dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support

Add CAN binding documentation for Renesas RZ/N1 SoC.

The SJA1000 CAN controller on RZ/N1 SoC has some differences compared
to others like it has no clock divider register (CDR) support and it has
no HW loopback (HW doesn't see tx messages on rx), so introduced a new
compatible 'renesas,rzn1-sja1000' to handle these differences.

Link: https://lore.kernel.org/all/20220710115248.190280-3-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
index ca9bfdf..b1327c5 100644 (file)
--- a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
+++ b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
@@ -11,9 +11,15 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - nxp,sja1000
-      - technologic,sja1000
+    oneOf:
+      - enum:
+          - nxp,sja1000
+          - technologic,sja1000
+      - items:
+          - enum:
+              - renesas,r9a06g032-sja1000 # RZ/N1D
+              - renesas,r9a06g033-sja1000 # RZ/N1S
+          - const: renesas,rzn1-sja1000 # RZ/N1
 
   reg:
     maxItems: 1
@@ -21,6 +27,9 @@ properties:
   interrupts:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
   reg-io-width:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: I/O register width (in bytes) implemented by this device
@@ -82,10 +91,20 @@ allOf:
       properties:
         compatible:
           contains:
-            const: technologic,sja1000
+            enum:
+              - technologic,sja1000
+              - renesas,rzn1-sja1000
     then:
       required:
         - reg-io-width
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,rzn1-sja1000
+    then:
+      required:
+        - clocks
 
 unevaluatedProperties: false
 
@@ -99,3 +118,15 @@ examples:
         nxp,tx-output-config = <0x06>;
         nxp,external-clock-frequency = <24000000>;
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/r9a06g032-sysctrl.h>
+
+    can@52104000 {
+        compatible = "renesas,r9a06g032-sja1000", "renesas,rzn1-sja1000";
+        reg = <0x52104000 0x800>;
+        reg-io-width = <4>;
+        interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&sysctrl R9A06G032_HCLK_CAN0>;
+    };