[PATCH V2 RESEND] dt-bindings: firmware: imx95-scmi: Allow linux,code for protocol at 81

[Peng Fan]

From: Alexander Stein <alexander.stein at ew.tq-group.com>

BBM protocol supports a single power button, supported by driver
imx-sm-bbm-key.c. By default this is KEY_POWER, but can also be overwritten
using linux,code. Add a reference to this schema and add linux,code as a
supported property.

Reviewed-by: Rob Herring (Arm) <robh at kernel.org>
Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---

Resend [1].
I not see a reason that why this patch could block i.MX95 remoteproc support[2].
But to speed up the work, I took Alexander's work and resend it. Hope this
could catch 6.17

[1]https://lore.kernel.org/imx/20250513-whimsical-almond-quoll-e3ad5b@sudeepholla/
[2]https://lore.kernel.org/linux-remoteproc/PAXPR04MB8459A0F330554EB69E990E048850A@PAXPR04MB8459.eurprd04.prod.outlook.com/T/#t

 .../devicetree/bindings/firmware/nxp,imx95-scmi.yaml   | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi.yaml b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi.yaml
index 2bda2e0e1369..7a5a02da2719 100644
--- a/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi.yaml
@@ -24,13 +24,19 @@ properties:
         const: 0x80
 
   protocol at 81:
-    $ref: '/schemas/firmware/arm,scmi.yaml#/$defs/protocol-node'
-    unevaluatedProperties: false
+    type: object
+    allOf:
+      - $ref: '/schemas/firmware/arm,scmi.yaml#/$defs/protocol-node'
+      - $ref: /schemas/input/input.yaml#
+    additionalProperties: false
 
     properties:
       reg:
         const: 0x81
 
+      linux,code:
+        default: 116  # KEY_POWER
+
   protocol at 82:
     description:
       SCMI CPU Protocol which allows an agent to start or stop a CPU. It is
-- 
2.37.1