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

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Message-ID: <20180614081541.zlxu6ga47gdg42un@ninjato>
Date:   Thu, 14 Jun 2018 17:15:42 +0900
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     linux-i2c@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v4 01/10] i3c: Add core I3C infrastructure


> > 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,

   Wolfram


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