| 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>; |
| }; |
