[PATCH v2 2/6] dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

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.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v1->v2:
 * Updated commit description.
 * Added an example for RZ/N1D SJA1000 usage
---
 .../bindings/net/can/nxp,sja1000.yaml         | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
index 3232ce7e2642..dca2c932df31 100644
--- a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
+++ b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
@@ -20,6 +20,15 @@ allOf:
     then:
       required:
         - reg-io-width
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,rzn1-sja1000
+    then:
+      required:
+        - clocks
+        - clock-names
 
 properties:
   compatible:
@@ -28,6 +37,12 @@ properties:
         const: nxp,sja1000
       - description: Technologic Systems SJA1000 CAN Controller
         const: technologic,sja1000
+      - description: Renesas RZ/N1 SJA1000 CAN Controller
+        items:
+          - enum:
+              - renesas,r9a06g032-sja1000 # RZ/N1D
+              - renesas,r9a06g033-sja1000 # RZ/N1S
+          - const: renesas,rzn1-sja1000 # RZ/N1
 
   reg:
     maxItems: 1
@@ -35,6 +50,12 @@ properties:
   interrupts:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: can_clk
+
   reg-io-width:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: I/O register width (in bytes) implemented by this device
@@ -100,3 +121,16 @@ examples:
             interrupts = <1>;
             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>;
+            clock-names = "can_clk";
+    };
-- 
2.25.1