Hi Robert, Anatolji,
On 26/07/2013 09:50, Anatolij Gustschin wrote:
I realize that there's already the FDT and CONFIG_OF_CONTROL functionality and device trees sort of cover the passing to Linux part so maybe before handing it off, converting the relevant data into a device tree that Linux can already use/parse would work.
Devicetree bindings for describing display timings info exist in recent Linux kernel versions (since v3.9 I think) and are documented under Documentation/devicetree/bindings/video/display-timing.txt. In Linux there are also DT helpers to parse display timings nodes and read the timing values into fb_videomode structure (of_get_display_timings, of_get_fb_videomode). Code for adding such display timings nodes to the device tree under U-Boot doesn't exist yet.
IMHO adopting DT looks very interesting, as it can really simplify sharing configuration between u-boot and kernel. On i.MX6 we have not yet started to use DT to configure u-boot as it is already done on other SOCs (Tegra), but it seems to me the right way to do.
Best regards, Stefano Babic