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Subject: Re: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal
 to system freq
To: Nicolin Chen <nicoleotsuka@gmail.com>
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From: =?UTF-8?Q?=c5=81ukasz_Majewski?= <lukma@denx.de>
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Date: Wed, 6 Sep 2017 23:18:54 +0200
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On 09/06/2017 09:47 PM, Nicolin Chen wrote:
> On Wed, Sep 06, 2017 at 08:35:50PM +0200, Łukasz Majewski wrote:
>   
>> 	clocks = <&clks IMX6QDL_CLK_SSI2_IPG>,
>> 		 <&clks IMX6QDL_CLK_SSI2>;
>> 	clock-names = "ipg", "baud";
> 
>>>>   			dailink_master: cpu {
>>>>   			    sound-dai = <&ssi2>;
>>>> 			    clock = <&SSSS>;
>>
>> 	If possible I do prefer a solution, which uses only DTS.
>> Side question - how to refer to baud clock from [1]?
> 
> Just add a property to this cpu node like:
> 	clock = <&clks IMX6QDL_CLK_SSI2>;

Ok.

> 
>>>> 			    system-clock-frequency = <XXXX>;
> 
> This would not be necessary unless you want to specify a clock rate
> so as to override the clock rate configuration in hw_params().

Ok.

> 
>>> This is the right solution based on current simple-card driver. For
>>> SSI (having two clocks), you have to specify the baud clock in the
>>> cpu node like that. I believe this is what the simple-card designer
>>> expected users to do since the cpu node is the first place that the
>>> driver tries to look at.
>>
>> I will give a shoot the option with adding the ipg clock.
> 
> No, not ipg clock. You should use the second clock -- baud clock.

Yes. Correct - the baud clock.

> 


-- 
Best regards,

Lukasz Majewski

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