Input: add driver for Broadcom keypad controller

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 an interrupt to the CPU.

Reviewed-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 108 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt b/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt
new file mode 100644
index 000000000000..b77f50bd6403
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt
@@ -0,0 +1,108 @@
+* 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;
+
+        };
+};