linux-kernel - Re: [PATCH v6 0/9] i2c: document DMA handling and add helpers for it

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Date:   Mon, 4 Dec 2017 22:05:41 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-input@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v6 0/9] i2c: document DMA handling and add helpers for it

On Sun, Dec 03, 2017 at 08:43:47PM +0100, Wolfram Sang wrote:

> > It's a bit different in that it's much more likely that a SPI controller
> > will actually do DMA than an I2C one since the speeds are higher and
> > there's frequent applications that do large transfers so it's more
> > likely that people will do the right thing as issues would tend to come
> > up if they don't.

> Yes, for SPI this is true. I was thinking more of regmap with its
> usage of different transport mechanisms. But I guess they should all be
> DMA safe because some of them need to be DMA safe?

Possibly.  Hopefully.  I guess we'll find out.

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