linux-kernel - Re: [PATCH v2] ASoC: simple-card: add support for aux devices

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Message-ID: <20160924180045.g7ayhbpbaxle34pt@sirena.org.uk>
Date:   Sat, 24 Sep 2016 19:00:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Otto Kekäläinen <otto@...avo.fi>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Mengdong Lin <mengdong.lin@...ux.intel.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Andrew Lunn <andrew@...n.ch>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] ASoC: simple-card: add support for aux devices

On Fri, Sep 23, 2016 at 05:25:41PM -0500, Rob Herring wrote:
> On Fri, Sep 23, 2016 at 10:11:12AM +0300, Nikita Yushchenko wrote:

> > +- simple-audio-card,aux-devs		: List of phandles pointing to auxiliary devices, such
> > +					  as amplifiers, to be added to the sound card.

> I think the property should be specific as to the type of device. What 
> if you have 2 amps? Maybe simple-card can't have 2 outputs. What if you 
> have a chain of devices and need to know the order of them?

Sorry, missed this bit...  We already have the audio routing properties
which define how things are interconnected, this exists to get pure
analogue components into the set of things that can be routed to.  The
abstraction we're using hides what the device is well enough.

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