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Date: Wed, 4 May 2022 10:52:54 +0000
From: <Gireesh.Hiremath@...bosch.com>
To: <linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
<bcousson@...libre.com>, <tony@...mide.com>, <robh+dt@...nel.org>,
<krzysztof.kozlowski+dt@...aro.org>, <dmitry.torokhov@...il.com>,
<mkorpershoek@...libre.com>, <davidgow@...gle.com>,
<m.felsch@...gutronix.de>, <swboyd@...omium.org>,
<fengping.yu@...iatek.com>, <y.oudjana@...tonmail.com>,
<rdunlap@...radead.org>, <colin.king@...el.com>,
<Gireesh.Hiremath@...bosch.com>
CC: <sjoerd.simons@...labora.co.uk>, <VinayKumar.Shettar@...bosch.com>,
<Govindaraji.Sivanantham@...bosch.com>,
<anaclaudia.dias@...bosch.com>
Subject: [PATCH 4/4] dt-bindings: input: mt-matrix-keypad: add guardian mt matrix keypad bindings definition
From: Gireesh Hiremath <Gireesh.Hiremath@...bosch.com>
Add binding definition for the support of the Guardian
mt matrix keypad driver.
Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@...bosch.com>
---
.../bindings/input/mt-matrix-keypad.yaml | 134 ++++++++++++++++++
1 file changed, 134 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/mt-matrix-keypad.yaml
diff --git a/Documentation/devicetree/bindings/input/mt-matrix-keypad.yaml b/Documentation/devicetree/bindings/input/mt-matrix-keypad.yaml
new file mode 100644
index 000000000000..b52cd478f638
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/mt-matrix-keypad.yaml
@@ -0,0 +1,134 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/mt-matrix-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO driven mt matrix keypad device tree bindings
+
+maintainers:
+ - vinay <VinayKumar.Shettar@...bosch.com>
+
+description: |
+ GPIO driven mt matrix keypad is used to interface a SoC with a mt matrix
+ keypad. The mt matrix keypad supports multiple gpio line, all gpio line act
+ as row as wel as column lines, a key can be placed at each intersection
+ of a unique row number not equal to a unique column and they are diagonally
+ symmetric.
+
+ Example- For 5 gpio lines, possible matrix is 5x5 and maximum possible
+ keys are 10.
+
+ Sample matrix table for 7 button and 5 gpio line
+
+ ------------------------------------------------------
+ |Row\Col |GPIO 0 | GPIO 1 | GPIO 2 | GPIO 3 | GPIO 4 |
+ ------------------------------------------------------
+ | GPIO 0 | X | KEY_9 | KEY_2 | X | KEY_1 |
+ ------------------------------------------------------
+ | GPIO 1 | KEY_9 | X | KEY_6 | X | X |
+ ------------------------------------------------------
+ | GPIO 2 | KEY_2 | KEY_6 | X | KEY_4 | KEY_7 |
+ ------------------------------------------------------
+ | GPIO 3 | X | X | KEY_4 | X | KEY_8 |
+ ------------------------------------------------------
+ | GPIO 4 | KEY_1 | X | KEY_7 | KEY_8 | X |
+ ------------------------------------------------------
+ X - invalid key
+ KEY_x - preferred key code
+
+ The mt matrix keypad can sense a key-press and key-release by means of GPIO
+ lines and report the event using GPIO interrupts to the cpu.
+
+properties:
+ compatible:
+ oneOf:
+ - const: gpio-mt-matrix-keypad
+ - items:
+ - enum:
+ - gpio-mt-matrix-keypad
+ - const: gpio-mt-matrix-keypad
+
+ debounce-delay-ms:
+ description: Delay after the first bounce of button.
+ default: 0
+
+ col-scan-delay-us:
+ description: Delay before scanning next active line.
+ default: 0
+
+ number-of-button:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Number of button connected to the keypad controller.
+
+ linux,no-autorepeat:
+ description: |
+ Disable the Linux input system's autorepeat feature on the input device.
+
+ gpio-activelow:
+ description: Gpio line are active low.
+
+ line-gpios:
+ description: |
+ Gpio lines connected to keypad controller.
+ all gpio line act as row as wel as column lines.
+
+ linux,keymap:
+ $ref: '/schemas/types.yaml#/definitions/uint32-array'
+ description: |
+ An array of packed 1-cell entries containing the equivalent of row,
+ column and linux key-code. The 32-bit big endian cell is packed as:
+ row << 24 | column << 16 | key-code
+
+required:
+ - compatible
+ - number-of-button
+ - line-gpios
+ - linux,keymap
+
+additionalProperties: true
+
+examples:
+ - |
+ mt_matrix_keypad {
+ compatible = "gpio-mt-matrix-keypad";
+ debounce-delay-ms = <10>;
+ col-scan-delay-us = <2>;
+ number-of-button = <7>;
+ linux,no-autorepeat;
+ gpio-activelow;
+ line-gpios = <
+ &gpio1 24 1 /*gpio_56*/
+ &gpio1 23 1 /*gpio_55*/
+ &gpio1 22 1 /*gpio_54*/
+ &gpio1 20 1 /*gpio_52*/
+ &gpio1 16 1 /*gpio_48*/
+ >;
+ linux,keymap = <
+ 0x00000000 /* row 0, col 0, KEY_RESERVED/invalid key */
+ 0x0001000a /* row 0, col 1, KEY_9 */
+ 0x00020003 /* row 0, col 2, KEY_2 */
+ 0x00030000 /* row 0, col 3, KEY_RESERVED/invalid key */
+ 0x00040002 /* row 0, col 4, KEY_1 */
+ 0x0100000a /* row 1, col 0, KEY_9 */
+ 0x01010000 /* row 1, col 1, KEY_RESERVED/invalid key */
+ 0x01020007 /* row 1, col 2, KEY_6 */
+ 0x01030000 /* row 1, col 3, KEY_RESERVED/invalid key */
+ 0x01040000 /* row 1, col 4, KEY_RESERVED/invalid key */
+ 0x02000003 /* row 2, col 0, KEY_2 */
+ 0x02010007 /* row 2, col 1, KEY_6 */
+ 0x02020000 /* row 2, col 2, KEY_RESERVED/invalid key */
+ 0x02030005 /* row 2, col 3, KEY_4 */
+ 0x02040008 /* row 2, col 4, KEY_7 */
+ 0x03000000 /* row 3, col 0, KEY_RESERVED/invalid key */
+ 0x03010000 /* row 3, col 1, KEY_RESERVED/invalid key */
+ 0x03020005 /* row 3, col 2, KEY_4 */
+ 0x03030000 /* row 3, col 3, KEY_RESERVED/invalid key */
+ 0x03040009 /* row 3, col 4, KEY_8 */
+ 0x04000002 /* row 4, col 0, KEY_1 */
+ 0x04010000 /* row 4, col 1, KEY_RESERVED/invalid key */
+ 0x04020008 /* row 4, col 2, KEY_7 */
+ 0x04030009 /* row 4, col 3, KEY_8 */
+ 0x04040000 /* row 4, col 4, KEY_RESERVED/invalid key */
+ >;
+ };
--
2.20.1
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