linux-kernel - Re: [PATCH] media: venus: assign unique bus

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Message-ID: <6eb8681d-d82e-457f-907d-3ba5b94267f2@oss.qualcomm.com>
Date: Thu, 27 Nov 2025 12:47:19 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Jorge Ramirez <jorge.ramirez@....qualcomm.com>
Cc: vikash.garodia@....qualcomm.com, dikshita.agarwal@....qualcomm.com,
        bod@...nel.org, mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: venus: assign unique bus_info strings for encoder
 and decoder

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@....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