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

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Date:	Tue, 17 Jul 2012 15:30:46 -0300
From:	Alexandre Pereira da Silva <aletes.xgr@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Roland Stigge <stigge@...com.de>, cjb@...top.org,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rmk+kernel@....linux.org.uk, ulf.hansson@...ricsson.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RESEND] gpio: of_get_named_gpio_flags() return
 -EPROBE_DEFER if GPIO not yet available

On Tue, Jul 17, 2012 at 3:24 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Thu, Jun 28, 2012 at 12:32 AM, Roland Stigge <stigge@...com.de> wrote:
>
>> of_get_named_gpio_flags() and of_get_named_gpio() return -EPROBE_DEFER if the
>> respective GPIO is not (yet) available. This is useful if driver's probe()
>> functions try to get a GPIO whose controller isn't probed yet. Thus, the driver
>> can be probed again later on.
>>
>> The function still returns -EINVAL on other errors (parse error or node doesn't
>> exist). This way, the case of an optional/intentionally missing GPIO is handled
>> appropriately.
>>
>> Signed-off-by: Roland Stigge <stigge@...com.de>
>
> Patch applied, if all gpio stuff shall defer properly in v3.6 we need this
> so let's do some testing in -next!
>
> Would be nice to get some ACK besides my own...

You can add mine. I've been using this patch for quite some time now.

Acked-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>

> Yours,
> Linus Walleij
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