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

[Stephen Warren]

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

> 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.