[PATCH 1/5] dt-bindings: input: Add the PinePhone keyboard binding

[Samuel Holland <samuel@sholland.org>]

Add devicetree support for the PinePhone keyboard case, which provides a
matrix keyboard interface and a proxied I2C bus.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---

 .../input/pine64,pinephone-keyboard.yaml      | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml

diff --git a/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml b/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
new file mode 100644
index 000000000000..00f084b263f0
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/pine64,pinephone-keyboard.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Pine64 PinePhone keyboard device tree bindings
+
+maintainers:
+  - Samuel Holland <samuel@sholland.org>
+
+description:
+  A keyboard accessory is available for the Pine64 PinePhone and PinePhone Pro.
+  It connects via I2C, providing a raw scan matrix, a flashing interface, and a
+  subordinate I2C bus for communication with a battery charger IC.
+
+allOf:
+  - $ref: /schemas/input/matrix-keymap.yaml#
+
+properties:
+  compatible:
+    const: pine64,pinephone-keyboard
+
+  reg:
+    const: 0x15
+
+  interrupts:
+    maxItems: 1
+
+  linux,fn-keymap:
+    $ref: /schemas/input/matrix-keymap.yaml#/properties/linux,keymap
+    description: keymap used when the Fn key is pressed
+
+  wakeup-source: true
+
+  i2c-bus:
+    $ref: /schemas/i2c/i2c-controller.yaml#
+
+dependencies:
+  linux,fn-keymap: [ 'keypad,num-columns', 'keypad,num-rows' ]
+  linux,keymap: [ 'keypad,num-columns', 'keypad,num-rows' ]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      keyboard@15 {
+        compatible = "pine64,pinephone-keyboard";
+        reg = <0x15>;
+        interrupt-parent = <&r_pio>;
+        interrupts = <0 12 IRQ_TYPE_EDGE_FALLING>; /* PL12 */
+        keypad,num-rows = <6>;
+        keypad,num-columns = <12>;
+        linux,fn-keymap = <MATRIX_KEY(0,  0, KEY_FN_ESC)
+                           MATRIX_KEY(0,  1, KEY_F1)
+                           MATRIX_KEY(0,  2, KEY_F2)
+                           /* ... */
+                           MATRIX_KEY(5,  2, KEY_FN)
+                           MATRIX_KEY(5,  3, KEY_LEFTALT)
+                           MATRIX_KEY(5,  5, KEY_RIGHTALT)>;
+        linux,keymap = <MATRIX_KEY(0,  0, KEY_ESC)
+                        MATRIX_KEY(0,  1, KEY_1)
+                        MATRIX_KEY(0,  2, KEY_2)
+                        /* ... */
+                        MATRIX_KEY(5,  2, KEY_FN)
+                        MATRIX_KEY(5,  3, KEY_LEFTALT)
+                        MATRIX_KEY(5,  5, KEY_RIGHTALT)>;
+
+        i2c-bus {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          charger@75 {
+            reg = <0x75>;
+          };
+        };
+      };
+    };
-- 
2.33.1