linux-kernel - Re: [PATCH v2 5/5] drivers: media: platform: Add NPCM Video Capture/Encode Engine driver

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Date:   Thu, 19 May 2022 13:39:01 +0800
From:   Kun-Fa Lin <milkfafa@...il.com>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, CS20 KWLiu <kwliu@...oton.com>,
        tmaimon77@...il.com, avifishman70@...il.com,
        openbmc@...ts.ozlabs.org, tali.perry1@...il.com,
        Marvin Lin <kflin@...oton.com>
Subject: Re: [PATCH v2 5/5] drivers: media: platform: Add NPCM Video
 Capture/Encode Engine driver

Hi Jonathan,

Thanks for your comment.

> Similar to what I said in reply to the bindings patch, I would prefer to
> have the VCD code and the ECE code in two separate files, if possible,
> to make reuse of the VCD code alone (on WPCM450) easier.

This video driver is bassed on V4L2 framework to implement the
required interfaces,
and the V4L2 application in user-space (e.g., openbmc/obmc-ikvm) will
interact with
these interfaces to get compressed video data for supporting KVM
features. In this
architecture, for the case of WPCM450 (though it's in EOL for several
years), I'd prefer
to try to let ECE be an optional node instead of separating ECE code
from this V4L2
video driver. However, this patch series could be the base version and
keep reviewing,
and afterwards we could make another patch for optional ECE, is it OK for you?

Regards,
Marvin