is designed to simplify the software task
of scanning a keypad matrix. The KPP is capable of detecting, debouncing,
and decoding one or multiple keys pressed simultaneously on a keypad.
Required SoC Specific Properties:
compatible: Should be “fsl,
-kpp”. reg: Physical base address of the KPP and length of memory mapped
region.interrupts: The KPP interrupt number to the CPU(s).
clocks: The clock provided by the SoC to the KPP. Some SoCs use dummy
clock(The clock for the KPP is provided by the SoCs automatically).
Required Board Specific Properties:
pinctrl-names: The definition can be found at
pinctrl/pinctrl-bindings.txt.pinctrl-0: The definition can be found at
pinctrl/pinctrl-bindings.txt.linux,keymap: The definition can be found at
bindings/input/matrix-keymap.txt.
Example:
kpp: kpp@73f94000 {
compatible = “fsl,imx51-kpp”, “fsl,imx21-kpp”;
reg = <0x73f94000 0x4000>;
interrupts = <60>;
clocks = <&clks 0>;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_kpp_1>;
linux,keymap = <0x00000067 /* KEY_UP */
0x0001006c /* KEY_DOWN */
0x00020072 /* KEY_VOLUMEDOWN */
0x00030066 /* KEY_HOME */
0x0100006a /* KEY_RIGHT */
0x01010069 /* KEY_LEFT */
0x0102001c /* KEY_ENTER */
0x01030073 /* KEY_VOLUMEUP */
0x02000040 /* KEY_F6 */
0x02010042 /* KEY_F8 */
0x02020043 /* KEY_F9 */
0x02030044 /* KEY_F10 */
0x0300003b /* KEY_F1 */
0x0301003c /* KEY_F2 */
0x0302003d /* KEY_F3 */
0x03030074>; /* KEY_POWER */
};
