Date: Sat, 11 Mar 2017 22:30:54 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>, Sakari Ailus <sakari.ailus@iki.fi>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Steve Longerbeam <slongerbeam@gmail.com>, robh+dt@kernel.org,
        mark.rutland@arm.com, shawnguo@kernel.org, kernel@pengutronix.de,
        fabio.estevam@nxp.com, mchehab@kernel.org, nick@shmanahar.org,
        markus.heiser@darmarIT.de, p.zabel@pengutronix.de,
        laurent.pinchart+renesas@ideasonboard.com, bparrot@ti.com,
        geert@linux-m68k.org, arnd@arndb.de, sudipm.mukherjee@gmail.com,
        minghsiu.tsai@mediatek.com, tiffany.lin@mediatek.com,
        jean-christophe.trotin@st.com, horms+renesas@verge.net.au,
        niklas.soderlund+renesas@ragnatech.se, robert.jarzmik@free.fr,
        songjun.wu@microchip.com, andrew-ct.chen@mediatek.com,
        gregkh@linuxfoundation.org, shuah@kernel.org,
        sakari.ailus@linux.intel.com, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@mentor.com>
Subject: Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit
 controls from a pipeline
Message-ID: <20170311213054.GA7319@amd>
References: <1487211578-11360-1-git-send-email-steve_longerbeam@mentor.com>
 <1487211578-11360-15-git-send-email-steve_longerbeam@mentor.com>
 <20170302160257.GK3220@valkosipuli.retiisi.org.uk>
 <20170303230645.GR21222@n2100.armlinux.org.uk>
 <20170304131329.GV3220@valkosipuli.retiisi.org.uk>
 <a7b8e095-a95c-24bd-b1e9-e983f18061c4@xs4all.nl>
 <20170310120902.1daebc7b@vento.lan>
 <5e1183f4-774f-413a-628a-96e0df321faf@xs4all.nl>
 <20170311101408.272a9187@vento.lan>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
        protocol="application/pgp-signature"; boundary="7JfCtLOvnd9MIVvH"
Content-Disposition: inline
In-Reply-To: <20170311101408.272a9187@vento.lan>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1463
Lines: 48


--7JfCtLOvnd9MIVvH
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Hi!

> > > Ok, perhaps supporting both subdev API and V4L2 API at the same
> > > time doesn't make much sense. We could disable one in favor of the
> > > other, either at compilation time or at runtime. =20
> >=20
> > Right. If the subdev API is disabled, then you have to inherit the subd=
ev
> > controls in the bridge driver (how else would you be able to access the=
m?).
> > And that's the usual case.
> >=20
> > If you do have the subdev API enabled, AND you use the MC, then the
> > intention clearly is to give userspace full control and inheriting cont=
rols
> > no longer makes any sense (and is highly confusing IMHO).
>=20
> I tend to agree with that.

Well, having different userspace interface according to config options
is strange. I believe the right solution is to make complex drivers
depend on CONFIG_VIDEO_V4L2_SUBDEV_API...

									Pavel
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

--7JfCtLOvnd9MIVvH
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iEYEARECAAYFAljEbI4ACgkQMOfwapXb+vKY7wCgmkZ4Kq3LhwIAxMXv8u8TyBSI
/WQAnipq8Jn9ApopF2wXueH2/qjvHsEj
=egDP
-----END PGP SIGNATURE-----

--7JfCtLOvnd9MIVvH--