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diff --git a/Documentation/devicetree/bindings/mmc/mmc-spi-slot.yaml b/Documentation/devicetree/bindings/mmc/mmc-spi-slot.yaml
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+# 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>;
+      };
+    };
+
+...