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From: Mark Brown <broonie@kernel.org>
To: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: Puranjay Mohan <puranjay12@gmail.com>,
	Michael.Hennerich@analog.com, alexandru.ardelean@analog.com,
	jic23@kernel.org, devicetree@vger.kernel.org,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
	lars@metafoo.de, Dragos.Bogdan@analog.com,
	Darius.Berghe@analog.com
Subject: Re: [PATCH v2 2/2] iio: accel: Add driver support for ADXL355
Date: Fri, 23 Jul 2021 18:47:51 +0100	[thread overview]
Message-ID: <20210723174751.GL5221@sirena.org.uk> (raw)
In-Reply-To: <20210723184404.0000001d@Huawei.com>

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On Fri, Jul 23, 2021 at 06:44:04PM +0100, Jonathan Cameron wrote:
> Mark Brown <broonie@kernel.org> 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.

Yeah, it might be fine depending on the bus/format type but it's not
something you can generally assume.

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  reply	other threads:[~2021-07-23 17:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22  6:21 [PATCH v2 0/2] iio: accel: add " Puranjay Mohan
2021-07-22  6:21 ` [PATCH v2 1/2] dt-bindings: iio: accel: Add ADXL355 in trivial-devices Puranjay Mohan
2021-07-23 16:29   ` Jonathan Cameron
2021-07-24 15:46     ` Puranjay Mohan
2021-07-22  6:21 ` [PATCH v2 2/2] iio: accel: Add driver support for ADXL355 Puranjay Mohan
2021-07-22  7:10   ` Alexandru Ardelean
2021-07-23 16:28     ` Jonathan Cameron
2021-07-23 17:10   ` Jonathan Cameron
2021-07-23 17:14     ` Mark Brown
2021-07-23 17:44       ` Jonathan Cameron
2021-07-23 17:47         ` Mark Brown [this message]
2021-07-24 15:53     ` Puranjay Mohan
2021-07-25 15:17       ` Jonathan Cameron

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