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diff --git a/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt b/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
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+++ b/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
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+MMC/SD/SDIO slot directly connected to a SPI bus
+
+Required properties:
+- compatible : should be "mmc-spi-slot".
+- reg : should specify SPI address (chip-select number).
+- spi-max-frequency : maximum frequency for this device (Hz).
+- 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.
+- gpios : (optional) may specify GPIOs in this order: Card-Detect GPIO,
+  Write-Protect GPIO.
+
+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>;
+        };