Re: [PATCHv2 9/9] spi: spidev: add Aardvark to device tree compatibility list

From	Mark Brown <broonie@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCHv2 9/9] spi: spidev: add Aardvark to device tree compatibility list
Date	2017-06-30 14:00 +0200
Message-ID	<tY2KC-50c-23@gated-at.bofh.it> (permalink)
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On Thu, Jun 29, 2017 at 02:58:43PM +0200, Amelie DELAUNAY wrote:
> On 06/28/2017 08:54 PM, Mark Brown wrote:

> > What does this device actually do and why is spidev a sensible fit for
> > it?

> This device is actually a debugging tool [1] which can work on SPI bus (and
> also I2C). Connected via USB on a PC, it can either acts as an SPI master or
> SPI slave and it can transmit/receive serial data using SPI protocol.
> Polarity, Phase, Bit Order, Frequency can be configured. So this tool is
> really useful during SPI driver development to troubleshoot. And that's why
> spidev driver totally fit for it when used as an SPI slave, for the reason
> described in spidev Documentation: "Developing simple protocols used to talk
> to" Aardvark "acting as SPI slaves, which you may need to change quite
> often".

This doesn't seem like something that should be in DT, it's a tool used
to implement or emulate other things and is no more specific than spidev
itself is.  Whatever it is implementing or emulating should be in DT
instead.

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[PATCHv2 9/9] spi: spidev: add Aardvark to device tree compatibility list Amelie Delaunay <amelie.delaunay@st.com> - 2017-06-27 17:50 +0200
  Re: [PATCHv2 9/9] spi: spidev: add Aardvark to device tree  compatibility list Mark Brown <broonie@kernel.org> - 2017-06-28 21:30 +0200
    Re: [PATCHv2 9/9] spi: spidev: add Aardvark to device tree  compatibility list Amelie DELAUNAY <amelie.delaunay@st.com> - 2017-06-29 15:00 +0200
      Re: [PATCHv2 9/9] spi: spidev: add Aardvark to device tree  compatibility list Mark Brown <broonie@kernel.org> - 2017-06-30 14:00 +0200

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