mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 16:53:06 +00:00
86 lines
2.4 KiB
Text
86 lines
2.4 KiB
Text
|
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>;
|
||
|
|
};
|