| Simon Glass | eefe3e5 | 2012-10-17 13:24:48 +0000 | [diff] [blame] | 1 | videomode bindings |
| 2 | ================== |
| 3 | |
| 4 | (from http://lists.freedesktop.org/archives/dri-devel/2012-July/024875.html) |
| 5 | |
| 6 | Required properties: |
| 7 | - xres, yres: Display resolution |
| 8 | - left-margin, right-margin, hsync-len: Horizontal Display timing |
| 9 | parameters in pixels |
| 10 | - upper-margin, lower-margin, vsync-len: Vertical display timing |
| 11 | parameters in lines |
| 12 | - clock: display clock in Hz |
| 13 | |
| 14 | Optional properties: |
| 15 | - width-mm, height-mm: Display dimensions in mm |
| 16 | - hsync-active-high (bool): Hsync pulse is active high |
| 17 | - vsync-active-high (bool): Vsync pulse is active high |
| 18 | - interlaced (bool): This is an interlaced mode |
| 19 | - doublescan (bool): This is a doublescan mode |
| 20 | |
| 21 | There are different ways of describing a display mode. The devicetree |
| 22 | representation corresponds to the one used by the Linux Framebuffer |
| 23 | framework described here in Documentation/fb/framebuffer.txt. This |
| 24 | representation has been chosen because it's the only format which does |
| 25 | not allow for inconsistent parameters. Unlike the Framebuffer framework |
| 26 | the devicetree has the clock in Hz instead of ps. |
| 27 | |
| 28 | Example: |
| 29 | |
| 30 | display@0 { |
| 31 | /* 1920x1080p24 */ |
| 32 | clock = <52000000>; |
| 33 | xres = <1920>; |
| 34 | yres = <1080>; |
| 35 | left-margin = <25>; |
| 36 | right-margin = <25>; |
| 37 | hsync-len = <25>; |
| 38 | lower-margin = <2>; |
| 39 | upper-margin = <2>; |
| 40 | vsync-len = <2>; |
| 41 | hsync-active-high; |
| 42 | }; |