dts: sdhc: Add SDHC DTS bindings

Add generic SDHC dts binding, as well as DTS binding for NXP USDHC.
Update iMX.RT DTS binding to use USDHC compatible

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

dts/arm/nxp/nxp_rt.dtsi

@@ -680,21 +680,29 @@
 		};
 
 		usdhc1: usdhc@402c0000 {
-			compatible = "nxp,imx-usdhc";
+			compatible = "nxp,imx-sdhc";
 			reg = <0x402c0000 0x4000>;
 			status = "disabled";
 			interrupts = <110 0>;
 			clocks = <&ccm IMX_CCM_USDHC1_CLK 0 0>;
-			label = "USDHC_1";
+			label = "SDHC_0";
+			max-current-330 = <1020>;
+			max-current-180 = <1020>;
+			max-bus-freq = <208000000>;
+			min-bus-freq = <400000>;
 		};
 
 		usdhc2: usdhc@402c4000 {
-			compatible = "nxp,imx-usdhc";
+			compatible = "nxp,imx-sdhc";
 			reg = <0x402c4000 0x4000>;
 			status = "disabled";
 			interrupts = <111 0>;
 			clocks = <&ccm IMX_CCM_USDHC2_CLK 0 0>;
-			label = "USDHC_2";
+			label = "SDHC_1";
+			max-current-330 = <120>;
+			max-current-180 = <45>;
+			max-bus-freq = <198000000>;
+			min-bus-freq = <400000>;
 		};
 
 		csi: csi@402bc000 {

dts/bindings/sdhc/nxp,imx-sdhc.yaml

@@ -0,0 +1,79 @@
+# Copyright (c) 2022, NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: NXP imx USDHC controller
+
+compatible: "nxp,imx-sdhc"
+
+include: [sdhc.yaml, pinctrl-device.yaml]
+
+properties:
+  reg:
+    required: true
+
+  label:
+    required: true
+
+  data-timeout:
+    type: int
+    required: false
+    default: 0xF
+    description: |
+      Data timeout, as multiple of the SD clock. See DTOCV field of USDHC
+
+  read-watermark:
+    type: int
+    required: false
+    default: 0x80
+    description: |
+      Number of words used as read watermark level in FIFO queue for USDHC
+
+  write-watermark:
+    type: int
+    required: false
+    default: 0x80
+    description: |
+      Number of words used as write watermark level in FIFO queue for USDHC
+
+  max_current_330:
+    type: int
+    required: false
+    default: 0
+    description: |
+      Max drive current in mA at 3.3V. A value of zero indicates no maximum
+      is specified by the driver.
+  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.

dts/bindings/sdhc/sdhc.yaml

@@ -0,0 +1,55 @@
+# Copyright (c) 2022, NXP
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for SD host controllers
+
+include: base.yaml
+
+properties:
+  max-current-330:
+    type: int
+    required: false
+    default: 0
+    description: |
+      Max drive current in mA at 3.3V. A value of zero indicates no maximum
+      is specified by the driver.
+
+  max-current-300:
+    type: int
+    required: false
+    default: 0
+    description: |
+      Max drive current in mA at 3.0V. A value of zero indicates no maximum
+      is specified by the driver.
+
+  max-current-180:
+    type: int
+    required: false
+    default: 0
+    description: |
+      Max drive current in mA at 1.8V. A value of zero indicates no maximum
+      is specified by the driver.
+
+  max-bus-freq:
+    type: int
+    required: false
+    default: 400000
+    description: |
+      Maximum bus frequency for SD card. This should be the highest frequency
+      the SDHC is capable of negotiating with cards on the bus.
+
+  min-bus-freq:
+    type: int
+    required: false
+    default: 400000
+    description: |
+      Minimum bus frequency for SD card. This should be the frequency that
+      cards first will select when attached to the SDHC bus
+
+  power-delay-ms:
+    type: int
+    required: false
+    default: 500
+    description: |
+      time in ms for SDHC to delay when toggling power to the SD card. This
+      delay gives the card time to power up or down fully