How to set continues mclk ON in processor?

[parth_modi]

Hi,

I am using imx8mq and 4.9.51 Linux distribution. I have connected processor's SAI1 to analog devices'ADAU1361 codec.(I2S interface)

My codec is working with external oscillator(12.288Mhz)MCLK. But i need to change clock source form external to internal.(i.e from processor's mclk pin).

The MCLK is generated from processor when i play audio.

Actually i need continues MCLK.

My query is

1) How to set continues mclk on in processor side?

Let me know if you need further information.

Thanks & regards,
Parth

[parth_modi]

Hi Igor,

Thanks for the reference.

This take lots of time to learn and We have little urgency to do this.

So,Can you please point out the exact function to set a mclk frequency and where to call?

Thanks & regards,

Parth

[传策薛]

May be you can use GPIO1_IO14 or GPIO1_IO15 pin ,iomux it as CLK

[igorpadykov]

Hi Parth

I am afraid there are no ready patches for that.

If you have some project requiring this feature, suggest to proceed with

 Professional Services to develop solution:

NXP Professional Services|NXP 

As simple workaround one can consider CCM_CLKO1,2 for outputting

continuous clock.

Best regards
igor

[igorpadykov]

Hi Parth

unfortunately there is no such option in dts file for such case, seems

driver modifications are needed. One can try to analyze driver sources in

linux/sound/soc/fsl/fsl_sai.c

fsl_sai.c\fsl\soc\sound - linux-imx - i.MX Linux kernel 

use alsa tutorial:

Writing an ALSA Driver 

Best regards
igor
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