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TDA4VEN-Q1: How to modify eMMC clock in driver

Xingyu Zhu

Expert 4285 points

Part Number: TDA4VEN-Q1

Tool/software:

Hi expert,

In order to avoid the EMC sensitive frequency, our customer need to modify the eMMC clock from 200M to 117M. We have successfully modified it by Linux command devmem2 0x00682088 w 0x8010. But we would like to know how to modify it in the original eMMC driver? Thanks

Best Regards,

Xingyu Zhu

0 Gokul Praveen 3 months ago

TI__Genius 10570 points

Hi Xingyu,

Xingyu Zhu said:
0x00682088 w 0x8010

Can you give more clarity on what this register points to and what the bits indicate.Thanks in advance.

Regards

Gokul

0 Xingyu Zhu 3 months ago in reply to Gokul Praveen

TI__Expert 4285 points

Hi Gokul,

Please check the register detail. Could you please help check how can we modify it in the driver? Thanks

https://software-dl.ti.com/tisci/esd/10_01_06/5_soc_doc/j722s/clocks.html\

0 Gokul Praveen 3 months ago in reply to Xingyu Zhu

TI__Genius 10570 points

Hi Xingyu,

Can you try adding the below property in the k3-am62p-main.dtsi file.

Regards

Gokul