dt-bindings: mmc: convert mmc-spi-slot to yaml

Convert the mmc-spi-slot text based binding doc to yaml,
with the side effect of cleaning up some of the riscv
dtbs_check warnings.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220606201343.514391-2-mail@conchuod.ieSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt

-MMC/SD/SDIO slot directly connected to a SPI bus
-
-This file documents differences between the core properties described
-by mmc.txt and the properties used by the mmc_spi driver.
-
-Required properties:
-- spi-max-frequency : maximum frequency for this device (Hz).
-
-Optional properties:
-- voltage-ranges : two cells are required, first cell specifies minimum
-  slot voltage (mV), second cell specifies maximum slot voltage (mV).
-  Several ranges could be specified. If not provided, 3.2v..3.4v is assumed.
-- gpios : may specify GPIOs in this order: Card-Detect GPIO,
-  Write-Protect GPIO. Note that this does not follow the
-  binding from mmc.txt, for historical reasons.
-
-Example:
-
-	mmc-slot@0 {
-		compatible = "fsl,mpc8323rdb-mmc-slot",
-			     "mmc-spi-slot";
-		reg = <0>;
-		gpios = <&qe_pio_d 14 1
-			 &qe_pio_d 15 0>;
-		voltage-ranges = <3300 3300>;
-		spi-max-frequency = <50000000>;
-		interrupts = <42>;
-		interrupt-parent = <&PIC>;
-	};

Documentation/devicetree/bindings/mmc/mmc-spi-slot.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/mmc-spi-slot.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MMC/SD/SDIO slot directly connected to a SPI bus
+
+maintainers:
+  - Ulf Hansson <ulf.hansson@linaro.org>
+
+allOf:
+  - $ref: "mmc-controller.yaml"
+  - $ref: /schemas/spi/spi-peripheral-props.yaml
+
+description: |
+  The extra properties used by an mmc connected via SPI.
+
+properties:
+  compatible:
+    const: mmc-spi-slot
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency: true
+
+  interrupts:
+    maxItems: 1
+
+  voltage-ranges:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: |
+      Two cells are required, first cell specifies minimum slot voltage (mV),
+      second cell specifies maximum slot voltage (mV).
+    items:
+      - description: |
+          value for minimum slot voltage in mV
+        default: 3200
+      - description: |
+          value for maximum slot voltage in mV
+        default: 3400
+
+  gpios:
+    description: |
+      For historical reasons, this does not follow the generic mmc-controller
+      binding.
+    minItems: 1
+    items:
+      - description: Card-Detect GPIO
+      - description: Write-Protect GPIO
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      mmc@0 {
+        compatible = "mmc-spi-slot";
+        reg = <0>;
+        gpios = <&gpio 14 GPIO_ACTIVE_LOW>, <&gpio 15 GPIO_ACTIVE_HIGH>;
+        voltage-ranges = <3300 3300>;
+        spi-max-frequency = <50000000>;
+        interrupts = <42>;
+        interrupt-parent = <&PIC>;
+      };
+    };
+
+...