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

Frank Li
2026-03-30T14:40:48Z

On Mon, Mar 30, 2026 at 10:15:35AM +0200, Stefano Radaelli wrote:
> 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.

Okay, it'd better to emphrase it in commit message because _SEL is miss
leasing.

Frank
>
> Best Regards,
> Stefano