Overlay -- set GPIO initial value

[Paul Beam]

I'm creating my first device tree overlay for the PocketBeagle intending to setup the I/O pins the way I need them without having to run an additional script to set things up.  I'm using this as a template:https://github.com/jadonk/validation-scripts/blob/master/test-capemgr/pinctrl-test-0.dts

Is it possible in the device tree overlay to not only set the mux setting, but also set the pin initial value?  For example, if I set a GPIO as an output, can I also set that output hi?

[TJF]

Hi!

rpau...@gmail.com schrieb am Donnerstag, 18. März 2021 um 16:06:43 UTC+1:

Is it possible in the device tree overlay to not only set the mux setting, but also set the pin initial value?  For example, if I set a GPIO as an output, can I also set that output hi?

No, that's not possible in device tree overlays. Only libpruio provides that feature.

[Robert Nelson]

On Thu, Mar 18, 2021 at 10:06 AM Paul Beam <rpau...@gmail.com> wrote:
>
> I'm creating my first device tree overlay for the PocketBeagle intending to setup the I/O pins the way I need them without having to run an additional script to set things up. I'm using this as a template:https://github.com/jadonk/validation-scripts/blob/master/test-capemgr/pinctrl-test-0.dts
>
> Is it possible in the device tree overlay to not only set the mux setting, but also set the pin initial value? For example, if I set a GPIO as an output, can I also set that output hi?

model it as a gpio-led, which has a default state..

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-RELAY-4PORT-00A0.dts#L89-L92

Regards,

--
Robert Nelson
https://rcn-ee.com/

[rpau...@gmail.com]

That’s interesting! I can't say that I perfectly understand all this. It seems that mastery (or at least competence) with the device tree takes a lot of time. I'm going to play with that example and see how it works. Thanks!

--
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