linux-kernel - Re: [PATCH v3 0/9] Media Controller capture driver for DM365

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Message-Id: <201211290843.36468.hverkuil@xs4all.nl>
Date:	Thu, 29 Nov 2012 08:43:36 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:	devel@...verdev.osuosl.org,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Prabhakar Lad <prabhakar.lad@...com>,
	Hans Verkuil <hansverk@...co.com>,
	Prabhakar Lad <prabhakar.csengg@...il.com>,
	Sakari Ailus <sakari.ailus@....fi>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	LMML <linux-media@...r.kernel.org>
Subject: Re: [PATCH v3 0/9] Media Controller capture driver for DM365

On Wed November 28 2012 20:30:21 Greg Kroah-Hartman wrote:
> On Wed, Nov 28, 2012 at 08:18:20PM +0100, Hans Verkuil wrote:
> > On Wed November 28 2012 18:22:48 Greg Kroah-Hartman wrote:
> > > On Wed, Nov 28, 2012 at 10:18:02AM -0200, Mauro Carvalho Chehab wrote:
> > > > Em Wed, 28 Nov 2012 12:56:10 +0100
> > > > Hans Verkuil <hansverk@...co.com> escreveu:
> > > > 
> > > > > On Wed 28 November 2012 12:45:37 Dan Carpenter wrote:
> > > > > > I wish people wouldn't submit big patches right before the merge
> > > > > > window opens...  :/ It's better to let it sit in linux-next for a
> > > > > > couple weeks so people can mess with it a bit.
> > > > > 
> > > > > It's been under review for quite some time now, and the main change since
> > > > > the last posted version is that this is now moved to staging/media.
> > > > > 
> > > > > So it is not yet ready for prime time, but we do want it in to simplify
> > > > > the last remaining improvements needed to move it to drivers/media.
> > > > 
> > > > "last remaining improvements"? I didn't review the patchset, but
> > > > the TODO list seems to have several pending stuff there:
> > > > 
> > > > +- User space interface refinement
> > > > +        - Controls should be used when possible rather than private ioctl
> > > > +        - No enums should be used
> > > > +        - Use of MC and V4L2 subdev APIs when applicable
> > > > +        - Single interface header might suffice
> > > > +        - Current interface forces to configure everything at once
> > > > +- Get rid of the dm365_ipipe_hw.[ch] layer
> > > > +- Active external sub-devices defined by link configuration; no strcmp
> > > > +  needed
> > > > +- More generic platform data (i2c adapters)
> > > > +- The driver should have no knowledge of possible external subdevs; see
> > > > +  struct vpfe_subdev_id
> > > > +- Some of the hardware control should be refactorede
> > > > +- Check proper serialisation (through mutexes and spinlocks)
> > > > +- Names that are visible in kernel global namespace should have a common
> > > > +  prefix (or a few)
> > > > 
> > > > From the above comments, both Kernelspace and Userspace APIs require 
> > > > lots of work.
> > 
> > And that's why it is in staging. Should a long TODO list now suddenly
> > prevent staging from being used? In Barcelona we discussed this and the
> > only requirement we came up was was that it should compile.
> 
> Yes, that's all I care about in staging, but as I stated, I don't
> maintain drivers/staging/media/ that area is under Mauro's control
> (MAINTAINERS even says this), and I'm a bit leery of going against the
> wishes of an existing subsystem maintainer for adding staging drivers
> that tie into their subsystem.
> 
> So if you get Mauro's approval, I'll be glad to queue it up.

Just for the record, my comments were addressed to Mauro, not to you.
I should have stated that in my mail explicitly. As you said, it's
Mauro's decision.

Regards,

	Hans
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