| Simon Glass | 3a331e6 | 2012-10-17 13:24:48 +0000 | [diff] [blame] | 1 | Display Controller |
| 2 | ------------------ |
| 3 | |
| 4 | (there isn't yet a generic binding in Linux, so this describes what is in |
| 5 | U-Boot, and may change based on Linux activity) |
| 6 | |
| 7 | The device node for a display device is as described in the document |
| 8 | "Open Firmware Recommended Practice : Universal Serial Bus" with the |
| 9 | following modifications and additions : |
| 10 | |
| 11 | Required properties : |
| 12 | - compatible : Should be "nvidia,tegra20-dc" |
| 13 | |
| 14 | Required subnode 'rgb' is as follows: |
| 15 | |
| 16 | Required properties (rgb) : |
| 17 | - nvidia,panel : phandle of LCD panel information |
| 18 | |
| 19 | |
| 20 | The panel node describes the panel itself. This has the properties listed in |
| 21 | displaymode.txt as well as: |
| 22 | |
| 23 | Required 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 | |
| 33 | Optional 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 | |
| 39 | Example: |
| 40 | |
| 41 | host1x { |
| 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 | |
| 66 | lcd_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 | }; |