Re: [PATCH] media: venus: assign unique bus_info strings for encoder and decoder

Konrad Dybcio
2025-11-27T11:47:23Z

On 11/25/25 1:55 PM, Jorge Ramirez wrote:
> On 21/11/25 20:22:13, Konrad Dybcio wrote:
>> On 11/21/25 7:43 PM, Jorge Ramirez-Ortiz wrote:
>>> The Venus encoder and decoder video devices currently report the same
>>> bus_info string ("platform:qcom-venus").
>>>
>>> Assign unique bus_info identifiers by appending ":dec" and ":enc" to the
>>> parent device name. With this change v4l2-ctl will display two separate
>>> logical devices
>>>
>>> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
>>> ---
>>
>> Perhaps that's a stupid question, but is there a reason they're
>> separate at all?
>
> not sure I understand, enc/dec support different APIs, v4l2 controls..is
> that what you mean?

Perhaps that shows my lack of knowledge about V4L2. I had imagined that
a single video device could implement (non-colliding) enc_xyz and dec_xyz
operations and was wondering why we need two.

Konrad