[U-Boot] [PATCH v2 07/19] tegra: fdt: Add LCD definitions for Tegra

Simon Glass
2012-07-11T04:44:10Z

Hi Stephen,

On Fri, Jun 15, 2012 at 1:32 AM, Stephen Warren <swarren@wwwdotorg.org>wrote:

> On 06/13/2012 10:19 AM, Simon Glass wrote:
> > Add LCD definitions and also a proposed binding for LCD displays.
> >
> > The PWFM is in progress on the device-tree-discuss list, so only a
> > very basic binding is offered here.
>
> I believe we have settled on a final representation, it just hasn't been
> added into linux-next yet. See:
>
>
> http://gitorious.org/linux-pwm/linux-pwm/commit/d3ce73e5dc86646a6302f2b0f7dd40e8c552fa04

Thanks for the pointer. I suppose this doesn't address clocks as yet, but
that's fine.

>
>
> > I am not sure if it is better to have the lcd within the display
> > controller as with i2c/spi, or a separate node. From a hardware point
> > of view the LCD is certainly connected to the display controller, so
> > perhaps this version makes most sense. We could have a stand-alone
> > top-level lcd node with a phandle pointing to the display controller,
> > but these doesn't seem to be an obvious advantage to that approach.
>
> Equally, there's been extensive discussion re: how to represent the
> NVIDIA display controller in DT. I strongly believe that U-Boot
> shouldn't go ahead in isolation with a binding that's completely
> unrelated to what's happening in the kernel. Please can you take what
> Thierry is working on for the kernel, and/or contribute to that binding
> etc., so we don't end up with multiple ways of doing the same thing.
> Part of the whole point of DT is to have a single way of representing HW
> that multiple OSs (or perhaps bootloaders) cna use. If everyone just
> goes and does their own thing, we've lost.
>

I can see the email here.

http://lists.freedesktop.org/archives/dri-devel/2012-April/021223.html

I posted this series originally in January. That email is from April, and I
don't see activity in the last 2 months. As previously discussed it is not
productive to chase a moving target.

Thierry, have you settled on a binding yet? If not do you have something
sort-of close that I could use in U-Boot?

Regards.
Simon