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From: Linus Walleij <linus.walleij@linaro.org>
To: Roland Stigge <stigge@antcom.de>,
	Mark Brown <broonie@opensource.wolfsonmicro.com>,
	Grant Likely <grant.likely@secretlab.ca>
Cc: cjb@laptop.org, rob.herring@calxeda.com,
	rmk+kernel@arm.linux.org.uk, ulf.hansson@stericsson.com,
	linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
	aletes.xgr@gmail.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RESEND] gpio: of_get_named_gpio_flags() return -EPROBE_DEFER if GPIO not yet available
Date: Sat, 14 Jul 2012 21:57:08 +0200	[thread overview]
Message-ID: <CACRpkdYrZizqvZqsocLEGrkY5yPMuYFfmR3UUSFZgPDvEPa0eA@mail.gmail.com> (raw)
In-Reply-To: <1340836334-20427-1-git-send-email-stigge@antcom.de>

On Thu, Jun 28, 2012 at 12:32 AM, Roland Stigge <stigge@antcom.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@antcom.de>
> Acked-by: Linus Walleij <linus.walleij@linaro.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

WARNING: multiple messages have this Message-ID (diff)
From: linus.walleij@linaro.org (Linus Walleij)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RESEND] gpio: of_get_named_gpio_flags() return -EPROBE_DEFER if GPIO not yet available
Date: Sat, 14 Jul 2012 21:57:08 +0200	[thread overview]
Message-ID: <CACRpkdYrZizqvZqsocLEGrkY5yPMuYFfmR3UUSFZgPDvEPa0eA@mail.gmail.com> (raw)
In-Reply-To: <1340836334-20427-1-git-send-email-stigge@antcom.de>

On Thu, Jun 28, 2012 at 12:32 AM, Roland Stigge <stigge@antcom.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@antcom.de>
> Acked-by: Linus Walleij <linus.walleij@linaro.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

  reply	other threads:[~2012-07-14 19:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-27 22:32 [PATCH RESEND] gpio: of_get_named_gpio_flags() return -EPROBE_DEFER if GPIO not yet available Roland Stigge
2012-06-27 22:32 ` Roland Stigge
2012-07-14 19:57 ` Linus Walleij [this message]
2012-07-14 19:57   ` Linus Walleij
2012-07-15 21:11   ` Mark Brown
2012-07-15 21:11     ` Mark Brown
2012-07-16 22:16     ` Linus Walleij
2012-07-16 22:16       ` Linus Walleij
2012-07-17  7:43       ` Mark Brown
2012-07-17  7:43         ` Mark Brown
2012-07-17  7:43         ` Mark Brown
2012-07-17 18:17         ` Linus Walleij
2012-07-17 18:17           ` Linus Walleij
2012-07-17 18:24 ` Linus Walleij
2012-07-17 18:24   ` Linus Walleij
2012-07-17 18:30   ` Alexandre Pereira da Silva
2012-07-17 18:30     ` Alexandre Pereira da Silva

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