imx93 GPIO to use as output PWM signal.

[sbmd_1234]

Hi,

I want to use the GPIO of imx93 as PWM output signal and also I want to set the duty cycle of it how can we configure this please help.


thanks.

[spawn]

Easy, look at the multiple examples in arch/arm64/boot/dts/. Pwm is named tpm.

[Chavira]

Hi @sbmd_1234!

Thank you for contacting NXP Support!

I am able to use the PWM on iMX93 EVK board.

1. Add the CONFIG_PWM_IMX_TPM to the imx_v8_defconfig file.
2. Add the configuration to the device tree.

   &tpm4 {
           pinctrl-names = "default";
           pinctrl-0 = <&pinctrl_tpm4>;
           status = "okay";
   };
   
   pinctrl_tpm4: tpm4grp {
           fsl,pins = <
               MX93_PAD_GPIO_IO05__TPM4_CH0	0x19e //EXP_GPIO_IO05 J1001 29
           >;
       };​

3.  When you flash the new Image and device tree to the board:

   $ cd /sys/class/pwm/pwmchip1/
   $ echo 0 >> export
   $ echo echo 2000000 >> pwm0/period
   $ echo echo 1000000 >> pwm0/duty_cycle
   $ echo 1 >> pwm0/enable

4. You can validate the signal on the pin 27 of the J1001 of the iMX93 EVK board Best Regards!
   Chavira

[sbmd_1234]

Hi, @Chavira 

I've enabled the config in menuconfig and added the dts changes I am able to get the /sys/class/pwm/pwmchip4 but the gpio pin of imx93 evk is not generating any signal?

though, I've wrote the duty_cycle, period and enabled also but still not worked.

can you please tell what could be the reason.

Thanks.

[Chavira]

Hi @sbmd_1234!

In my case the TPM is the pwmchip1.

Please refer to the next guide that I published today.

Best Regards!

Chavira

[sbmd_1234]

Hi @Chavira 

I am having a doubt, I am working on i.MX91 custom evaluation board so that board contains the GPIO2_IO05 pin header. My question is can we test the PWM signal on this pin if we configure this  "MX93_PAD_GPIO_IO05__TPM4_CH0" but can we check this on this pin "MX93_PAD_GPIO_IO05__GPIO2_IO05"?


Thanks for your support.

[Chavira]

Hi @sbmd_1234!

I don´t have access to the iMX91 documentation from now.

For this case I recommend to ask to your local DFAE for support.

Best Regards!

Chavira