AM68A: enable internal PCIE clock

yuli kaplunovsky

Part Number: AM68A

To use for PCIE the internal clock

SDK 9.1 has this for the .dts for j721e

ti,syscon-pcie-refclk-out = <&scm_conf 0x9008 0x900c 0x18090 0x8074 0x1>;

when I add it to the AM68A (which is j721s2) - it crashes on writing to 0x18090 - the CTRL_MMR are different between the two processors and the TRM does not have enough information to figure out the correct addresses.

Need help!

Thanks

over 1 year ago

0 Takuma Fujiwara over 1 year ago

TI__Mastermind 49963 points

Hi Yuli,

The register info can be found in j721s2_public_combined_registers.xlsx in the CTRL_MMR section. You could reference that sheet and the FAQ to make the patch.

Otherwise, I will need a couple of days to see if I can experiment/create a patch.

Regards,

Takuma

0 yuli kaplunovsky over 1 year ago in reply to Takuma Fujiwara

Prodigy 140 points

I wish I were able to find this xlsx document .... where can I download it from? thanks

0 Takuma Fujiwara over 1 year ago in reply to yuli kaplunovsky

TI__Mastermind 49963 points

Hi Yuli,

It should be in the same zip file as the TRM: https://www.ti.com/lit/zip/spruj28

Regards,

Takuma

0 yuli kaplunovsky over 1 year ago in reply to Takuma Fujiwara

Prodigy 140 points

thanks, apparently, I had this excel sheet all along, and never was aware if that - I think TI should do a better job of informing that this is available....

Now I can figure it out.

After I fix it, what would be the best way to publish it for others to benefit it? Or just to send the kernel patch to you?

Thanks!

0 Takuma Fujiwara over 1 year ago in reply to yuli kaplunovsky

TI__Mastermind 49963 points

Hi Yuli,

Sharing the patch in this E2E thread will be great. I can share this internally as well as update the referenced FAQ. Let me know if you face any other issues.

Regards,

Takuma

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AM68A: enable internal PCIE clock