spi: atmel,quadspi: Convert to json-schema

Convert the Atmel QuadSPI controller Device Tree binding documentation
to json-schema.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211209122939.339810-2-tudor.ambarus@microchip.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/atmel,quadspi.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/atmel,quadspi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel Quad Serial Peripheral Interface (QSPI)
+
+maintainers:
+  - Tudor Ambarus <tudor.ambarus@microchip.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - atmel,sama5d2-qspi
+      - microchip,sam9x60-qspi
+
+  reg:
+    items:
+      - description: base registers
+      - description: mapped memory
+
+  reg-names:
+    items:
+      - const: qspi_base
+      - const: qspi_mmap
+
+  clocks:
+    minItems: 1
+    items:
+      - description: peripheral clock
+      - description: system clock, if available
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: pclk
+      - const: qspick
+
+  interrupts:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - clocks
+  - clock-names
+  - '#address-cells'
+  - '#size-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/at91.h>
+    spi@f0020000 {
+        compatible = "atmel,sama5d2-qspi";
+        reg = <0xf0020000 0x100>, <0xd0000000 0x8000000>;
+        reg-names = "qspi_base", "qspi_mmap";
+        interrupts = <52 IRQ_TYPE_LEVEL_HIGH 7>;
+        clocks = <&pmc PMC_TYPE_PERIPHERAL 52>;
+        clock-names = "pclk";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_spi0_default>;
+
+        flash@0 {
+            compatible = "jedec,spi-nor";
+            spi-max-frequency = <50000000>;
+            reg = <0>;
+            spi-rx-bus-width = <4>;
+            spi-tx-bus-width = <4>;
+        };
+    };

Documentation/devicetree/bindings/spi/atmel-quadspi.txt

-* Atmel Quad Serial Peripheral Interface (QSPI)
-
-Required properties:
-- compatible:     Should be one of the following:
-		  - "atmel,sama5d2-qspi"
-		  - "microchip,sam9x60-qspi"
-- reg:            Should contain the locations and lengths of the base registers
-                  and the mapped memory.
-- reg-names:      Should contain the resource reg names:
-                  - qspi_base: configuration register address space
-                  - qspi_mmap: memory mapped address space
-- interrupts:     Should contain the interrupt for the device.
-- clocks:         Should reference the peripheral clock and the QSPI system
-                  clock if available.
-- clock-names:    Should contain "pclk" for the peripheral clock and "qspick"
-                  for the system clock when available.
-- #address-cells: Should be <1>.
-- #size-cells:    Should be <0>.
-
-Example:
-
-spi@f0020000 {
-	compatible = "atmel,sama5d2-qspi";
-	reg = <0xf0020000 0x100>, <0xd0000000 0x8000000>;
-	reg-names = "qspi_base", "qspi_mmap";
-	interrupts = <52 IRQ_TYPE_LEVEL_HIGH 7>;
-	clocks = <&pmc PMC_TYPE_PERIPHERAL 52>;
-	clock-names = "pclk";
-	#address-cells = <1>;
-	#size-cells = <0>;
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_spi0_default>;
-
-	m25p80@0 {
-		...
-	};
-};