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- Display Controller
- ------------------
- (there isn't yet a generic binding in Linux, so this describes what is in
- U-Boot, and may change based on Linux activity)
- The device node for a display device is as described in the document
- "Open Firmware Recommended Practice : Universal Serial Bus" with the
- following modifications and additions :
- Required properties :
- - compatible : Should be "nvidia,tegra20-dc"
- Required subnode 'rgb' is as follows:
- Required properties (rgb) :
- - nvidia,panel : phandle of LCD panel information
- The panel node describes the panel itself. This has the properties listed in
- displaymode.txt as well as:
- Required properties (panel) :
- - nvidia,bits-per-pixel: number of bits per pixel (depth)
- - nvidia,pwm : pwm to use to set display contrast (see tegra20-pwm.txt)
- - nvidia,panel-timings: 4 cells containing required timings in ms:
- * delay before asserting panel_vdd
- * delay between panel_vdd-rise and data-rise
- * delay between data-rise and backlight_vdd-rise
- * delay between backlight_vdd and pwm-rise
- * delay between pwm-rise and backlight_en-rise
- Optional GPIO properies all have (phandle, GPIO number, flags):
- - nvidia,backlight-enable-gpios: backlight enable GPIO
- - nvidia,lvds-shutdown-gpios: LVDS power shutdown GPIO
- - nvidia,backlight-vdd-gpios: backlight power GPIO
- - nvidia,panel-vdd-gpios: panel power GPIO
- Example:
- host1x {
- compatible = "nvidia,tegra20-host1x", "simple-bus";
- reg = <0x50000000 0x00024000>;
- interrupts = <0 65 0x04 /* mpcore syncpt */
- 0 67 0x04>; /* mpcore general */
- #address-cells = <1>;
- #size-cells = <1>;
- status = "okay";
- ranges = <0x54000000 0x54000000 0x04000000>;
- dc@54200000 {
- compatible = "nvidia,tegra20-dc";
- reg = <0x54200000 0x00040000>;
- interrupts = <0 73 0x04>;
- status = "okay";
- rgb {
- status = "okay";
- nvidia,panel = <&lcd_panel>;
- };
- };
- };
- lcd_panel: panel {
- /* Seaboard has 1366x768 */
- clock = <70600000>;
- xres = <1366>;
- yres = <768>;
- left-margin = <58>;
- right-margin = <58>;
- hsync-len = <58>;
- lower-margin = <4>;
- upper-margin = <4>;
- vsync-len = <4>;
- hsync-active-high;
- nvidia,bits-per-pixel = <16>;
- nvidia,pwm = <&pwm 2 0>;
- nvidia,backlight-enable-gpios = <&gpio 28 0>; /* PD4 */
- nvidia,lvds-shutdown-gpios = <&gpio 10 0>; /* PB2 */
- nvidia,backlight-vdd-gpios = <&gpio 176 0>; /* PW0 */
- nvidia,panel-vdd-gpios = <&gpio 22 0>; /* PC6 */
- nvidia,panel-timings = <400 4 203 17 15>;
- };
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