dt-bindings: mmc: Convert UniPhier SD controller to json-schema

Convert the UniPhier SD controller binding to DT schema format.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/mmc/socionext,uniphier-sd.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/socionext,uniphier-sd.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: UniPhier SD/SDIO/eMMC controller
+
+maintainers:
+  - Masahiro Yamada <yamada.masahiro@socionext.com>
+
+properties:
+  compatible:
+    description: version 2.91, 3.1, 3.1.1, respectively
+    enum:
+      - socionext,uniphier-sd-v2.91
+      - socionext,uniphier-sd-v3.1
+      - socionext,uniphier-sd-v3.1.1
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  reset-names:
+    description: |
+      There are three reset signals at maximum
+        host:   mandatory for all variants
+        bridge: exist only for version 2.91
+        hw:     optional. exist if eMMC hw reset line is available
+    oneOf:
+      - const: host
+      - items:
+        - const: host
+        - const: bridge
+      - items:
+        - const: host
+        - const: hw
+      - items:
+        - const: host
+        - const: bridge
+        - const: hw
+
+  resets:
+    minItems: 1
+    maxItems: 3
+
+allOf:
+  - $ref: mmc-controller.yaml
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: socionext,uniphier-sd-v2.91
+    then:
+      properties:
+        reset-names:
+          contains:
+            const: bridge
+    else:
+      properties:
+        reset-names:
+          not:
+            contains:
+              const: bridge
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - reset-names
+  - resets
+
+examples:
+  - |
+    sd: mmc@5a400000 {
+        compatible = "socionext,uniphier-sd-v2.91";
+        reg = <0x5a400000 0x200>;
+        interrupts = <0 76 4>;
+        pinctrl-names = "default", "uhs";
+        pinctrl-0 = <&pinctrl_sd>;
+        pinctrl-1 = <&pinctrl_sd_uhs>;
+        clocks = <&mio_clk 0>;
+        reset-names = "host", "bridge";
+        resets = <&mio_rst 0>, <&mio_rst 3>;
+        dma-names = "rx-tx";
+        dmas = <&dmac 4>;
+        bus-width = <4>;
+        cap-sd-highspeed;
+        sd-uhs-sdr12;
+        sd-uhs-sdr25;
+        sd-uhs-sdr50;
+    };

Documentation/devicetree/bindings/mmc/uniphier-sd.txt

-UniPhier SD/eMMC controller
-
-Required properties:
-- compatible: should be one of the following:
-    "socionext,uniphier-sd-v2.91"  - IP version 2.91
-    "socionext,uniphier-sd-v3.1"   - IP version 3.1
-    "socionext,uniphier-sd-v3.1.1" - IP version 3.1.1
-- reg: offset and length of the register set for the device.
-- interrupts: a single interrupt specifier.
-- clocks: a single clock specifier of the controller clock.
-- reset-names: should contain the following:
-    "host"   - mandatory for all versions
-    "bridge" - should exist only for "socionext,uniphier-sd-v2.91"
-    "hw"     - should exist if eMMC hw reset line is available
-- resets: a list of reset specifiers, corresponding to the reset-names
-
-Optional properties:
-- pinctrl-names: if present, should contain the following:
-    "default" - should exist for all instances
-    "uhs"     - should exist for SD instance with UHS support
-- pinctrl-0: pin control state for the default mode
-- pinctrl-1: pin control state for the UHS mode
-- dma-names: should be "rx-tx" if present.
-  This property can exist only for "socionext,uniphier-sd-v2.91".
-- dmas: a single DMA channel specifier
-  This property can exist only for "socionext,uniphier-sd-v2.91".
-- bus-width: see mmc.txt
-- cap-sd-highspeed: see mmc.txt
-- cap-mmc-highspeed: see mmc.txt
-- sd-uhs-sdr12: see mmc.txt
-- sd-uhs-sdr25: see mmc.txt
-- sd-uhs-sdr50: see mmc.txt
-- cap-mmc-hw-reset: should exist if reset-names contains "hw". see mmc.txt
-- non-removable: see mmc.txt
-
-Example:
-
-	sd: sdhc@5a400000 {
-		compatible = "socionext,uniphier-sd-v2.91";
-		reg = <0x5a400000 0x200>;
-		interrupts = <0 76 4>;
-		pinctrl-names = "default", "uhs";
-		pinctrl-0 = <&pinctrl_sd>;
-		pinctrl-1 = <&pinctrl_sd_uhs>;
-		clocks = <&mio_clk 0>;
-		reset-names = "host", "bridge";
-		resets = <&mio_rst 0>, <&mio_rst 3>;
-		dma-names = "rx-tx";
-		dmas = <&dmac 4>;
-		bus-width = <4>;
-		cap-sd-highspeed;
-		sd-uhs-sdr12;
-		sd-uhs-sdr25;
-		sd-uhs-sdr50;
-	};