[PATCH RFC 1/2] dt-bindings: media: sony,imx681: Allow a C-PHY bus

[George Neacsu via B4 Relay <devnull+geocausa.gmail.com@kernel.org>]

From: George Neacsu <geocausa@gmail.com>

On the Surface Pro 11 with a Snapdragon X Elite, the IMX681 reaches the
CAMSS CSIPHY over one MIPI C-PHY trio rather than over the two D-PHY
lanes of the Intel model. Let bus-type select C-PHY, and with it a single
data lane, keeping two D-PHY lanes as the default.

Assisted-by: Claude:claude-opus-5-5
Signed-off-by: George Neacsu <geocausa@gmail.com>
---
 .../devicetree/bindings/media/i2c/sony,imx681.yaml | 26 ++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/i2c/sony,imx681.yaml b/Documentation/devicetree/bindings/media/i2c/sony,imx681.yaml
index 62e7eae..51256a7 100644
--- a/Documentation/devicetree/bindings/media/i2c/sony,imx681.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/sony,imx681.yaml
@@ -14,8 +14,8 @@ description:
   The Sony IMX681 is a CMOS active pixel image sensor with a square pixel
   array, used as the user-facing camera on several Microsoft Surface devices.
   It operates from analog 2.8 V, digital 1.05 V and interface 1.8 V supplies,
-  is programmable over I2C, and outputs 10-bit Bayer data over a two-lane
-  MIPI CSI-2 D-PHY interface.
+  is programmable over I2C, and outputs 10-bit Bayer data over MIPI CSI-2,
+  either on two D-PHY lanes or on one C-PHY trio.
 
 allOf:
   - $ref: /schemas/media/video-interface-devices.yaml#
@@ -54,7 +54,14 @@ properties:
         unevaluatedProperties: false
 
         properties:
+          bus-type:
+            enum:
+              - 1 # MEDIA_BUS_TYPE_CSI2_CPHY
+              - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
+            default: 4
+
           data-lanes:
+            minItems: 1
             items:
               - const: 1
               - const: 2
@@ -63,6 +70,21 @@ properties:
           - data-lanes
           - link-frequencies
 
+        if:
+          properties:
+            bus-type:
+              const: 1
+          required:
+            - bus-type
+        then:
+          properties:
+            data-lanes:
+              maxItems: 1
+        else:
+          properties:
+            data-lanes:
+              minItems: 2
+
     required:
       - endpoint
 

-- 
2.53.0