video: parse the video-mode environment variable
Add function video_get_video_mode(), which parses the "video-mode" environment
variable and returns each of its components. The format matches the video=
command-line option used for Linux:
video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
<driver> The video driver, ignored by U-Boot
<xres> The X resolution (in pixels) to use.
<yres> The Y resolution (in pixels) to use.
<depth> The color depth (in bits) to use.
<freq> The frequency (in Hz) to use.
<options> A comma-separated list of device-specific options
Signed-off-by: Timur Tabi <timur@freescale.com>
diff --git a/doc/README.video b/doc/README.video
index 34e199c..0c04bea 100644
--- a/doc/README.video
+++ b/doc/README.video
@@ -28,3 +28,22 @@
- MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it
- GENIETV with AD7177 on a PAL TV (YCbYCr) - arsenio@tin.it
+
+
+"video-mode" environment variable
+===============================
+
+The 'video-mode' environment variable can be used to enable and configure
+some video drivers. The format matches the video= command-line option used
+for Linux:
+
+ video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
+
+ <driver> The video driver name, ignored by U-Boot
+ <xres> The X resolution (in pixels) to use.
+ <yres> The Y resolution (in pixels) to use.
+ <depth> The color depth (in bits) to use.
+ <freq> The frequency (in Hz) to use.
+ <options> A comma-separated list of device-specific options
+
+Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi
