dt-bindings: net: can: c_can: convert to json-schema

Convert the Bosch C_CAN/D_CAN controller device tree binding
documentation to json-schema.

Document missing properties.
Remove "ti,hwmods" as it is no longer used in TI dts.
Make "clocks" required as it is used in all dts.
Update the examples.

Link: https://lore.kernel.org/r/20210805192750.9051-1-dariobin@libero.itSigned-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/bosch,c_can.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/bosch,c_can.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bosch C_CAN/D_CAN controller Device Tree Bindings
+
+description: Bosch C_CAN/D_CAN controller for CAN bus
+
+maintainers:
+  - Dario Binacchi <dariobin@libero.it>
+
+allOf:
+  - $ref: can-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - bosch,c_can
+          - bosch,d_can
+          - ti,dra7-d_can
+          - ti,am3352-d_can
+      - items:
+          - enum:
+              - ti,am4372-d_can
+          - const: ti,am3352-d_can
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    maxItems: 4
+
+  power-domains:
+    description: |
+      Should contain a phandle to a PM domain provider node and an args
+      specifier containing the DCAN device id value. It's mandatory for
+      Keystone 2 66AK2G SoCs only.
+    maxItems: 1
+
+  clocks:
+    description: |
+      CAN functional clock phandle.
+    maxItems: 1
+
+  clock-names:
+    maxItems: 1
+
+  syscon-raminit:
+    description: |
+      Handle to system control region that contains the RAMINIT register,
+      register offset to the RAMINIT register and the CAN instance number (0
+      offset).
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      items:
+        - description: The phandle to the system control region.
+        - description: The register offset.
+        - description: The CAN instance number.
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - bosch,d_can
+
+then:
+  properties:
+    interrupts:
+      minItems: 4
+      maxItems: 4
+      items:
+        - description: Error and status IRQ
+        - description: Message object IRQ
+        - description: RAM ECC correctable error IRQ
+        - description: RAM ECC non-correctable error IRQ
+
+else:
+  properties:
+    interrupts:
+      maxItems: 1
+      items:
+        - description: Error and status IRQ
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/reset/altr,rst-mgr.h>
+
+    can@ffc00000 {
+       compatible = "bosch,d_can";
+       reg = <0xffc00000 0x1000>;
+       interrupts = <0 131 4>, <0 132 4>, <0 133 4>, <0 134 4>;
+       clocks = <&can0_clk>;
+       resets = <&rst CAN0_RESET>;
+    };
+  - |
+    can@0 {
+        compatible = "ti,am3352-d_can";
+        reg = <0x0 0x2000>;
+        clocks = <&dcan1_fck>;
+        clock-names = "fck";
+        syscon-raminit = <&scm_conf 0x644 1>;
+        interrupts = <55>;
+    };

Documentation/devicetree/bindings/net/can/c_can.txt

-Bosch C_CAN/D_CAN controller Device Tree Bindings
--------------------------------------------------
-
-Required properties:
-- compatible		: Should be "bosch,c_can" for C_CAN controllers and
-			  "bosch,d_can" for D_CAN controllers.
-			  Can be "ti,dra7-d_can", "ti,am3352-d_can" or
-			  "ti,am4372-d_can".
-- reg			: physical base address and size of the C_CAN/D_CAN
-			  registers map
-- interrupts		: property with a value describing the interrupt
-			  number
-
-The following are mandatory properties for DRA7x, AM33xx and AM43xx SoCs only:
-- ti,hwmods		: Must be "d_can<n>" or "c_can<n>", n being the
-			  instance number
-
-The following are mandatory properties for Keystone 2 66AK2G SoCs only:
-- power-domains		: Should contain a phandle to a PM domain provider node
-			  and an args specifier containing the DCAN device id
-			  value. This property is as per the binding,
-			  Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml
-- clocks		: CAN functional clock phandle. This property is as per the
-			  binding,
-			  Documentation/devicetree/bindings/clock/ti,sci-clk.yaml
-
-Optional properties:
-- syscon-raminit	: Handle to system control region that contains the
-			  RAMINIT register, register offset to the RAMINIT
-			  register and the CAN instance number (0 offset).
-
-Note: "ti,hwmods" field is used to fetch the base address and irq
-resources from TI, omap hwmod data base during device registration.
-Future plan is to migrate hwmod data base contents into device tree
-blob so that, all the required data will be used from device tree dts
-file.
-
-Example:
-
-Step1: SoC common .dtsi file
-
-	dcan1: d_can@481d0000 {
-		compatible = "bosch,d_can";
-		reg = <0x481d0000 0x2000>;
-		interrupts = <55>;
-		interrupt-parent = <&intc>;
-		status = "disabled";
-	};
-
-(or)
-
-	dcan1: d_can@481d0000 {
-		compatible = "bosch,d_can";
-		ti,hwmods = "d_can1";
-		reg = <0x481d0000 0x2000>;
-		interrupts = <55>;
-		interrupt-parent = <&intc>;
-		status = "disabled";
-	};
-
-Step 2: board specific .dts file
-
-	&dcan1 {
-		status = "okay";
-	};