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Daniel Schaefer dd887eae36 [Core] Allow customizing PWM frequency (#21717) 
* [Core] Allow customizing PWM frequency

Some frequencies can cause audible noise. Changing the frequency
eliminates that.

Signed-off-by: Daniel Schaefer <dhs@frame.work>

* docs/feature-backlight: Mention PWM frequency

Signed-off-by: Daniel Schaefer <dhs@frame.work>

---------

Signed-off-by: Daniel Schaefer <dhs@frame.work>
 2023-09-03 14:56:02 +02:00
Daniel Schaefer 367b8e09d9 is31fl3741: Allow changing config register (#21861) 
When not all SW pins are used, it's useful to disable those that aren't.
Can reduce audible noise.

```
Layout:
D7:D4 D3  D2:D1 D0
SWD   LGC OSDE  SSD

SWS: SWx Setting. Change how many SW pins are active
LGC: H/L Logic
SSD: Software Shutdown Control
```

Signed-off-by: Daniel Schaefer <dhs@frame.work>
 2023-09-01 00:20:24 +01:00