You know this makes me cringe when I think about it. But perhaps Bonescript needs it's own dt overlay ? One needs consistency when using a certain thing, and based on what I'm seeing, you're not guaranteed that. What's more, there is no real way you can expect this either, considering difference capes do different things.
*Or* there needs to be a mechanism in device tree, that populates some file somewhere, that lets the users know what's going on. This *can* be done via /dev/mem/ and using mmap() to read out register data for every pin, and perihperal to see what state it's in but man . . . that'd be an awful lot of work to do, just to port bonescript . . . On Mon, Feb 8, 2016 at 5:36 PM, Mark A. Yoder <[email protected]> wrote: > Yup, here's the mappings depending on which dts file is used: > > # universaln > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:32 pwmchip0 -> > ../../devices/platform/ocp/48300000.epwmss/48300200.ehrpwm/pwm/pwmchip0 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:32 pwmchip2 -> > ../../devices/platform/ocp/48302000.epwmss/48302200.ehrpwm/pwm/pwmchip2 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:32 pwmchip4 -> > ../../devices/platform/ocp/48300000.epwmss/48300100.ecap/pwm/pwmchip4 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:32 pwmchip5 -> > ../../devices/platform/ocp/48304000.epwmss/48304100.ecap/pwm/pwmchip5 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:32 pwmchip6 -> > ../../devices/platform/ocp/48304000.epwmss/48304200.ehrpwm/pwm/pwmchip6 > > > # cape-emmc > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:01 pwmchip0 -> > ../../devices/platform/ocp/48300000.epwmss/48300100.ecap/pwm/pwmchip0 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:01 pwmchip1 -> > ../../devices/platform/ocp/48304000.epwmss/48304100.ecap/pwm/pwmchip1 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:01 pwmchip2 -> > ../../devices/platform/ocp/48300000.epwmss/48300200.ehrpwm/pwm/pwmchip2 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:01 pwmchip4 -> > ../../devices/platform/ocp/48302000.epwmss/48302200.ehrpwm/pwm/pwmchip4 > # 0 lrwxrwxrwx 1 root root 0 Feb 8 19:01 pwmchip6 -> > ../../devices/platform/ocp/48304000.epwmss/48304200.ehrpwm/pwm/pwmchip6 > > Yes, the addresses are there, so I need to find a place that maps the > addresses to the header pin numbers. > > --Mark > > On Monday, February 8, 2016 at 6:42:11 PM UTC-5, RobertCNelson wrote: >> >> On Mon, Feb 8, 2016 at 5:36 PM, Mark A. Yoder <[email protected]> >> wrote: >> > Well.... /sys/class/pwm/pwmchip2/pwm0 worked! Thanks... >> > >> > So given the pin name (P9_14 for example) how do I find the pwm path? >> (I'm >> > trying to port bonescript to Jessie.) >> >> For the pwm, I think it's load order (scary).... not sure if we can >> for an alias in the dt.. >> >> Regards, >> >> -- >> Robert Nelson >> https://rcn-ee.com/ >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
