[PATCH 1/2] dt-bindings: google,cros-ec-keyb: Introduce switches only compatible

[Stephen Boyd <swboyd@chromium.org>]

If the device is a detachable, this device won't have a matrix keyboard
but it may have some button switches, e.g. volume buttons and power
buttons. Let's add a more specific compatible for this type of device
that indicates to the OS that there are only switches and no matrix
keyboard present.

Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: <devicetree@vger.kernel.org>
Cc: Benson Leung <bleung@chromium.org>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: "Joseph S. Barrera III" <joebar@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 .../bindings/input/google,cros-ec-keyb.yaml          | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
index e8f137abb03c..edc1194d558d 100644
--- a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
+++ b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
@@ -15,14 +15,20 @@ 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.
+  into keycodes for processing by the kernel. This device also supports
+  switches/buttons like power and volume buttons.
 
 allOf:
   - $ref: "/schemas/input/matrix-keymap.yaml#"
 
 properties:
   compatible:
-    const: google,cros-ec-keyb
+    oneOf:
+      - items:
+          - const: google,cros-ec-keyb-switches
+          - const: google,cros-ec-keyb
+      - items:
+          - const: google,cros-ec-keyb
 
   google,needs-ghost-filter:
     description:
@@ -50,7 +56,7 @@ examples:
   - |
     #include <dt-bindings/input/input.h>
     cros-ec-keyb {
-        compatible = "google,cros-ec-keyb";
+        compatible = "google,cros-ec-keyb-switches", "google,cros-ec-keyb";
         keypad,num-rows = <8>;
         keypad,num-columns = <13>;
         google,needs-ghost-filter;
-- 
https://chromeos.dev