AM625: u-boot: epwm support

Gireesh Hiremath

Intellectual 385 points

Part Number: AM625

Hi,

We are trying to get epwm for DPI backlight in u-boot for custom am625 board.

I found below node in k3-am62-main.dtsi

epwm0: pwm@23000000 {
compatible = "ti,am64-epwm", "ti,am3352-ehrpwm";

but "ti,am3352-ehrpwm" not for am625 and not found driver "ti,am64-epwm"

please give suggestion to enable PWM in u-boot for am62x.

Regards,

Gireesh Hiremath

over 1 year ago

0 Nick Saulnier over 1 year ago

TI__Guru** 101750 points

Hello Gireesh,

I am sending your thread over to one of our uboot experts. Feel free to ping the thread if you don't get a response within a few business days.

Regards,

Nick

0 Hong Guan64 over 1 year ago in reply to Nick Saulnier

TI__Guru 69070 points

Hello Gireesh,
I'm not aware of PWM support in AM62x u-boot.
Best,
-Hong

0 Gireesh Hiremath over 1 year ago in reply to Hong Guan64

Intellectual 385 points

Hi,

Please forward this ticket to who aware of ePWM in am62x u-boot

Thanks,

Gireesh Hiremath

0 Hong Guan64 over 1 year ago in reply to Gireesh Hiremath

TI__Guru 69070 points

Let me loop in my colleague for input...
Best,
-Hong

0 Gireesh Hiremath over 1 year ago in reply to Hong Guan64

Intellectual 385 points

Hi,

Any update on this?

Regards,

Gireesh Hiremath

0 Gireesh Hiremath over 1 year ago

Intellectual 385 points

Hi,

Any suggestion?

Thanks,

Gireesh Hiremath

0 Gireesh Hiremath over 1 year ago

Intellectual 385 points

Hi,

Any update on this?

Regards,

Gireesh Hiremath

0 Gireesh Hiremath over 1 year ago

Intellectual 385 points

Hi,

Any hope on this?

Regards,

Gireesh Hiremath

0 Praneeth Bajjuri over 1 year ago in reply to Gireesh Hiremath

TI__Expert 6346 points

gireesh hiremath,

We have enabled Early Splash (This includes backlight with LVDS panel) . Can you review :https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/Foundational_Components/U-Boot/UG-Splash-Screen.html?highlight=splash

Are you looking for similar thing ?

0 Praneeth Bajjuri over 1 year ago in reply to Praneeth Bajjuri

TI__Expert 6346 points

Will also investigate what is missing in the driver to extend the support of pwm on am62 as well. Meanwhile, hope the above information helps you to review on how early splash is enabled today to showcase the feature.

0 Gireesh Hiremath over 1 year ago in reply to Praneeth Bajjuri

Intellectual 385 points

Yes, I followed above document, it provide details about panel but not found any info about backlight. Present LVDS uses the external pwm to control backlight.

0 Gireesh Hiremath over 1 year ago in reply to Praneeth Bajjuri

Intellectual 385 points

Hi, is there anyway to control pwm till we get driver?

Processors

Processors forum

AM625: u-boot: epwm support