ARM: dts: Add FIMD DT binding Documentation

Device-Tree bindings for Samsung SoC display controller (FIMD)

FIMD (Fully Interactive Mobile Display) is the Display Controller for the

Samsung series of SoCs which transfers the image data from a video memory

buffer to an external LCD interface.

Required properties:

- compatible: value should be one of the following

		"samsung,s3c2443-fimd"; /* for S3C24XX SoCs */

		"samsung,s3c6400-fimd"; /* for S3C64XX SoCs */

		"samsung,s5p6440-fimd"; /* for S5P64X0 SoCs */

		"samsung,s5pc100-fimd"; /* for S5PC100 SoC  */

		"samsung,s5pv210-fimd"; /* for S5PV210 SoC */

		"samsung,exynos4210-fimd"; /* for Exynos4 SoCs */

		"samsung,exynos5250-fimd"; /* for Exynos5 SoCs */

- reg: physical base address and length of the FIMD registers set.

- interrupt-parent: should be the phandle of the fimd controller's

		parent interrupt controller.

- interrupts: should contain a list of all FIMD IP block interrupts in the

		 order: FIFO Level, VSYNC, LCD_SYSTEM. The interrupt specifier

		 format depends on the interrupt controller used.

- interrupt-names: should contain the interrupt names: "fifo", "vsync",

	"lcd_sys", in the same order as they were listed in the interrupts

        property.

- pinctrl-0: pin control group to be used for this controller.

- pinctrl-names: must contain a "default" entry.

- clocks: must include clock specifiers corresponding to entries in the

         clock-names property.

- clock-names: list of clock names sorted in the same order as the clocks

               property. Must contain "sclk_fimd" and "fimd".

Optional Properties:

- samsung,power-domain: a phandle to FIMD power domain node.

Example:

SoC specific DT entry:

	fimd@11c00000 {

		compatible = "samsung,exynos4210-fimd";

		interrupt-parent = <&combiner>;

		reg = <0x11c00000 0x20000>;

		interrupt-names = "fifo", "vsync", "lcd_sys";

		interrupts = <11 0>, <11 1>, <11 2>;

		clocks = <&clock 140>, <&clock 283>;

		clock-names = "sclk_fimd", "fimd";

		samsung,power-domain = <&pd_lcd0>;

		status = "disabled";

	};

Board specific DT entry:

	fimd@11c00000 {

		pinctrl-0 = <&lcd_clk &lcd_data24 &pwm1_out>;

		pinctrl-names = "default";

		status = "okay";

	};