[PATCH v4 1/2] dt-bindings: serial: renesas,em-uart: Add RZ/V2M clock to access the registers

[Phil Edworthy <phil.edworthy@xxxxxxxxxxx>]

The RZ/V2M SoC has an additional clock to access the registers. The HW
manual says this clock should not be touched as it is used by the
"ISP Firmware".

Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v4:
 - Removed "optional" from description of clock to access the registers
v3:
 - New patch added
---
 .../bindings/serial/renesas,em-uart.yaml      | 32 +++++++++++++++----
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml b/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml
index 332c385618e1..40a03f255666 100644
--- a/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml
@@ -9,9 +9,6 @@ title: Renesas EMMA Mobile UART Interface
 maintainers:
   - Magnus Damm <magnus.damm@xxxxxxxxx>
 
-allOf:
-  - $ref: serial.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -29,11 +26,32 @@ properties:
   interrupts:
     maxItems: 1
 
-  clocks:
-    maxItems: 1
+allOf:
+  - $ref: serial.yaml#
 
-  clock-names:
-    const: sclk
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g011-uart
+    then:
+      properties:
+        clocks:
+          items:
+            - description: UART functional clock
+            - description: Internal clock to access the registers
+        clock-names:
+          items:
+            - const: sclk
+            - const: pclk
+    else:
+      properties:
+        clocks:
+          items:
+            - description: UART functional clock
+        clock-names:
+          items:
+            - const: sclk
 
 required:
   - compatible
-- 
2.32.0