linux-kernel - Re: [PATCH 1/6] ASoC: max98088: Document DT bindings

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Message-ID: <54E5EF73.2090302@suse.de>
Date:	Thu, 19 Feb 2015 15:13:07 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	alsa-devel@...a-project.org, linux-samsung-soc@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>
CC:	Sangbeom Kim <sbkim73@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Vincent Palatin <vpalatin@...omium.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH 1/6] ASoC: max98088: Document DT bindings

Hello Javier, Doug,

Am 19.02.2015 um 14:55 schrieb Javier Martinez Canillas:
> On 02/18/2015 07:25 PM, Andreas Färber wrote:
>> Signed-off-by: Andreas Färber <afaerber@...e.de>
>> ---
>>  Documentation/devicetree/bindings/sound/max98088.txt | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/sound/max98088.txt
>>
>> diff --git a/Documentation/devicetree/bindings/sound/max98088.txt b/Documentation/devicetree/bindings/sound/max98088.txt
>> new file mode 100644
>> index 000000000000..6f8fe85040ee
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/sound/max98088.txt
>> @@ -0,0 +1,16 @@
>> +MAX98088 audio CODEC
>> +
>> +This device supports I2C only.
>> +
>> +Required properties:
>> +
>> +- compatible : "maxim,max98088" or "maxim,max98089".
>> +
>> +- reg : The I2C address of the device.
>> +
>> +Example:
>> +
>> +max98089: codec@10 {
>> +	compatible = "maxim,max98089";
>> +	reg = <0x10>;
>> +};
>>
> 
> I see that a master clock (mclk) is added in patch 6/6 but the
> max98088 codec driver does handle this clock.
> 
> If the SoC XCLKOUT provides the master clock to the max98089
> codec in Spring like is the case for the max9809{0,5} codecs
> in the Snow and Peach Pit/Pi Chromebooks then you need to do
> something along the lines of the following commits:
> 
> e3048c3d2be5 ASoC: max98095: Add master clock handling
> b10ab7b838bd ASoC: max98090: Add master clock handling
> 
> If that's the case you also have to mention in the DT binding
> doc that "clocks" and "clock-names" are optional properties
> like Documentation/devicetree/bindings/sound/max9809{0,5}.txt.

When I prepared this patch, I believe it was a straight copy from
max98090. Sounds like they changed since then.

My 6/6 adopted the mclk clock from your now-cancelled v2 patch for Snow,
assuming it would be the same on all Chromebooks. I tested that last
change by checking for errors in dmesg.

Doug, can you advise on how the clock wiring is for Spring?

Regards,
Andreas

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