[PATCH v4 5/8] dt-bindings: i2c: realtek,rtl9301-i2c: extend for clocks and RTL9607C support

[Rustam Adilov <adilov@disroot.org>]

Add the "realtek,rtl9607-i2c" compatible for i2c controller on the
RTL9607C SoC series.

Add a clocks property to the properties to describe the i2c reference
clock and make it available for all the compatibles. This i2c reference
clock is assumed to be coming from switchcore region via Lexra bus as
the other SoC peripherals.

RTL9607C requires the "realtek,scl" and "clocks" to be specified
and so handle it under separate if check for "realtek,rtl9607-i2c".

Signed-off-by: Rustam Adilov <adilov@disroot.org>
---
 .../bindings/i2c/realtek,rtl9301-i2c.yaml         | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml b/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
index f9a449fee2b0..5873cfdc5b3e 100644
--- a/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
@@ -15,6 +15,8 @@ description:
   assigned to either I2C controller.
   RTL9310 SoCs have equal capabilities but support 12 common SDA lines which
   can be assigned to either I2C controller.
+  RTL9607C SoCs have equal capabilities but each controller only supports 1
+  SCL/SDA line.
 
 properties:
   compatible:
@@ -34,6 +36,7 @@ properties:
       - enum:
           - realtek,rtl9301-i2c
           - realtek,rtl9310-i2c
+          - realtek,rtl9607-i2c
 
   reg:
     items:
@@ -51,6 +54,9 @@ properties:
       The SCL line number of this I2C controller.
     enum: [ 0, 1 ]
 
+  clocks:
+    maxItems: 1
+
 patternProperties:
   '^i2c@[0-9ab]$':
     $ref: /schemas/i2c/i2c-controller.yaml
@@ -81,6 +87,15 @@ allOf:
     then:
       patternProperties:
         '^i2c@[89ab]$': false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: realtek,rtl9607-i2c
+    then:
+      required:
+        - realtek,scl
+        - clocks
 
 required:
   - compatible
-- 
2.53.0