From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guennadi Liakhovetski Subject: Re: [PATCH] Define a NO_GPIO macro to compare against and to use as an invalid GPIO Date: Thu, 7 Feb 2008 16:24:48 +0100 (CET) Message-ID: References: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: David Brownell Cc: linux-kernel@vger.kernel.org, i2c@lm-sensors.org List-Id: linux-i2c@vger.kernel.org On Thu, 31 Jan 2008, Guennadi Liakhovetski wrote: > As discussed on i2c mailing list with David Brownell, and number > outside of the 0...MAX_INT range is invalid as a GPIO number. > Define a macro, similar to NO_IRQ, to be used as a deliberate > invalid GPIO, rather than defining a is_valid_gpio() macro. David, I think, your ack is required on this one. Can we get it in, please? My soc-camera patches are accepted by the v4l maintainer, and without this one the series would be incomplete. Thanks Guennadi > Signed-off-by: Guennadi Liakhovetski > > --- > > As gpiolib doesn't seem to have an own mailing list, sending it directly > to LKML. > > include/asm-generic/gpio.h | 4 ++++ > 1 files changed, 4 insertions(+), 0 deletions(-) > > diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h > index f29a502..806b86c 100644 > --- a/include/asm-generic/gpio.h > +++ b/include/asm-generic/gpio.h > @@ -16,6 +16,10 @@ > #define ARCH_NR_GPIOS 256 > #endif > > +#ifndef NO_GPIO > +#define NO_GPIO ((unsigned int)-1) > +#endif > + > struct seq_file; > > /** > -- > 1.5.3.4 > --- Guennadi Liakhovetski