Enabling TPM on A core imx8ulp-evk9

[dhruvinrajpura]

Hi @Chavira 

I am using imx8ulp-9x9-evk and in A core I want to enable TPM for that I gone through below thread
https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/How-to-use-PWM-on-iMX93-EVK-board/ta-p/1... 

In my board I am using PTF19(J20->pin3) pin for generate pwm signal

 
I put patch in attachemnt where I add tpm5 and pinctrl_tpm5 after that I given below command but I am not able to see any signal on pin.

$ cd /sys/class/pwm/pwmchip0/
$ echo 0 >> export
$ echo echo 1000000 >> pwm0/period  # Set period to 2,000,000 ns (2 ms)
$ echo echo 1000000 >> pwm0/duty_cycle  # Set duty cycle to 1,000,000 ns (1 ms)
$ echo 1 >> pwm0/enable

[wendy-liu]

hi, has your problem been resolved? I'm facing the same situation with you.....

Could you give me some reference?Thanks a lot!

[dhruvinrajpura]

Hi @Chavira 

I am enabling CONFIG_PWM_IMX_TPM it in imx_v8_defconfig by applying patch for same &
for state of TH10_ARDUINO_SWITCH need to check but I connected anlyzer on J20.3(ARDU_D10) which is PTF19 where I am getting only high signal.

[dhruvinrajpura]

Thanks @Chavira for quick response

I applied below patched as per your suggesstions but I am not getting anything on PTF19 with logic anlyzer, You can recheck commands and patches I am applying for same, Here is attchements as well

Commands

$ cd /sys/class/pwm/pwmchip0/
$ echo 0 >> export
$ echo 1000000 >> pwm0/period  # Set period to 2,000,000 ns (2 ms)
$ echo 1000000 >> pwm0/duty_cycle  # Set duty cycle to 1,000,000 ns (1 ms)
$ echo 1 >> pwm0/enable

[Chavira]

Hi @dhruvinrajpura!

I tried and I noticed that LPSPI5 is using the PTF19 too.

By my side I disabled the LPSPI5 and I put in HIGH the signal TH10_ARDUINO_SWITCH with the command:

$ gpioset -c gpiochip2 10=1 &

Please check with dmesg command to see if you have a problem loading the proper driver because the pwm0 is not the tpm5 the pwm0 that you are watching is the tpm_rpchip_0.

For research purpose I use the PTF19 as a GPIO in Arduino Header without problem after that information you only have to add the tpm node in device tree.

Best Regards!

Chavira

[dhruvinrajpura]

@Chavira 

sharing rpmsg dtsi for reference, we are trying to use tpm5_ch0 by enabling pwm0 which is assigned to rpmsg here,
Is there any other pin where we can check this tpm on evk9?

[dhruvinrajpura]

@Chavira 

here is my dmesg logs for reference

root@imx8ulp-9x9-lpddr4-evk:~# dmesg | grep pwm
[    1.601357] virtio_rpmsg_bus virtio0: creating channel rpmsg-pwm-channel addr 0x5
[    1.607322] pwm-rpmsg virtio0.rpmsg-pwm-channel.-1.5: new channel: 0x403 -> 0x5!
[    2.137851] imx_rpmsg_pwm pwm: add PWM chip 0 successfully
root@imx8ulp-9x9-lpddr4-evk:~# dmesg | grep tpm
[    0.008544] clocksource: imx-tpm: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
root@imx8ulp-9x9-lpddr4-evk:~# 

[dhruvinrajpura]

@Chavira 

In my case PTF19 (j20.3) is always staying high and I can see that below used at many places

pinctrl-assert-gpios = <&pca6416_1 10 GPIO_ACTIVE_HIGH>;

[dhruvinrajpura]

Hi @Chavira 

I didn't get what you did in last, like have you used PTF19 as pwm and can you see waves on anlyzer?

[Chavira]

HI @dhruvinrajpura!
Thank you for contacting NXP Support!

Your TPM configuration looks good, however the PTF19 is muxed externally.

To use that pin in the Arduino header you should add the next property to the TPM node:

pinctrl-assert-gpios = <&pca6416_1 10 GPIO_ACTIVE_HIGH>;

and additionally I recommend to disable the LPUART6.

in imx8ulp-evk.dts you should do the next change:

&lpuart6 {
	/* BT */
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&pinctrl_lpuart6>;
	pinctrl-1 = <&pinctrl_lpuart6>;
-       status = "okay";
+	status = "disabled";

	bluetooth {
		compatible = "nxp,88w8987-bt";
	};
};

and delete the lpuart6 node in imx8ulp-9x9-evk.dts

&lpspi5 { /* conflict with lpuart6 PAD_PTF16-19 */
	status = "disabled";
};

- &lpuart6 {
- 	pinctrl-assert-gpios = <&pca6416_1 10 GPIO_ACTIVE_LOW>;
- };

after that additional changes you can see the output in the Arduino Header.

The PWM signal is on pin 22 of the M.2 connector with your current configuration.

Best Regards!

Chavira

[Chavira]

Hi @dhruvinrajpura!

Are you enabling the config CONFIG_PWM_IMX_TPM in kernel?

Also can you ensure that the signal TH10_ARDUINO_SWITCH is on HIGH state?

I can´t test it on the board from now.

If the problem persist let me know.

I attached my dts recommendations.

Best Regards!

Alejandro