WIP: device tree MVP

dts/bindings/mmc/mmc.yaml

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+# Copyright (c) 2019, NXP
+# SPDX-License-Identifier: Apache-2.0
+
+# Specifies the MMC/SDHC module
+
+include: base.yaml

dts/bindings/mmc/nxp,imx-usdhc.yaml

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+# Copyright (c) 2019, NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: NXP i.MXRT USDHC module
+
+compatible: "nxp,imx-usdhc"
+
+include: mmc.yaml
+
+properties:
+    clocks:
+      required: true
+
+    pwr-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Power pin
+        This pin defaults to active high when consumed by the SD card. The
+        property value should ensure the flags properly describe the signal
+        that is presented to the driver.
+
+    cd-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Detect pin
+        This pin defaults to active low when produced by the SD card. The
+        property value should ensure the flags properly describe the signal
+        that is presented to the driver.
+
+    no-1-8-v:
+      type: boolean
+      required: false
+      description: |
+        When the external SD card circuit does not support 1.8V, add this
+        property to disable 1.8v card voltage of SD card controller.
+
+    detect-dat3:
+      type: boolean
+      required: false
+      description: |
+        Enable the host to detect an SD card via the DAT3 line of the SD card
+        connection. Requires the board to define a function to pull DAT3 low or
+        high using pullup/pulldown resistors.
+
+    label:
+      required: true

dts/bindings/mmc/st,stm32-sdmmc.yaml

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+description: stm32 sdmmc disk access
+
+compatible: "st,stm32-sdmmc"
+
+include: [mmc.yaml, pinctrl-device.yaml]
+
+properties:
+    clocks:
+        required: true
+
+    label:
+        required: true
+
+    reg:
+        required: true
+
+    pinctrl-0:
+      required: true
+
+    pinctrl-names:
+      required: true
+
+    cd-gpios:
+        type: phandle-array
+        required: false
+        description: Card Detect pin
+
+    pwr-gpios:
+        type: phandle-array
+        required: false
+        description: Power pin

dts/bindings/mmc/zephyr,mmc-spi-slot.yaml

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+# Copyright (c) 2018 Google LLC.
+# SPDX-License-Identifier: Apache-2.0
+
+description: MMC/SD/SDIO slot connected via SPI
+
+compatible: "zephyr,mmc-spi-slot"
+
+include: spi-device.yaml