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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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