dt-bindings: mtd: convert vf610-nfc to yaml format

Convert binding doc vf610-nfc to yaml format.

Additional changes:
- ref to nand-controller.yaml.
- include arm-gic.h and vf610-clock.h in examples.
- add clocks and clock-names description.
- remove #address-cells, #size-cells assigned-clocks and
assigned-clock-rates.

Signed-off-by: Frank Li <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>

Documentation/devicetree/bindings/mtd/fsl,vf610-nfc.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/fsl,vf610-nfc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale's NAND flash controller (NFC)
+
+description:
+  This variant of the Freescale NAND flash controller (NFC) can be found on
+  Vybrid (vf610), MPC5125, MCF54418 and Kinetis K70.
+
+maintainers:
+  - Frank Li <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - fsl,vf610-nfc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: nfc
+
+patternProperties:
+  "^nand@[a-f0-9]$":
+    type: object
+    $ref: raw-nand-chip.yaml
+
+    properties:
+      compatible:
+        const: fsl,vf610-nfc-nandcs
+
+      reg:
+        const: 0
+
+      nand-ecc-strength:
+        enum: [24, 32]
+
+      nand-ecc-step-size:
+        const: 2048
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+allOf:
+  - $ref: nand-controller.yaml
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/vf610-clock.h>
+
+    nand-controller@400e0000 {
+        compatible = "fsl,vf610-nfc";
+        reg = <0x400e0000 0x4000>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clks VF610_CLK_NFC>;
+        clock-names = "nfc";
+        assigned-clocks = <&clks VF610_CLK_NFC>;
+        assigned-clock-rates = <33000000>;
+
+        nand@0 {
+            compatible = "fsl,vf610-nfc-nandcs";
+            reg = <0>;
+            nand-bus-width = <8>;
+            nand-ecc-mode = "hw";
+            nand-ecc-strength = <32>;
+            nand-ecc-step-size = <2048>;
+            nand-on-flash-bbt;
+        };
+    };

Documentation/devicetree/bindings/mtd/vf610-nfc.txt

···
-Freescale's NAND flash controller (NFC)
-
-This variant of the Freescale NAND flash controller (NFC) can be found on
-Vybrid (vf610), MPC5125, MCF54418 and Kinetis K70.
-
-Required properties:
-- compatible: Should be set to "fsl,vf610-nfc".
-- reg: address range of the NFC.
-- interrupts: interrupt of the NFC.
-- #address-cells: shall be set to 1. Encode the nand CS.
-- #size-cells : shall be set to 0.
-- assigned-clocks: main clock from the SoC, for Vybrid <&clks VF610_CLK_NFC>;
-- assigned-clock-rates: The NAND bus timing is derived from this clock
-    rate and should not exceed maximum timing for any NAND memory chip
-    in a board stuffing. Typical NAND memory timings derived from this
-    clock are found in the SoC hardware reference manual. Furthermore,
-    there might be restrictions on maximum rates when using hardware ECC.
-
-- #address-cells, #size-cells : Must be present if the device has sub-nodes
-  representing partitions.
-
-Required children nodes:
-Children nodes represent the available nand chips. Currently the driver can
-only handle one NAND chip.
-
-Required properties:
-- compatible: Should be set to "fsl,vf610-nfc-cs".
-- nand-bus-width: see nand-controller.yaml
-- nand-ecc-mode: see nand-controller.yaml
-
-Required properties for hardware ECC:
-- nand-ecc-strength: supported strengths are 24 and 32 bit (see nand-controller.yaml)
-- nand-ecc-step-size: step size equals page size, currently only 2k pages are
-    supported
-- nand-on-flash-bbt: see nand-controller.yaml
-
-Example:
-
-	nfc: nand@400e0000 {
-		compatible = "fsl,vf610-nfc";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0x400e0000 0x4000>;
-		interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&clks VF610_CLK_NFC>;
-		clock-names = "nfc";
-		assigned-clocks = <&clks VF610_CLK_NFC>;
-		assigned-clock-rates = <33000000>;
-
-		nand@0 {
-			compatible = "fsl,vf610-nfc-nandcs";
-			reg = <0>;
-			nand-bus-width = <8>;
-			nand-ecc-mode = "hw";
-			nand-ecc-strength = <32>;
-			nand-ecc-step-size = <2048>;
-			nand-on-flash-bbt;
-		};
-	};