dt-bindings: input: convert cros-ec-keyb to json-schema

Convert the google,cros-ec-keyb binding to YAML and add it as a property
of google,cros-ec.yaml

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Link: https://lore.kernel.org/r/20201021114308.25485-3-ricardo.canuelo@collabora.com
Signed-off-by: Rob Herring <robh@kernel.org>

Author: Ricardo Cañuelo

Documentation/devicetree/bindings/input/cros-ec-keyb.txt

@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/input/google,cros-ec-keyb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ChromeOS EC Keyboard
+
+maintainers:
+  - Simon Glass <sjg@chromium.org>
+  - Benson Leung <bleung@chromium.org>
+  - Enric Balletbo i Serra <enric.balletbo@collabora.com>
+
+description: |
+  Google's ChromeOS EC Keyboard is a simple matrix keyboard
+  implemented on a separate EC (Embedded Controller) device. It provides
+  a message for reading key scans from the EC. These are then converted
+  into keycodes for processing by the kernel.
+
+allOf:
+  - $ref: "/schemas/input/matrix-keymap.yaml#"
+
+properties:
+  compatible:
+    const: google,cros-ec-keyb
+
+  google,needs-ghost-filter:
+    description:
+      Enable a ghost filter for the matrix keyboard. This is recommended
+      if the EC does not have its own logic or hardware for this.
+    type: boolean
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    cros-ec-keyb {
+        compatible = "google,cros-ec-keyb";
+        keypad,num-rows = <8>;
+        keypad,num-columns = <13>;
+        google,needs-ghost-filter;
+        /*
+         * Keymap entries take the form of 0xRRCCKKKK where
+         * RR=Row CC=Column KKKK=Key Code
+         * The values below are for a US keyboard layout and
+         * are taken from the Linux driver. Note that the
+         * 102ND key is not used for US keyboards.
+         */
+        linux,keymap = <
+            /* CAPSLCK F1         B          F10     */
+            0x0001003a 0x0002003b 0x00030030 0x00040044
+            /* N       =          R_ALT      ESC     */
+            0x00060031 0x0008000d 0x000a0064 0x01010001
+            /* F4      G          F7         H       */
+            0x0102003e 0x01030022 0x01040041 0x01060023
+            /* '       F9         BKSPACE    L_CTRL  */
+            0x01080028 0x01090043 0x010b000e 0x0200001d
+            /* TAB     F3         T          F6      */
+            0x0201000f 0x0202003d 0x02030014 0x02040040
+            /* ]       Y          102ND      [       */
+            0x0205001b 0x02060015 0x02070056 0x0208001a
+            /* F8      GRAVE      F2         5       */
+            0x02090042 0x03010029 0x0302003c 0x03030006
+            /* F5      6          -          \       */
+            0x0304003f 0x03060007 0x0308000c 0x030b002b
+            /* R_CTRL  A          D          F       */
+            0x04000061 0x0401001e 0x04020020 0x04030021
+            /* S       K          J          ;       */
+            0x0404001f 0x04050025 0x04060024 0x04080027
+            /* L       ENTER      Z          C       */
+            0x04090026 0x040b001c 0x0501002c 0x0502002e
+            /* V       X          ,          M       */
+            0x0503002f 0x0504002d 0x05050033 0x05060032
+            /* L_SHIFT /          .          SPACE   */
+            0x0507002a 0x05080035 0x05090034 0x050B0039
+            /* 1       3          4          2       */
+            0x06010002 0x06020004 0x06030005 0x06040003
+            /* 8       7          0          9       */
+            0x06050009 0x06060008 0x0608000b 0x0609000a
+            /* L_ALT   DOWN       RIGHT      Q       */
+            0x060a0038 0x060b006c 0x060c006a 0x07010010
+            /* E       R          W          I       */
+            0x07020012 0x07030013 0x07040011 0x07050017
+            /* U       R_SHIFT    P          O       */
+            0x07060016 0x07070036 0x07080019 0x07090018
+            /* UP      LEFT    */
+            0x070b0067 0x070c0069>;
+    };

Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml

@@ -71,6 +71,9 @@ properties:
   wakeup-source:
     description: Button can wake-up the system.
 
+  keyboard-controller:
+    $ref: "/schemas/input/google,cros-ec-keyb.yaml#"
+
 patternProperties:
   "^i2c-tunnel[0-9]*$":
     type: object