Re: [PATCH] spi: spi-fsl-dspi: Add ACPI support

[Vladimir Oltean]

On Wed, Aug 26, 2020 at 10:34:04PM +0300, Andy Shevchenko wrote:
> On Sat, Aug 22, 2020 at 9:37 PM Vladimir Oltean <olteanv@xxxxxxxxx> wrote:
> > On Fri, Aug 21, 2020 at 06:40:29PM +0530, kuldip dwivedi wrote:
>
> > Just noticed this now.
> > So for device tree, spi-fsl-dspi supports the following compatibles:
> >
> > fsl,vf610-dspi
> > fsl,ls1021a-v1.0-dspi
> > fsl,ls1012a-dspi
> > fsl,ls1028a-dspi
> > fsl,ls1043a-dspi
> > fsl,ls1046a-dspi
> > fsl,ls2080a-dspi
> > fsl,ls2085a-dspi
> > fsl,lx2160a-dspi
> >
> > Depending on the compatible string, the driver knows whether to use DMA
> > or XSPI mode, and what the FIFO size is.
> >
> > Now, of course not all of the above SoCs are going to support ACPI, but
> > it is reasonable to expect that more than one will. And in that case,
> > the driver should still be able to know on what SoC it's running,
> > because for example LS1043A doesn't support DMA, and LS2085A doesn't
> > support XSPI.
> >
> > How is this dealt with in ACPI?
>
> Theoretically you may declare your HID in the same / similar way as
> PRP0001 and use same compatible strings and all other DT properties
> (when they make sense and not duplicate ACPI functionality).
> But better if ACPI people can tell you (I Cc'ed Rafael and ACPI
> mailing list) if it is gonna work.
>

Something doesn't look right about PRP0001, what's the catch?