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feat(display): Add ability to set display on/off pin. (#2814)

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Zephyr is still working on the plan upstream for generically controlling
display "backlight" pins with GPIO/PWM, so in the meantime, add our
own chosen property `zmk,display-led` that is set to an LED device child
to allow blanking/unblanking of devices that use a dedicated backlight
control pin.
This commit is contained in:
Pete Johanson
2025-02-07 17:49:30 -07:00
committed by GitHub
parent 424e53210e
commit 627e6dbec9
2 changed files with 24 additions and 0 deletions
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docs/docs/config/displays.md
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@@ -62,3 +62,12 @@ See the Devicetree bindings for your display. Here are the bindings for common d
- [SSD1306 (spi)](https://docs.zephyrproject.org/3.5.0/build/dts/api/bindings/display/solomon,ssd1306fb-spi.html)
A full list of drivers provided by Zephyr can be found in [Zephyr's Devicetree bindings index](https://docs.zephyrproject.org/3.5.0/build/dts/api/bindings.html).
### Chosen nodes
Applies to: [`/chosen` node](https://docs.zephyrproject.org/3.5.0/build/dts/intro-syntax-structure.html#aliases-and-chosen-nodes)
| Property | Type | Description |
| ----------------- | ---- | -------------------------------------------------------------------------------------------------------- |
| `zephyr,display` | path | The display device to use. |
| `zmk,display-led` | path | The LED device to use for on/off blanking, if the hardware requires it. Can be a PWM or GPIO LED device. |