Re: [PATCH v2 2/2] iio: accel: Add driver support for ADXL355

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On Fri, 23 Jul 2021 18:14:22 +0100
Mark Brown <broonie@xxxxxxxxxx> wrote:

> On Fri, Jul 23, 2021 at 06:10:22PM +0100, Jonathan Cameron wrote:
> 
> > @Mark.  This has come up a few times recently.  Are we now safe to assume
> > that regmap will always copy data when used with SPI and hence we no
> > longer need to ensure DMA safe buffers?     
> 
> Only for single register I/O, I'd not assume that for things like raw
> I/O.

Thanks for the confirmation.  So in this driver that means we
need DMA safe buffers for the regmap_bulk_ calls.  Easiest approach
is probably to use a __cacheline_aligned buffer at the end of the
iio_priv() structure.

> 
> Note that my name is spelt Mark.
> 

I'll blame Friday.

Thanks,

Jonathan





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