Re: [PATCH v4 01/10] i3c: Add core I3C infrastructure

From: Wolfram Sang
Date: Thu Jun 14 2018 - 04:16:00 EST

> > I don't know if typical I3C transfers will be similar to I2C with
> > usually small payloads where DMA usually makes not much sense. Yet, I
> > think, that it might be a good idea to think about how this shall be
> > handled with I3C right away. Maybe simply enforcing buffers to be
> > DMA-safe. Or whatever.
> >
> > A clear rule on that might save you hazzle later.
> I completely agree. I'll clarify that and for people to pass DMA-able
> buffers to this struct (just as the SPI framework does). Note that we

Ok, cool!

> don't really have a way to ensure that the buffer is actually
> DMA-safe from the core, because this notion is architecture/SoC
> dependent.

True, we can't ensure it at the core. Still, a documented rule will make
it clear that everything else is considered a bug. Much better than a
gray area you have to deal with later.

Kind regards,


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