linux-kernel - Re: [PATCH v7 16/34] [media] add Omnivision OV5640 sensor driver

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Message-ID: <20170603195139.GA3062@amd>
Date:   Sat, 3 Jun 2017 21:51:39 +0200
From:   Pavel Machek <pavel@....cz>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, linux@...linux.org.uk, mchehab@...nel.org,
        hverkuil@...all.nl, nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        shuah@...nel.org, sakari.ailus@...ux.intel.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v7 16/34] [media] add Omnivision OV5640 sensor driver

Hi!

> >>>+	/* Auto/manual exposure */
> >>>+	ctrls->auto_exp = v4l2_ctrl_new_std_menu(hdl, ops,
> >>>+						 V4L2_CID_EXPOSURE_AUTO,
> >>>+						 V4L2_EXPOSURE_MANUAL, 0,
> >>>+						 V4L2_EXPOSURE_AUTO);
> >>>+	ctrls->exposure = v4l2_ctrl_new_std(hdl, ops,
> >>>+					    V4L2_CID_EXPOSURE_ABSOLUTE,
> >>>+					    0, 65535, 1, 0);
> >>
> >>Is exposure_absolute supposed to be in microseconds...?
> >
> >Yes.
> 
> According to the docs V4L2_CID_EXPOSURE_ABSOLUTE is in 100 usec units.
> 
>  OTOH V4L2_CID_EXPOSURE has no defined unit, so it's a better fit IMO.
> >Way more drivers appear to be using EXPOSURE than EXPOSURE_ABSOLUTE, too.
> 
> Done, switched to V4L2_CID_EXPOSURE. It's true, this control is not
> taking 100 usec units, so unit-less is better.

Thanks. If you know the units, it would be of course better to use
right units...

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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