linux-kernel - Re: [PATCH v4 1/1] ASoc: kirkwood: add DT support to the mvebu audio subsystem

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Date:	Fri, 09 Aug 2013 11:34:30 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Jean-Francois Moine <moinejf@...e.fr>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/1] ASoc: kirkwood: add DT support to the mvebu audio
 subsystem

On 08/09/13 11:19, Mark Brown wrote:
> On Fri, Aug 09, 2013 at 10:23:50AM +0200, Sebastian Hesselbarth wrote:
>> On 08/08/2013 01:22 PM, Jean-Francois Moine wrote:
>
>>> +i2s1: audio-controller@...00 {
>>> +	compatible = "mrvl,mvebu-audio";
>>> +	reg = <0xb4000 0x2210>;
>>> +	interrupts = <21>, <22>;
>>> +	clocks = <&gate_clk 13>;
>>> +	clock-names = "internal";
>>> +};
>
>> Also we will need some phandle reference to the audio codec here. As
>> this property is ongoing work in ASoC core, I suggest we wait for it
>> and propose a binding afterwards.
>
> No, as discussed this should be in the binding for the audio subsystem
> not in the binding for an individual component in that subsystem.
>

Mark,

I do understand there may be SoCs requiring sophisticated extra audio
nodes, but Marvell SoCs don't. I prefer having a single node for the
i2s controller *and* exploit the audio subsystem properties from that.

For Marvell audio, we only need a single node for all three ASoC
drivers. No other subsystem _requires_ you to have extra nodes for
it's needs. If you can provide interrupts, just have an interrupt-
controller property. If you can provide clocks, you can link to that
very node - no virtual device node required. Even for media they
do not insist on a virtual node but they do have generic properties
you can exploit.

If you insist on creating a virtual sound card node just because
ASoC wants it that way - okay, your call. But I don't see any value
in that.

Sebastian
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