linux-kernel - Re: [PATCH 1/5] spi: do not fail if the CS line is not connected

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Date:	Fri, 17 Jun 2016 11:47:25 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Andi Shyti <andi.shyti@...sung.com>
Cc:	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Andi Shyti <andi@...zian.org>
Subject: Re: [PATCH 1/5] spi: do not fail if the CS line is not connected

On Fri, Jun 17, 2016 at 04:57:21PM +0900, Andi Shyti wrote:
> Some SPI connected devices do not have any CS line connected as
> some devices are alway enabled. Indeed, until now, a common
> workaround was to assign to num_chipselect a -1 value or 255
> (num_chipselect is unsigned).
> 
> In this case do not fail and defer to the SPI device drivers the
> responsibility to check whether the num-cs is '0'.

A SPI controller always has one chip seelct, it may not be controllable
but it's at least logically present.

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