Linux beaglebone 4.14.108-ti-r108

[ghost]

Hi
On BBB
###Cape Universal Enable
enable_uboot_cape_universal=1

Hello,

• I can see in this kernel the pwm's being enabled, and the naming is pwm-0:0.Is the first digit the chip then second the export # always. ?

• Is there a way to find out from the sys file system the pwm-0:0 GPIO kernel # or the rail PX_Y pin association. Thank you.

  lrwxrwxrwx 1 root pwm 0 Oct 11 19:42 device -> ../../../48300100.ecap
  --w--w---- 1 root pwm 4096 Oct 11 19:42 export
  -r--r--r-- 1 root pwm 4096 Oct 11 19:41 npwm
  drwxrwxr-x 2 root pwm 0 Oct 11 19:41 power
  drwxrwxr-x 3 root pwm 0 Oct 11 19:41 pwm-0:0

Also some pins mapping from config-pin does not apply. On th eold kernel I was able to
use GPIO 71 P8-46 on pwmchip6/pwm1 but now exporting 1 > gpiochip6 says no device.
I wrote this https://redypis.org/addons/bb_pins.php utility to parse the config_pin array and I see
that p8_46 is on 0x3:ehrpwm2B which is EHRPWM2 (ePWM2) which is pwmchip6 channel B
so export 1 should work !
What I am missing. Thank you

beaglebone:/sys/class/pwm/pwmchip6$ echo 1 > export 
-bash: echo: write error: No such device

And then all these fail

user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 10000 > ./duty_cycle -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 1 > enable -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 0 > enable -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ config-pin P8.46 pwm user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 1 > enable -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 0 > enable -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$ echo 0 > ./enable -bash: echo: write error: Invalid argument user@beaglebone:/sys/class/pwm/pwmchip6/pwm-6:0$

[RobertCNelson]

Repeat of: #139 closing