Linux/66AK2G12: eHRPWM Driver question

Jeffrey Limbocker

Part Number: 66AK2G12

Tool/software: Linux

Hello,

I am using Linux SDK 04.02.00.09 and am attempting to use the eHRPWM peripheral on the 66AK2G12 processor to control a PWM fan in Linux. According to the wiki (http://processors.wiki.ti.com/index.php/Linux_Core_PWM_User%27s_Guide) I should be able to find a configuration option for this peripheral under Device Drivers -> Pulse Width Modulation (PWM) in menuconfig. I am only able to find the eCAP driver under this section.

Is the eHRPWM driver not supported for 66AK2G12? Is there a list of drivers not supported by this platform on Linux?

Thank you,

Jeff

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi Jeff,

It seems that the high resolution PWM module driver does not support K2G devices, see drivers/pwm/pwm-tiehrpwm.c & drivers/pwm/pwm-tipwmss.c :

static const struct of_device_id ehrpwm_of_match[] = {
{ .compatible = "ti,am3352-ehrpwm" },
{ .compatible = "ti,am33xx-ehrpwm" },
{},

static const struct of_device_id pwmss_of_match[] = {
{ .compatible = "ti,am33xx-pwmss" },
{},
};
As you can see it supports only the Sitara (AM3x, AM4x & AM5x) devices.

If you wish to use the ehrpwm module you will have to modify the dts nodes (see how this is done for AM57x devices, refer to arch/arm/boot/dts/dra7.dtsi ===> epwmss1/2 dts nodes and their respective ehrpwm1/2 child nodes) and possibly the pwm-tipwmss.c & pwm-tiehrpwm.c drivers' code to match the K2G architecture.

Best Regards,
Yordan

0 Jeffrey Limbocker over 8 years ago in reply to Yordan Kovachev

Expert 2380 points

Excellent. Thank you for the information. If I decide to pursue driver modifications, I will be sure to share them with the community.

Processors

Processors forum

Linux/66AK2G12: eHRPWM Driver question