2012/9/26 Mark Brown <broo...@opensource.wolfsonmicro.com>:
> On Wed, Sep 26, 2012 at 12:03:44AM +0900, Inki Dae wrote:
>> 2012/9/25 Laurent Pinchart <laurent.pinch...@ideasonboard.com>:
>
>> > Aren't DT bindings considered as an ABI, and required to be supported more 
>> > or
>> > less forever ? If you merge this DT binding you'll have to keep supporting 
>> > it.
>> > That's why DT bindings should not be rushed in.
>
>> is ABI required for DT binding?  I know DT binding parses just lcd
>> timing data from device tree file so ABI isn't needed. but when it
>> comes to DT, I'm novice yet so there may be my missing point. could
>> you tell me why DT bindings are considered as an ABI? if there is my
>> missing point, will consider it again.
>
> It's supposed to be possible to ship a DT with a board and then boot any
> OS or OS version on the board.  If the meaning of the DT keeps changing
> then this becomes impossible, you need to keep changing the DT when you
> change the thing that parses it (rendering the whole exercise pointless).
>

thank you for your comments. got it. DT is built as an binary(dtb) and
the dtb file should be re-used without any modifications. will keep
this patch until the videomode helper will be merged to mainline so
that this could be modified based on videomode helper later.

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