Re: [PATCH v1 1/1] arm64: dts: imx91-var-dart-sonata: add RGB select supply for PCA6408

[Stefano Radaelli]

Hi Frank,

On Fri, Mar 27, 2026 at 02:41:21PM -0400, Frank Li wrote:
> 
> Accroding to signal name, it is MUX chip select signal. Of couse it may
> connect to a buffer's EN pin. I have not checked your schematic.
> 
> If it connect to MUX chip or some select signal, it should use above method,
> even though it is permanently asserted when access PCA6408.
> 
> If it connect to EN pin of buffer, regualtor should be good.
> 

Yes, it is exactly the second case!
It's just an EN pin, that enables a buffer to route RGB signals used on
the DART-MX91 som only.
That's why I think regulator is the right way for this case.

Best Regards,
Stefano