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

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Message-ID: <CACRpkdYrZizqvZqsocLEGrkY5yPMuYFfmR3UUSFZgPDvEPa0eA@mail.gmail.com>
Date:	Sat, 14 Jul 2012 21:57:08 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Roland Stigge <stigge@...com.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	cjb@...top.org, rob.herring@...xeda.com,
	rmk+kernel@....linux.org.uk, ulf.hansson@...ricsson.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	aletes.xgr@...il.com, 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 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>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>

If I understand correctly this relates closely to another patch from Mark Brown
we discussed the other day (sorry for missing this patch, which arrived
earlier, for a while).

Mark/Grant can you look at this patch?

Yours,
Linus Walleij
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