Yeah, as I was saying, I actually do remember how to do that, and successfully did. I still end up having to do the export and then other sysfs stuff to set the values.
Which, as I think about it, setting the values in the DTB is not so useful.* I do need to turn things on and off only under software control. But it'd be nice to get rid of the export step. *There are a couple of GPIOs that turn regulators on and enable some of my audio circuitry. In theory, I can build the device tree including those, and then the audio APIs turn them on automatically when audio is enabled. But I've had limited success with getting that right. > On Apr 3, 2016, at 17:26 , William Hermans <[email protected]> wrote: > > Here Rick, maybe this will refresh you on the subject. > http://stackoverflow.com/questions/16872763/configuring-pins-mode-beaglebone > second answer I think talks about device tree files, while the first one > talks about some crazy script method . . . > > But essentially, and I'm no expert here, and from the second answer . . . > > pinctrl-single,pins = < > 0x070 0x2f /* P9_11 30 INPUT MODE7 none */ > 0x074 0x2f /* P9_13 31 INPUT MODE7 none */ > 0x040 0x2f /* P9_15 48 INPUT MODE7 none */ > 0x15c 0x2f /* P9_17 05 INPUT MODE7 none */ > >; > > This in it's self does a lot of explaining here. Check out the comments for > each pin, and mode. > > On Sun, Apr 3, 2016 at 5:18 PM, Rick Mann <[email protected]> wrote: > > > On Apr 3, 2016, at 17:07 , William Hermans <[email protected]> wrote: > > > > Yes, it can be done. I thought you had all this down before ? You can > > configure what mode the pin is actually used for - The several different > > peripheral types per pin, or GPIO + pull up/down or neither, and pin > > direction. > > Sorry, I haven't been able to touch this since last summer, and I don't > always remember what I figured out. I do recall that I can set up the pin, > but I've never figured out for sure how to set the output state. > > Also, I've never succeeded in getting a full DTB working (one that sets up my > pins, ADC, PRU, and audio). I'm hoping enough progress has been made in the > kernels that I can finally get there. And I'm getting closer, just not quite > there yet. > > -- > Rick Mann > [email protected] > > > -- > 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. -- Rick Mann [email protected] -- 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.
