linux-kernel - Re: [PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

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Date:   Wed, 29 Aug 2018 16:26:56 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, alexandre.belloni@...tlin.com,
        nicolas.ferre@...rochip.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, florian.meier@...lo.de,
        cristian.birsan@...rochip.com
Subject: Re: [PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a
 WM8731)

On Wed, Aug 29, 2018 at 06:20:59PM +0300, Codrin Ciubotariu wrote:
> On 29.08.2018 17:53, Mark Brown wrote:

> > That also has the nice bonus that with that I think you'd be able to use
> > the graph card rather than a custom driver?

> The main reason for adding a custom driver and not using graph/simple card
> is the snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
> XTAL_RATE, SND_SOC_CLOCK_IN) call. This enables the oscillator found in the
> wm8731 codec. Since WM8731_SYSCLK_XTAL is not 0, we can't use
> system-clock-frequency DT property to set it.

Right, that'd be more substantial surgery on the driver to change the DT
binding so that it's got a clock provider in it; it'd be nice to do but
it's a bit much to make it a blocker so the machine driver is OK.

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