i.MX Processorsのトピック回复： Enabling TPM on A core imx8ulp

Enabling TPM on A core imx8ulp

wendy-liu — Tue, 25 Feb 2025 01:59:39 GMT

I chose PTF19 (J20 pin3) to generate PWM signal.

After flashing, I open a terminal and execute the following commands:

cd /sys/class/pwm/pwmchip0;
echo 0 > export;
cd pwm0;
echo 400000 > period;
echo 200000 > duty_cycle;
echo 1 > enable;

Then , I use oscilloscope to measure it waveform , and it keeps outputting a high-level signal.

Could you give me some advice?

My dts ,config, log are as below.

Best Regard!

wendy-liu — Tue, 25 Feb 2025 06:04:47 GMT

Also, tpm_rpchip_0 is the node(/sys/class/pwm/pwmchip0/), but where is tpm5?

And, which TPM does tpm_rpchip_0 control?

There are some questions I would like to ask you.Hope your reply!Thanks a lot!

Chavira — Wed, 26 Feb 2025 16:29:09 GMT

HI @wendy-liu!
Thank you for contacting NXP Support!

I will start with the research of this issue.

It looks like the TPM only can be managed by M core and you can control the TPM module using rpmsg only.

I will give you an update as soon as possible.

Best Regards!

Chavira

wendy-liu — Thu, 27 Feb 2025 01:03:52 GMT

Looking forward your reply!

Thank you very much!

Chavira — Tue, 04 Mar 2025 16:32:27 GMT

Try changing the driver from "fsl,imx7ulp-tpm" to "fsl,imx7ulp-pwm" in imx8ulp.dtsi.

tpm5: tpm@29340000 { compatible = "fsl,imx8ulp-tpm", "fsl,imx7ulp-pwm";

Additional you should disable the LPSPI5 since the LPSPI5 is using the pin PTF19.

Best Regards!]

Chavira

wendy-liu — Thu, 06 Mar 2025 01:13:56 GMT

Thanks! I have been solved!

Best Regards!