linux-kernel - Re: [PATCH 3/9] spi: sunxi: check that transfer speed is non-zero

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Message-ID: <CAOMqctSfdxWeWDogzHxONE+Qxf7vp6rJnBmxECV89PQO0hXARg@mail.gmail.com>
Date:	Thu, 20 Aug 2015 21:45:07 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.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>,
	Russell King <linux@....linux.org.uk>,
	Mark Brown <broonie@...nel.org>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH 3/9] spi: sunxi: check that transfer speed is non-zero

On 20 August 2015 at 16:48, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> On Thu, Aug 20, 2015 at 02:19:46PM -0000, Michal Suchanek wrote:
>> When the maximum transfer speed is not set for a SPI slave the value
>> remains 0 and the code in sunxi SPI divides by it. Use an arbitrary
>> speed instead in that case.
>>
>> Signed-off-by: Michal Suchanek <hramrach@...il.com>
>
> spi->max_speed_hz is set using the spi-max-frequency property, and
> spi->will error out if that property isn't set. What am I missing?
>

Spidev I guess.

You can set the speed to arbitrary value from userspace at any time
using the spidev ioctls.

Thanks

Michal
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