[PATCH v2 12/26] drm/exynos: Split manager/display/subdrv

[Sean Paul]

On Wed, Oct 23, 2013 at 10:29 AM, Dave Airlie <airlied at gmail.com> wrote:
>> As I mentioned earlier, display_ops is needed to have no any
>> dependency of drm framework directly like below,
>>
>>                                           DRM Framework
>>                                                        |
>>                                         Exynos DRM Framework
>>                                                     /   |   \
>>                                          Real device drivers
>>
>> In particular, in case of ARM based DRM drivers with separated
>> devices, I still tend to think it's better design than that device
>> drivers implement the connector callbacks directly, but I will try to
>> consider what is the better way.
>>
>
> I think we need to start considering a framework where subdrivers just
> add drm objects themselves, then the toplevel node is responsible for
> knowing that everything for the current configuration is loaded.
>

It would be nice to specify the various pieces in dt, then have some
type of drm notifier to the toplevel node when everything has been
probed. Doing it in the dt would allow standalone drm_bridge/drm_panel
drivers to be transparent as far as the device's drm driver is
concerned.

Sean


> I realise we may need to make changes to the core drm to allow this
> but we should probably start to create a strategy for fixing the API
> issues that this throws up.
>
> Note I'm not yet advocating for dynamic addition of nodes once the
> device is in use, or removing them.
>
> Dave.