linux-kernel - Re: [PATCH] ARM: at91: spi: request all csgpio in spi probe

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Date:	Thu, 31 Jul 2014 18:48:37 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	devicetree@...r.kernel.org,
	Jiří Prchal <jiri.prchal@...ignal.cz>,
	Nicolas FERRE <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	voice.shen@...el.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: at91: spi: request all csgpio in spi probe

On 01/08/2014 at 00:10:05 +0800, Jean-Christophe PLAGNIOL-VILLARD wrote :
> >>> While this solves the particular issue Jiří is seeing, this will not
> >>> solve the case where PA14 (CS0) is not used by the spi driver at all. It
> >>> will remained muxed as CS0 and toggle when the spi master needs to
> >>> access CS0 until another driver muxes it to something else. I still
> >>> believe we should explicitly ask pinctrl to mux them as gpios.
> 
> This is not the job of the kernel but to the bootloader
> no the pinctrl binding is not here and will never be here the configure a pin as a GPIO or

This is exactly what AT91_PERIPH_GPIO does though. Anyway, not request
the pinmuxing in the driver is not a good idea, then nothing prevents
another driver to request them to do something completely different.

> to a specific state. This the job of the driver or the bootloader
> 

I agree that it must not allow to set the state, we are talking about
muxing.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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