Re: [PATCH 08/21] OMAPDSS: clean up the omapdss platform data mess

Archit Taneja
2012-03-08T08:54:28Z

On Thursday 08 March 2012 02:03 PM, Tomi Valkeinen wrote:
> On Thu, 2012-03-08 at 13:47 +0530, Archit Taneja wrote:
>> On Thursday 08 March 2012 01:32 PM, Tomi Valkeinen wrote:
>
>>>> why do we check board_data being NULL here and not in omap_display_init()?
>>>
>>> I added it for DT case, because then we don't have board_data for the
>>> devices defined in the DT data. However, for now we always have the
>>> board_data, and in this patch I should just move the code. So I'll
>>> remove the check, and add it later with DT code if needed.
>>
>> Ok. When DT will be in use, would omap_display_init() be called or not?
>
> No. Currently the board files create and fill the board_data, and then
> call omap_display_init.
>
> With DT, the DT data will contain all the dynamic, per-board
> information. Something like:
>
> dss {
> dpi {
> dvi {
> pd-gpio =<10>;
> ...
> };
> };
>
> dsi@1 {
> taal {
> reset-gpio =<20>;
> ...
> };
> }
>
> ...
> };
>
> The DT data will be passed individually to each dss driver (i.e. dsi
> driver will get its DT node, etc.). The drivers will read the data, and
> initialize themselves with that, more or less the same manner they'd do
> with the board_data from board files.
>
> However, we currently have this "omapdss" device, which is not a hwmod
> device at all. In the long run I think the omapdss device should be
> removed, but for now we need it. And device has to be created in the
> arch code, the same way it's now created in omap_display_init().
>
> So with DT we need a new func, omap_display_init_dt() or such, which
> creates the omapdss device, and also creates a board_data which contains
> the ctx_loss etc function pointers. But the board data won't have any
> display data, those come directly from DT data.
>
> It's a bit messy solution, but it should allow us to have both DT and
> non-DT working at the same time, with quite minimal changes to the board
> files.

Okay, thanks for the clarification.

Archit

>
> Tomi
>