dt-bindings: serial: renesas,rsci: Document RZ/G3E support

Add documentation for the serial communication interface (RSCI) found on
the Renesas RZ/G3E (R9A09G047) SoC. The RSCI IP on this SoC is identical
to that on the RZ/T2H (R9A09G077) SoC, but it has a 32-stage FIFO compared
to 16 on RZ/T2H. It supports both FIFO and non-FIFO mode operation. RZ/G3E
has 6 clocks(5 module clocks + 1 external clock) compared to 3 clocks
(2 module clocks + 1 external clock) on RZ/T2H, and it has multiple resets.
It has 6 interrupts compared to 4 on RZ/T2H.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://patch.msgid.link/20251129164325.209213-2-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
index 6b1f827a335b3724f141f32dc15b3d3a6dee775a..1f8cee8171de3a13ecb8bb651110909bcfa35a5c 100644 (file)
--- a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
+++ b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
@@ -10,46 +10,72 @@ maintainers:
   - Geert Uytterhoeven <geert+renesas@glider.be>
   - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
 
-allOf:
-  - $ref: serial.yaml#
-
 properties:
   compatible:
     oneOf:
-      - items:
-          - const: renesas,r9a09g087-rsci # RZ/N2H
-          - const: renesas,r9a09g077-rsci # RZ/T2H
+      - enum:
+          - renesas,r9a09g047-rsci # RZ/G3E
+          - renesas,r9a09g077-rsci # RZ/T2H
 
       - items:
+          - const: renesas,r9a09g087-rsci # RZ/N2H
           - const: renesas,r9a09g077-rsci # RZ/T2H
 
   reg:
     maxItems: 1
 
   interrupts:
+    minItems: 4
     items:
       - description: Error interrupt
       - description: Receive buffer full interrupt
       - description: Transmit buffer empty interrupt
       - description: Transmit end interrupt
+      - description: Active edge detection interrupt
+      - description: Break field detection interrupt
 
   interrupt-names:
+    minItems: 4
     items:
       - const: eri
       - const: rxi
       - const: txi
       - const: tei
+      - const: aed
+      - const: bfd
 
   clocks:
     minItems: 2
-    maxItems: 3
+    maxItems: 6
 
   clock-names:
-    minItems: 2
+    oneOf:
+      - items:
+          - const: operation
+          - const: bus
+          - const: sck # optional external clock input
+
+        minItems: 2
+
+      - items:
+          - const: pclk
+          - const: tclk
+          - const: tclk_div4
+          - const: tclk_div16
+          - const: tclk_div64
+          - const: sck # optional external clock input
+
+        minItems: 5
+
+  resets:
     items:
-      - const: operation
-      - const: bus
-      - const: sck # optional external clock input
+      - description: Input for resetting the APB clock
+      - description: Input for resetting TCLK
+
+  reset-names:
+    items:
+      - const: presetn
+      - const: tresetn
 
   power-domains:
     maxItems: 1
@@ -62,6 +88,57 @@ required:
   - clock-names
   - power-domains
 
+allOf:
+  - $ref: serial.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g077-rsci
+    then:
+      properties:
+        interrupts:
+          maxItems: 4
+
+        interrupt-names:
+          maxItems: 4
+
+        clocks:
+          minItems: 2
+          maxItems: 3
+
+        clock-names:
+          minItems: 2
+          maxItems: 3
+
+        resets: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g047-rsci
+    then:
+      properties:
+        interrupts:
+          minItems: 6
+
+        interrupt-names:
+          minItems: 6
+
+        clocks:
+          minItems: 5
+          maxItems: 6
+
+        clock-names:
+          minItems: 5
+          maxItems: 6
+
+      required:
+        - resets
+        - reset-names
+
 unevaluatedProperties: false
 
 examples: