dt-bindings: mmc: sdhci-of-dwcmhsc: Convert to yaml file

This patch converts sdhci-of-dwcmshc.txt to sdhci-of-dwcmshc.yaml
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1615879102-45919-1-git-send-email-shawn.lin@rock-chips.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/sdhci-of-dwcmshc.txt

-* Synopsys DesignWare Cores Mobile Storage Host Controller
-
-Required properties:
-- compatible: should be one of the following:
-    "snps,dwcmshc-sdhci"
-- reg: offset and length of the register set for the device.
-- interrupts: a single interrupt specifier.
-- clocks: Array of clocks required for SDHCI; requires at least one for
-    core clock.
-- clock-names: Array of names corresponding to clocks property; shall be
-    "core" for core clock and "bus" for optional bus clock.
-
-Example:
-	sdhci2: sdhci@aa0000 {
-		compatible = "snps,dwcmshc-sdhci";
-		reg = <0xaa0000 0x1000>;
-		interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&emmcclk>;
-		bus-width = <8>;
-	}

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml

+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/snps,dwcmshc-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys Designware Mobile Storage Host Controller Binding
+
+maintainers:
+  - Ulf Hansson <ulf.hansson@linaro.org>
+  - Jisheng Zhang <Jisheng.Zhang@synaptics.com>
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - snps,dwcmshc-sdhci
+
+  reg:
+    minItems: 1
+    items:
+      - description: Offset and length of the register set for the device
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: core clock
+      - description: bus clock for optional
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: core
+      - const: bus
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    mmc@aa0000 {
+      compatible = "snps,dwcmshc-sdhci";
+      reg = <0xaa000 0x1000>;
+      interrupts = <0 25 0x4>;
+      clocks = <&cru 17>, <&cru 18>;
+      clock-names = "core", "bus";
+      bus-width = <8>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
+
+...