linux-kernel - Re: [PATCH 1/2] media: v4l UAPI: add V4L2_BUF_CAP_SUPPORTS_RO

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Message-ID: <20200618175218.GB10831@chromium.org>
Date:   Thu, 18 Jun 2020 17:52:18 +0000
From:   Tomasz Figa <tfiga@...omium.org>
To:     Yunfei Dong <yunfei.dong@...iatek.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] media: v4l UAPI: add
 V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS

Hi Yunfei,

On Wed, Jun 17, 2020 at 09:49:27AM +0800, Yunfei Dong wrote:
> This patch adds support for the V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS
> flag. This flag is used for RO Request.

I think this patch series lacks two major things:
 - a cover letter explaining the feature and what it is needed/useful
   for,
 - a user - is there an upstream driver which would implement this
   feature and benefit from it?

Best regards,
Tomasz