dt-bindings: net: can: atmel: Convert to json schema

Convert old text based binding to json schema.
Changes during conversion:
- Add a fallback for `microchip,sam9x60-can` as it is compatible with the
  CAN IP core on `atmel,at91sam9x5-can`.
- Add the required properties `clock` and `clock-names`, which were
  missing in the original binding.
- Update examples and include appropriate file directives to resolve
  errors identified by `dt_binding_check` and `dtbs_check`.

Signed-off-by: Charan Pedumuru <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
[mkl: fixed indention in example]
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: Charan-Pedumuru

Documentation/devicetree/bindings/net/can/atmel,at91sam9263-can.yaml

@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/atmel,at91sam9263-can.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip AT91 CAN Controller
+
+maintainers:
+  - Nicolas Ferre <[email protected]>
+
+allOf:
+  - $ref: can-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - atmel,at91sam9263-can
+          - atmel,at91sam9x5-can
+      - items:
+          - enum:
+              - microchip,sam9x60-can
+          - const: atmel,at91sam9x5-can
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: can_clk
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/at91.h>
+    can@f000c000 {
+          compatible = "atmel,at91sam9263-can";
+          reg = <0xf000c000 0x300>;
+          interrupts = <30 IRQ_TYPE_LEVEL_HIGH 3>;
+          clocks = <&pmc PMC_TYPE_PERIPHERAL 12>;
+          clock-names = "can_clk";
+    };