Re: [PATCH] spi: dt-bindings: samsung: make dma properties not required

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On Fri, Mar 01, 2024 at 01:28:35PM -0600, Sam Protsenko wrote:
> On Fri, Mar 1, 2024 at 5:55 AM Tudor Ambarus <tudor.ambarus@xxxxxxxxxx> wrote:

> > Since the addition of the driver in 2009, the driver selects between DMA
> > and polling mode depending on the transfer length - DMA mode for
> > transfers bigger than the FIFO depth, polling mode otherwise. All
> > versions of the IP support polling mode, make the dma properties not
> > required.

> AFAIU, the device tree has nothing to do with drivers, it's about
> hardware description. Does making DMA properties not required here
> mean that there are some HW out there which doesn't integrate DMA in
> SPI blocks? Even if this change is ok (I'm not sure), the
> argumentation doesn't look sound to me.

I do remember there being some SoC which shipped a SPI controller in
that configuration for some reason.  Possibly one of the OEM ones rather
than one in a Samsung SoC?

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