dt-bindings: mmc: sdhci-am654: Document bindings for the host controllers on TI's AM654 SOCs

Device Tree Bindings for the SDHCI Controllers present on TI's AM654 SOCs

The bindings follow the mmc[1], clock[2] and interrupt[3] bindings.

Only deviations are documented here.

  [1] Documentation/devicetree/bindings/mmc/mmc.txt

  [2] Documentation/devicetree/bindings/clock/clock-bindings.txt

  [3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

Required Properties:

	- compatible: should be "ti,am654-sdhci-5.1"

	- reg: Must be two entries.

		- The first should be the sdhci register space

		- The second should the subsystem/phy register space

	- clocks: Handles to the clock inputs.

	- clock-names: Tuple including "clk_xin" and "clk_ahb"

	- interrupts: Interrupt specifiers

	- ti,otap-del-sel: Output Tap Delay select

	- ti,trm-icp: DLL trim select

	- ti,driver-strength-ohm: driver strength in ohms.

				  Valid values are 33, 40, 50, 66 and 100 ohms.

Example:

	sdhci0: sdhci@4f80000 {

		compatible = "ti,am654-sdhci-5.1";

		reg = <0x0 0x4f80000 0x0 0x260>, <0x0 0x4f90000 0x0 0x134>;

		power-domains = <&k3_pds 47>;

		clocks = <&k3_clks 47 0>, <&k3_clks 47 1>;

		clock-names = "clk_ahb", "clk_xin";

		interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;

		sdhci-caps-mask = <0x80000007 0x0>;

		mmc-ddr-1_8v;

		ti,otap-del-sel = <0x2>;

		ti,trm-icp = <0x8>;

	};