linux-kernel - Re: [PATCH 1/2] ARM: Dove: Add the audio devices in DT

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Date:	Wed, 28 Aug 2013 13:15:48 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Jean-Francois Moine <moinejf@...e.fr>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: [PATCH 1/2] ARM: Dove: Add the audio devices in DT

Dear Sebastian Hesselbarth,

On Wed, 28 Aug 2013 12:26:31 +0200, Sebastian Hesselbarth wrote:

> >> as Mark Brown already took the bindings patch for above generic
> >> compatible, how are we going to discriminate different
> >> implementations/features of Dove, Kirkwood, and Armada 370?
> >
> > I agree that mvebu-audio is not a really good compatible string. It
> > should use the first SoC that introduced the IP block, so that if
> > future SOCs have variations, we can introduce separate compatible
> > strings.
> >
> > So for now, the compatible string should be kirkwood-audio.
> 
> Unfortunately, mvebu-audio has already been taken by Mark. Also, we
> know the differences for the three SoCs now and should have a compatible
> for each (and maybe mvebu-audio for fallback).

For 3.12, right? So 3.12 hasn't been released yet, so it's still time
to fix this.

> Also, we'll need to distinguish between the different audio controllers
> on a single SoC, i.e. i2s0 and i2s1. I suggest checking the (phys) reg
> base passed.

For what reason does the driver needs to know whether it's the instance
0 or instance 1 ? If it's needed for some specific reason, then there
should probably be something like marvell,i2s-channel-id = <0> and
marvell,i2s-channel-id = <1>.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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