Thread (28 messages) flat view 28 messages, 5 authors, 2017-09-08

Re: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq

From: Nicolin Chen <nicoleotsuka@gmail.com>
Date: 2017-09-06 19:47:27
Also in: alsa-devel, lkml

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";
quoted
quoted
 			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>;
quoted
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		    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().
quoted
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.
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