Re: [greybus-dev] Re: [PATCH] staging: greybus: remove camera driver marked as broken since 2016

[Ayush Singh <ayushsingh1325@gmail.com>]

Greg Kroah-Hartman <gregkh@linuxfoundation.org> writes:

> On Fri, Sep 18, 2026 at 03:43:20PM +0300, Dan Carpenter wrote:
>> On Fri, Sep 18, 2026 at 07:18:54AM -0500, Alex Elder wrote:
>> > On 9/17/26 8:14 PM, Ethan Nelson-Moore wrote:
>> > > The Greybus camera driver has been marked as BROKEN since
>> > > commit d4f56b47a8fa ("staging: greybus: Add drivers/staging/greybus to
>> > > the build"). It has not been able to compile since at least
>> > > commit ec0ad868173d ("staging: greybus: move core include files to
>> > > include/linux/greybus/") because it includes greybus_protocols.h from
>> > > its own directory. These two facts make it very clear there is no
>> > > demand for this driver. Remove it from the kernel.
>> > 
>> > Hmmm.  Do you know why it is BROKEN?  Do you know what it
>> > would take to make it work?  I understand the point of
>> > removing it, but in part the Greybus code has historically
>> > served as sample code for people to work on.  It might be
>> > nicer to have fixing it be a pet project.
>> > 
>> 
>> The compile breaks because of:
>> 
>> commit aa1b4da6af67d5c6a4e933c2d30890c6f282f505
>> Author: Boris Brezillon <bbrezillon@kernel.org>
>> Date:   Mon Nov 10 14:28:35 2014 -0300
>> 
>>     [media] v4l: Forbid usage of V4L2_MBUS_FMT definitions inside the kernel
>>     
>>     Place v4l2_mbus_pixelcode in a #ifndef __KERNEL__ section so that kernel
>>     users don't have access to these definitions.
>
> Good point, no one has picked this up since then so let's drop the
> driver and if it ever is needed in the future it can be reverted and
> brought back.

Just wanted to chime in, that there has been some work on audio and camera
protocols on the Zephyr side as part of Google Summer of Code 2026
[0]. With that said, the work never truly interacted with the kernel
driver. I would like to at some point, but I don't really have the
bandwidth at the moment. So it seems reasonable as well.

>
> thanks,
>
> greg k-h
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[0]: https://forum.beagleboard.org/t/gsoc-2026-final-report-greybus-camera-audio-protocol-implementation-in-zephyr/44315

Best Regards,
Ayush Singh