linux-kernel - Re: [PATCH] Core driver for WM97xx touchscreens

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Message-ID: <20080119215506.GA7400@sirena.org.uk>
Date:	Sat, 19 Jan 2008 21:55:07 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Dmitry <dbaryshkov@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	liam.girdwood@...fsonmicro.com
Subject: Re: [PATCH] Core driver for WM97xx touchscreens

On Sat, Jan 19, 2008 at 10:48:32PM +0300, Dmitry wrote:

> Well... It's a common suggestion not to duplicate code. The wm97xx bus
> looks mostly like platform. The only difference is the name. To help
> visualisation, devices can have parents. Just set (in pseudocode)
> wm97xx-touchscreen->parent to wm97xx, do the same for wm97xx-battery
> and so on. Thus all devices would be on the platform device but with
> proper parent <-> child notation.

That's exactly what I had understood you to mean.  I guess it's just
that using the platform bus for this purpose feels like an abstraction
violation to me due to having platform devices parented off a device on
another bus.  Obviously it's just my model of a platform device that's
wrong here.  I will change the driver to use the platform bus for my
next submission.

> git://git.mnementh.co.uk/linux-2.6-im.git#tmio_dev_try3. Look for

Thanks, I'll take a look.

> 2008/1/19, Mark Brown <broonie@...nsource.wolfsonmicro.com>:

> > current patch series these chips all also provide an audio codec which
> > requires a reasonably substantial driver for full support.

> This would only touch child devices organisation.

Indeed - I mention it mostly for additional motivation.
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