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- * Broadcom Keypad Controller device tree bindings
- Broadcom 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.
- This binding is based on the matrix-keymap binding with the following
- changes:
- keypad,num-rows and keypad,num-columns are required.
- Required SoC Specific Properties:
- - compatible: should be "brcm,bcm-keypad"
- - reg: physical base address of the controller and length of memory mapped
- region.
- - interrupts: The interrupt number to the cpu.
- Board Specific Properties:
- - keypad,num-rows: Number of row lines connected to the keypad
- controller.
- - keypad,num-columns: Number of column lines connected to the
- keypad controller.
- - col-debounce-filter-period: The debounce period for the Column filter.
- KEYPAD_DEBOUNCE_1_ms = 0
- KEYPAD_DEBOUNCE_2_ms = 1
- KEYPAD_DEBOUNCE_4_ms = 2
- KEYPAD_DEBOUNCE_8_ms = 3
- KEYPAD_DEBOUNCE_16_ms = 4
- KEYPAD_DEBOUNCE_32_ms = 5
- KEYPAD_DEBOUNCE_64_ms = 6
- KEYPAD_DEBOUNCE_128_ms = 7
- - status-debounce-filter-period: The debounce period for the Status filter.
- KEYPAD_DEBOUNCE_1_ms = 0
- KEYPAD_DEBOUNCE_2_ms = 1
- KEYPAD_DEBOUNCE_4_ms = 2
- KEYPAD_DEBOUNCE_8_ms = 3
- KEYPAD_DEBOUNCE_16_ms = 4
- KEYPAD_DEBOUNCE_32_ms = 5
- KEYPAD_DEBOUNCE_64_ms = 6
- KEYPAD_DEBOUNCE_128_ms = 7
- - row-output-enabled: An optional property indicating whether the row or
- column is being used as output. If specified the row is being used
- as the output. Else defaults to column.
- - pull-up-enabled: An optional property indicating the Keypad scan mode.
- If specified implies the keypad scan pull-up has been enabled.
- - autorepeat: Boolean, Enable auto repeat feature of Linux input
- subsystem (optional).
- - linux,keymap: The keymap for keys as described in the binding document
- devicetree/bindings/input/matrix-keymap.txt.
- Example:
- #include "dt-bindings/input/input.h"
- / {
- keypad: keypad@180ac000 {
- /* Required SoC specific properties */
- compatible = "brcm,bcm-keypad";
- /* Required Board specific properties */
- keypad,num-rows = <5>;
- keypad,num-columns = <5>;
- status = "okay";
- linux,keymap = <MATRIX_KEY(0x00, 0x02, KEY_F) /* key_forward */
- MATRIX_KEY(0x00, 0x03, KEY_HOME) /* key_home */
- MATRIX_KEY(0x00, 0x04, KEY_M) /* key_message */
- MATRIX_KEY(0x01, 0x00, KEY_A) /* key_contacts */
- MATRIX_KEY(0x01, 0x01, KEY_1) /* key_1 */
- MATRIX_KEY(0x01, 0x02, KEY_2) /* key_2 */
- MATRIX_KEY(0x01, 0x03, KEY_3) /* key_3 */
- MATRIX_KEY(0x01, 0x04, KEY_S) /* key_speaker */
- MATRIX_KEY(0x02, 0x00, KEY_P) /* key_phone */
- MATRIX_KEY(0x02, 0x01, KEY_4) /* key_4 */
- MATRIX_KEY(0x02, 0x02, KEY_5) /* key_5 */
- MATRIX_KEY(0x02, 0x03, KEY_6) /* key_6 */
- MATRIX_KEY(0x02, 0x04, KEY_VOLUMEUP) /* key_vol_up */
- MATRIX_KEY(0x03, 0x00, KEY_C) /* key_call_log */
- MATRIX_KEY(0x03, 0x01, KEY_7) /* key_7 */
- MATRIX_KEY(0x03, 0x02, KEY_8) /* key_8 */
- MATRIX_KEY(0x03, 0x03, KEY_9) /* key_9 */
- MATRIX_KEY(0x03, 0x04, KEY_VOLUMEDOWN) /* key_vol_down */
- MATRIX_KEY(0x04, 0x00, KEY_H) /* key_headset */
- MATRIX_KEY(0x04, 0x01, KEY_KPASTERISK) /* key_* */
- MATRIX_KEY(0x04, 0x02, KEY_0) /* key_0 */
- MATRIX_KEY(0x04, 0x03, KEY_GRAVE) /* key_# */
- MATRIX_KEY(0x04, 0x04, KEY_MUTE) /* key_mute */
- >;
- /* Optional board specific properties */
- col-debounce-filter-period = <5>;
- row-output-enabled;
- pull-up-enabled;
- };
- };
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