lcdc.dtsi

#include "subarctic/pinctrl.h"
#include "bone/pins.h"

// LCD controller

// Functional clock frequency in Hz (max 252 MHz)
#define LCDC_FCK 250000000

&lcdc {
	status = "okay";
	compatible = "uio";
	symlink = "uio/lcdc";

	pinctrl-names = "default";
	pinctrl-0 = <&lcdc_pins>;

	// configure LCDC functional clock
	assigned-clocks		= <&lcd_gclk>;
	// there are three mux options:
#if (LCDC_FCK == 250000000)
	// use 250 MHz from core PLL
	assigned-clock-parents	= <&dpll_core_m5_ck>;
	assigned-clock-rates	= <0>;
#elif (LCDC_FCK == 192000000)
	// use 192 MHz from peripheral PLL
	assigned-clock-parents	= <&dpll_per_m2_ck>;
	assigned-clock-rates	= <0>;
#else
	// use custom frequency from display PLL
	assigned-clock-parents	= <&dpll_disp_m2_ck>;
	assigned-clock-rates	= <LCDC_FCK>;
#endif
};

&am33xx_pinmux {
	lcdc_pins: lcdc {
		pinctrl-single,pins = <
			// See 'LCDC' sheet of https://goo.gl/Jkcg0w for details

			// These are always driven, hence no pull needed.
			PIN_OUT_NOPULL(   P8_27, 0 )  // vsync / nALE / RS
			PIN_OUT_NOPULL(   P8_29, 0 )  // hsync / RnW / nWS
			PIN_OUT_NOPULL(   P8_28, 0 )  // pclk / EN / nRS
			PIN_OUT_NOPULL(   P8_30, 0 )  // oe/acb / nCS0 / E0
		//	PIN_OUT_NOPULL(   P8_18, 1 )  // mclk / nCS1 / E1

			// d0-d15 have external pull (sysboot)
			// Disable internal pulls to avoid risking conflict.
			PIN_IO_NOPULL(    P8_45, 0 )  // d0
			PIN_IO_NOPULL(    P8_46, 0 )  // d1
			PIN_IO_NOPULL(    P8_43, 0 )  // d2
			PIN_IO_NOPULL(    P8_44, 0 )  // d3
			PIN_IO_NOPULL(    P8_41, 0 )  // d4
			PIN_IO_NOPULL(    P8_42, 0 )  // d5
			PIN_IO_NOPULL(    P8_39, 0 )  // d6
			PIN_IO_NOPULL(    P8_40, 0 )  // d7
			PIN_IO_NOPULL(    P8_37, 0 )  // d8
			PIN_IO_NOPULL(    P8_38, 0 )  // d9
			PIN_IO_NOPULL(    P8_36, 0 )  // d10
			PIN_IO_NOPULL(    P8_34, 0 )  // d11
			PIN_IO_NOPULL(    P8_35, 0 )  // d12
			PIN_IO_NOPULL(    P8_33, 0 )  // d13
			PIN_IO_NOPULL(    P8_31, 0 )  // d14
			PIN_IO_NOPULL(    P8_32, 0 )  // d15

			// Haven't checked whether d16-d23 are always driven, so
			// keep the pulldown enabled to be safe.
		//	PIN_OUT_PULLDOWN( P8_15, 1 )  // d16
		//	PIN_OUT_PULLDOWN( P8_16, 1 )  // d17
		//	PIN_OUT_PULLDOWN( P8_11, 1 )  // d18
		//	PIN_OUT_PULLDOWN( P8_12, 1 )  // d19
		//	PIN_OUT_PULLDOWN( P8_17, 1 )  // d20
		//	PIN_OUT_PULLDOWN( P8_14, 1 )  // d21
		//	PIN_OUT_PULLDOWN( P8_13, 1 )  // d22
		//	PIN_OUT_PULLDOWN( P8_19, 1 )  // d23
		>;
	};
};