linux-kernel - Re: [PATCH] gpio: of_get_named_gpio_flags() return -EPROBE

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Message-ID: <4FDF0FD7.3060004@antcom.de>
Date:	Mon, 18 Jun 2012 13:24:07 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	cjb@...top.org, grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rmk+kernel@....linux.org.uk, ulf.hansson@...ricsson.com,
	linus.walleij@...aro.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, aletes.xgr@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] gpio: of_get_named_gpio_flags() return -EPROBE_DEFER
 if GPIO not yet available

On 06/18/2012 11:19 AM, Roland Stigge wrote:
>> While I agree this is a correct change, it is going to break some
>> existing code - at least sound/soc/tegra/tegra_{wm8903.c,alc5632.c}.
> 
> Can you please tell in which way the patch breaks those drivers?
> However, I can see that those drivers solved the same problem in a
> different way (deferring of_get_named_gpio(), via the sound init()). So
> they could be adjusted to take advantage of new -EPROBE_DEFER
> 
>> However, have you audited all existing callers (including
>> indirect, e.g. through plain of_get_named_gpio()) for issues this will
>> cause?
> 
> Thanks for the hint, I searched the code and found
> 
> drivers/spi/spi-pl022.c
> 
> to be using -ENODEV as indication to return -EPROBE_DEFER from probe().
> Will send a patch that adjusts to our of_get_named_gpio_flags() patch
> and if it's good, we should join the two.

Turned out that this is a fix for a yet-unapplied patch (to support dt
for pl022). Alexandre will merge my fix into his patch.

So I can't find immediate breakage from the gpiolib-of patch.

Thanks,

Roland
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