4 (from http://lists.freedesktop.org/archives/dri-devel/2012-July/024875.html)
7 - xres, yres: Display resolution
8 - left-margin, right-margin, hsync-len: Horizontal Display timing
10 - upper-margin, lower-margin, vsync-len: Vertical display timing
12 - clock: display clock in Hz
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
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.