Re: Tegra DRM device tree bindings

[Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

On Wed, 27 Jun 2012 16:44:14 +0200
Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> wrote:

> > I think that "coherent_pool" can be used only when the amount of
> > contiguous memory is short in your system. Otherwise even unnecessary.
> > 
> > Could you explain a bit more why you want carveout size on per-board basis?
> 
> In the ideal case I would want to not have a carveout size at all.
> However there may be situations where you need to make sure some driver
> can allocate a given amount of memory. Having to specify this using a
> kernel command-line parameter is cumbersome because it may require
> changes to the bootloader or whatever. So if you know that a particular
> board always needs 128 MiB of carveout, then it makes sense to specify
> it on a per-board basis.

Hm...I could understand somewhat;) but DT can also specify "bootargs"
in dts file, which can support per-board-wide spec too, like the above
sum of carveout needed from all drivers. I just want to avoid
introducing a new parameter additionaly if we can make use of the
existing mechanism.