1Display Controller
2------------------
3
4(there isn't yet a generic binding in Linux, so this describes what is in
5U-Boot, and may change based on Linux activity)
6
7The device node for a display device is as described in the document
8"Open Firmware Recommended Practice : Universal Serial Bus" with the
9following modifications and additions :
10
11Required properties :
12 - compatible : Should be "nvidia,tegra20-dc"
13
14Required subnode 'rgb' is as follows:
15
16Required properties (rgb) :
17 - nvidia,panel : phandle of LCD panel information
18
19
20The panel node describes the panel itself. This has the properties listed in
21displaymode.txt as well as:
22
23Required properties (panel) :
24 - nvidia,bits-per-pixel: number of bits per pixel (depth)
25 - nvidia,pwm : pwm to use to set display contrast (see tegra20-pwm.txt)
26 - nvidia,panel-timings: 4 cells containing required timings in ms:
27	* delay before asserting panel_vdd
28	* delay between panel_vdd-rise and data-rise
29	* delay between data-rise and backlight_vdd-rise
30	* delay between backlight_vdd and pwm-rise
31	* delay between pwm-rise and backlight_en-rise
32
33Optional GPIO properies all have (phandle, GPIO number, flags):
34 - nvidia,backlight-enable-gpios: backlight enable GPIO
35 - nvidia,lvds-shutdown-gpios: LVDS power shutdown GPIO
36 - nvidia,backlight-vdd-gpios: backlight power GPIO
37 - nvidia,panel-vdd-gpios: panel power GPIO
38
39Example:
40
41host1x {
42	compatible = "nvidia,tegra20-host1x", "simple-bus";
43	reg = <0x50000000 0x00024000>;
44	interrupts = <0 65 0x04   /* mpcore syncpt */
45			0 67 0x04>; /* mpcore general */
46
47	#address-cells = <1>;
48	#size-cells = <1>;
49	status = "okay";
50
51	ranges = <0x54000000 0x54000000 0x04000000>;
52
53	dc@54200000 {
54		compatible = "nvidia,tegra20-dc";
55		reg = <0x54200000 0x00040000>;
56		interrupts = <0 73 0x04>;
57		status = "okay";
58
59		rgb {
60			status = "okay";
61			nvidia,panel = <&lcd_panel>;
62		};
63	};
64};
65
66lcd_panel: panel {
67	/* Seaboard has 1366x768 */
68	clock = <70600000>;
69	xres = <1366>;
70	yres = <768>;
71	left-margin = <58>;
72	right-margin = <58>;
73	hsync-len = <58>;
74	lower-margin = <4>;
75	upper-margin = <4>;
76	vsync-len = <4>;
77	hsync-active-high;
78	nvidia,bits-per-pixel = <16>;
79	nvidia,pwm = <&pwm 2 0>;
80	nvidia,backlight-enable-gpios = <&gpio 28 0>;	/* PD4 */
81	nvidia,lvds-shutdown-gpios = <&gpio 10 0>;	/* PB2 */
82	nvidia,backlight-vdd-gpios = <&gpio 176 0>;	/* PW0 */
83	nvidia,panel-vdd-gpios = <&gpio 22 0>;		/* PC6 */
84	nvidia,panel-timings = <400 4 203 17 15>;
85};
86