linux-kernel - Re: [PATCH 7/8] ASoC: atmel: document clock properties of the wm8904 driver

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Date:	Fri, 21 Mar 2014 10:48:56 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<nicolas.ferre@...el.com>,
	Boris BREZILLON <b.brezillon@...rkiz.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>, Rob Landley <rob@...dley.net>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] ASoC: atmel: document clock properties of the wm8904
 driver

Hi Mark Brown,

On 03/20/2014 09:47 PM, Mark Brown wrote:
> On Thu, Mar 20, 2014 at 10:37:53AM +0800, Bo Shen wrote:
>
>> For this, in my mind, I think we need add following parameters in DT.
>> 1. sysclk_src_from_fll --> we need do nothing.
>
> No, how would this work?  If nothing else the FLL needs configuration.

Only configure it in machine driver. Then no DT operation.

>> 2. sysclk_src_from_mclk
>>     2.1 use_external_xtal --> we need clock_frequency
>>     2.2 !use_external_xtal --> we need retrieve clock and clock_frequency.
>
> No, this is all handled in the clock binding.  If there's a fixed rate
> clock the device tree should have a fixed rate clock provided.
>
>> Does this acceptable? Or any other better suggestion for this?
>
> Just have the device tree describe the hardware and provide a way of
> specifying an optional MCLK.
>

I will implement an RFC patch, please help review it. Thanks.

Best Regards,
Bo Shen
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