On 08/31/2015 01:31 PM, Hans Verkuil wrote:
> On 08/30/2015 05:06 AM, Mauro Carvalho Chehab wrote:
>> As we'll be removing entity subtypes from the Kernel, we need
>> to provide a way for drivers and core to check if a given
>> entity is represented by a V4L2 subdev or if it is an V4L2
>> I/O entity (typically with DMA).
>
> This needs more discussion. The plan (as I understand it) is to have
> properties
> that describe the entity's functionalities.
>
> The existing entity subtypes will exist only as backwards compat types, but in
> the future properties should be used to describe the functionalities.
>
> This raises the question if we shouldn't use MEDIA_ENT_T_V4L2_SUBDEV to tell
> userspace that this is a subdev-controlled entity, and let userspace look at
> the properties to figure out what it is exactly?
>
> It could be that this is a transitional patch, and this will be fixed later.
> If so, this should be mentioned in the commit message.
FYI, I'm skipping patches that change the MEDIA_ENT_T_V4L2_SUBDEV usage until
I understand the long-term plan for this define as discussed above.
Regards,
Hans
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