This is in drivers/video/videomodes.c: video_get_params() format, e.g.
x:800,y:480,depth:18,pclk_khz:33000,le:16,ri:209,up:22,lo:22,hs:30,vs:1,sync:0,vmode:0
+config VIDEO_LCD_DCLK_PHASE
+ int "LCD panel display clock phase"
+ depends on VIDEO
+ default 1
+ ---help---
+ Select LCD panel display clock phase shift, range 0-3.
+
config VIDEO_LCD_POWER
string "LCD panel power enable pin"
depends on VIDEO