linux-kernel - Re: [Patch v2 11/11] Documention: v4l: Documentation for HEVC CIDs

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Message-id: <6c537c6a-0b87-0624-6770-73404972fb7a@samsung.com>
Date:   Tue, 07 Mar 2017 13:08:19 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Smitha T Murthy <smitha.t@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kyungmin.park@...sung.com, kamil@...as.org, jtp.park@...sung.com,
        mchehab@...nel.org, pankaj.dubey@...sung.com, krzk@...nel.org,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com
Subject: Re: [Patch v2 11/11] Documention: v4l: Documentation for HEVC CIDs


On 03.03.2017 10:07, Smitha T Murthy wrote:
> Added V4l2 controls for HEVC encoder

It should be rather "Document controls for HEVC encoder" or sth similar.

In general most of comments are in previous patch.
Few additional comments:
- please be careful about control names - they are exported to userspace
and becomes ABI, so it will be difficult to change them later (this
comment is rather to previous patch),
- please provide good documentation as for most users this documentation
will be the only available source of information,
- in short: bugs in the driver can be easily fixed(usually), wrong
control names will be hard to fix, weak documentation will prevent using it.

And regarding this patch:
- please expand all acronyms (pb, tmv, BIT,...),
- please consider using menu instead of numbers for profile, level,
tier, types, generally everywhere where control value enumerates
'things' and is not a pure number (coefficient, counter,...),
- if control is per-frame please drop it, V4L2 does not support it at
the moment ( I suppose ),

Regards
Andrzej