dt-bindings: mmc: samsung,s3c6410-sdhci: convert to dtschema

Convert the Samsung SoC SDHCI Controller bindings to DT schema.

The original bindings were quite old and incomplete, so add during
conversion typical (already used) properties like reg, clocks,
interrupts.

The bindings were not precising the clocks, although the upstream DTS
and Linux driver were expecting bus clocks in certain patterns in any
order. Document the status quo even though it is not a proper approach
for bindings.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

Documentation/devicetree/bindings/mmc/samsung,s3c6410-sdhci.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/samsung,s3c6410-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung SoC SDHCI Controller
+
+maintainers:
+  - Jaehoon Chung <[e-mail]>
+  - Krzysztof Kozlowski <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - samsung,s3c6410-sdhci
+      - samsung,exynos4210-sdhci
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    maxItems: 5
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: hsmmc
+      - pattern: "^mmc_busclk.[0-3]$"
+      - pattern: "^mmc_busclk.[0-3]$"
+      - pattern: "^mmc_busclk.[0-3]$"
+      - pattern: "^mmc_busclk.[0-3]$"
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+allOf:
+  - $ref: mmc-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,exynos4210-sdhci
+    then:
+      properties:
+        clocks:
+          maxItems: 2
+        clock-names:
+          items:
+            - const: hsmmc
+            - const: mmc_busclk.2
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/exynos4.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    mmc@12510000 {
+        compatible = "samsung,exynos4210-sdhci";
+        reg = <0x12510000 0x100>;
+        interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clock CLK_SDMMC0>, <&clock CLK_SCLK_MMC0>;
+        clock-names = "hsmmc", "mmc_busclk.2";
+        bus-width = <4>;
+        cd-gpios = <&gpx3 4 GPIO_ACTIVE_LOW>;
+        pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4 &sdhci2_cd>;
+        pinctrl-names = "default";
+        vmmc-supply = <&ldo21_reg>;
+    };

Documentation/devicetree/bindings/mmc/samsung-sdhci.txt

···
-* Samsung's SDHCI Controller device tree bindings
-
-Samsung's SDHCI controller is used as a connectivity interface with external
-MMC, SD and eMMC storage mediums. This file documents differences between the
-core mmc properties described by mmc.txt and the properties used by the
-Samsung implementation of the SDHCI controller.
-
-Required SoC Specific Properties:
-- compatible: should be one of the following
-  - "samsung,s3c6410-sdhci": For controllers compatible with s3c6410 sdhci
-    controller.
-  - "samsung,exynos4210-sdhci": For controllers compatible with Exynos4 sdhci
-    controller.
-
-Required Board Specific Properties:
-- pinctrl-0: Should specify pin control groups used for this controller.
-- pinctrl-names: Should contain only one value - "default".
-
-Example:
-	sdhci@12530000 {
-		compatible = "samsung,exynos4210-sdhci";
-		reg = <0x12530000 0x100>;
-		interrupts = <0 75 0>;
-		bus-width = <4>;
-		cd-gpios = <&gpk2 2 0>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus4>;
-	};
-
-	Note: This example shows both SoC specific and board specific properties
-	in a single device node. The properties can be actually be separated
-	into SoC specific node and board specific node.