linux-kernel - Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT documentation

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Message-ID: <20140320151934.GV7528@n2100.arm.linux.org.uk>
Date:	Thu, 20 Mar 2014 15:19:34 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT
	documentation

On Thu, Mar 20, 2014 at 03:59:35PM +0100, Jean-Francois Moine wrote:
> On Thu, 20 Mar 2014 14:31:10 +0000
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> 
> > 1. change the DT compatible strings the driver has to accept both
> >    nxp,tda19988 and nxp,tda19989, and set the appropriate device
> >    in the DT file (tda19988).  I'm a bit nervous about using
> >    "nxp,tda1998x" in case we're clashing with devices with different
> >    characteristics.
> 
> The Cubox is sold with either the TDA19988 or the TDA19989 (I don't
> know about the AMX33XX boards). Then, setting the exact type in the DT
> would ask for 2 differents DTs or for having two tda998x definitions in
> a same DT...

I'm not saying that it has to match the physical device fitted - I'm
merely suggesting not using nxp,tda1998x which could (and as Sebastian
has found, does) conflict with other devices with different properties.

We still auto-detect the exact device type by reading the ID register
because that's the most reliable way to detect exactly what kind of
device is fitted to the board.

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