Re: [PATCH v7 5/7] media: i2c: add DS90UB960 driver

Laurent Pinchart
2023-01-26T10:51:54Z

On Thu, Jan 26, 2023 at 12:21:06PM +0200, Andy Shevchenko wrote:
> On Thu, Jan 26, 2023 at 10:41:47AM +0200, Tomi Valkeinen wrote:
> > On 25/01/2023 17:27, Andy Shevchenko wrote:
>
> ...
>
> > > But I probably don't understand the ATR structure and what exactly we need to
> > > pass to it, perhaps it also can be replaced with properties (note, that we have
> > > some interesting ones that called references, which is an alternative to DT
> > > phandle).
> >
> > Well, maybe this needs a Linux bus implementation. I'm not that familiar
> > with implementing a bus, but I think that would make it easier to share data
> > between the deserializer and the serializer. A bus sounds a bit like an
> > overkill for a 1-to-1 connection, used by a few drivers, but maybe it
> > wouldn't be too much code.
>
> Have you looked at auxiliary bus (appeared a few releases ago in kernel)?

As far as I understand, the auxiliary bus infrastructure is meant for
use cases where a single hardware device needs to be split into multiple
logical devices (as in struct device). Platform devices were
historically (ab)used for this, and the auxiliary bus is meant as a
cleaner solution. I'm not sure if it would be a good match here, or if
it would be considered an abuse of the auxiliary bus API.

--
Regards,

Laurent Pinchart