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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/video/displaymode.txt | 42 | ||||
| -rw-r--r-- | doc/device-tree-bindings/video/tegra20-dc.txt | 85 |
2 files changed, 127 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/video/displaymode.txt b/doc/device-tree-bindings/video/displaymode.txt new file mode 100644 index 0000000..45ca42d --- /dev/null +++ b/doc/device-tree-bindings/video/displaymode.txt @@ -0,0 +1,42 @@ +videomode bindings +================== + +(from http://lists.freedesktop.org/archives/dri-devel/2012-July/024875.html) + +Required properties: + - xres, yres: Display resolution + - left-margin, right-margin, hsync-len: Horizontal Display timing + parameters in pixels + - upper-margin, lower-margin, vsync-len: Vertical display timing + parameters in lines + - clock: display clock in Hz + +Optional properties: + - width-mm, height-mm: Display dimensions in mm + - hsync-active-high (bool): Hsync pulse is active high + - vsync-active-high (bool): Vsync pulse is active high + - interlaced (bool): This is an interlaced mode + - doublescan (bool): This is a doublescan mode + +There are different ways of describing a display mode. The devicetree +representation corresponds to the one used by the Linux Framebuffer +framework described here in Documentation/fb/framebuffer.txt. This +representation has been chosen because it's the only format which does +not allow for inconsistent parameters. Unlike the Framebuffer framework +the devicetree has the clock in Hz instead of ps. + +Example: + + display@0 { + /* 1920x1080p24 */ + clock = <52000000>; + xres = <1920>; + yres = <1080>; + left-margin = <25>; + right-margin = <25>; + hsync-len = <25>; + lower-margin = <2>; + upper-margin = <2>; + vsync-len = <2>; + hsync-active-high; + }; diff --git a/doc/device-tree-bindings/video/tegra20-dc.txt b/doc/device-tree-bindings/video/tegra20-dc.txt new file mode 100644 index 0000000..4731c3f --- /dev/null +++ b/doc/device-tree-bindings/video/tegra20-dc.txt @@ -0,0 +1,85 @@ +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>; +}; |