linux-kernel - [PATCH v6 1/2] dt-bindings: input: cros-ec-keyb: Add a new property

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Date:   Thu, 14 Jan 2021 18:30:30 -0800
From:   Philip Chen <philipchen@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>, dmitry.torokhov@...il.com
Cc:     swboyd@...omium.org, dianders@...omium.org,
        Philip Chen <philipchen@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Simon Glass <sjg@...omium.org>, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: [PATCH v6 1/2] dt-bindings: input: cros-ec-keyb: Add a new property

Add a new property `function-row-physmap` to the
device tree for the custom keyboard top row design.

The property describes the rows/columns of the top row keys
from left to right.

Signed-off-by: Philip Chen <philipchen@...omium.org>
---

Changes in v6:
- remove $ref and add `function-row-physmap` to the example

Changes in v5:
- add minItems and maxItems for `function-row-physmap`

Changes in v2:
- add `function-row-physmap` instead of `google,custom-keyb-top-row`

 .../bindings/input/google,cros-ec-keyb.yaml   | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
index 8e50c14a9d778..a742b0777ee6d 100644
--- a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
+++ b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
@@ -31,6 +31,17 @@ properties:
       if the EC does not have its own logic or hardware for this.
     type: boolean
 
+  function-row-physmap:
+    minItems: 1
+    maxItems: 15
+    description: |
+      An ordered u32 array describing the rows/columns (in the scan matrix)
+      of top row keys from physical left (KEY_F1) to right. Each entry
+      encodes the row/column as:
+      (((row) & 0xFF) << 24) | (((column) & 0xFF) << 16)
+      where the lower 16 bits are reserved. This property is specified only
+      when the keyboard has a custom design for the top row keys.
+
 required:
   - compatible
 
@@ -43,6 +54,18 @@ examples:
         keypad,num-rows = <8>;
         keypad,num-columns = <13>;
         google,needs-ghost-filter;
+        function-row-physmap = <
+                0x00020000      /* T1 */
+                0x03020000      /* T2 */
+                0x02020000      /* T3 */
+                0x01020000      /* T4 */
+                0x03040000      /* T5 */
+                0x02040000      /* T6 */
+                0x01040000      /* T7 */
+                0x02090000      /* T8 */
+                0x01090000      /* T9 */
+                0x00040000      /* T10 */
+        >;
         /*
          * Keymap entries take the form of 0xRRCCKKKK where
          * RR=Row CC=Column KKKK=Key Code
-- 
2.26.2