From: ryan@bluewatersys•com (Ryan Mallon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] pio: add arch specific gpio_is_valid() function
Date: Tue, 07 Sep 2010 14:44:47 +1200 [thread overview]
Message-ID: <4C85A71F.3010402@bluewatersys.com> (raw)
In-Reply-To: <280328.53116.qm@web180311.mail.gq1.yahoo.com>
On 09/07/2010 02:23 PM, David Brownell wrote:
> Still not liking or accepting this proposed
> change to the GPIO framework.
>
> For the AT91 case (where integers 0..N are
> IRQs, but N..max are GPIOs)
>
> A simpler solution is just to use a bit in
> the integer to indicate IRQ vs GPIO. Like
> maybe the sign bit.. which is never set on
> valid GPIO numbers, but platforms could let
> be set on IRQs.
>
How about this approach instead?
----
On some architectures gpio numbering does not start from zero. Allow for
correct behaviour of gpio_is_valid on values below the first gpio by
adding the architecture overrideable ARCH_FIRST_GPIO.
Signed-off-by: Ryan Mallon <ryan@bluewatersys•com>
----
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index c7376bf..01aab1f 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -22,10 +22,15 @@
#define ARCH_NR_GPIOS 256
#endif
+#ifndef ARCH_FIRST_GPIO
+#define ARCH_FIRST_GPIO 0
+#endif
+
static inline int gpio_is_valid(int number)
{
/* only some non-negative numbers are valid */
- return ((unsigned)number) < ARCH_NR_GPIOS;
+ return (number >= ARCH_FIRST_GPIO &&
+ (unsigned)number < ARCH_NR_GPIOS;
}
struct device;
next prev parent reply other threads:[~2010-09-07 2:44 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090930155557.7dae503b@hskinnemoen-d830>
2009-10-23 16:34 ` [PATCH 0/2 v2]mmc: atmel-mci: introduce MCI2 support on at91 Nicolas Ferre
2009-10-23 16:34 ` [PATCH 1/3 v2] atmel-mci: change use of dma slave interface Nicolas Ferre
2009-10-23 16:34 ` [PATCH 2/3 v2] mmc: atmel-mci: New MCI2 module support in atmel-mci driver Nicolas Ferre
2009-11-02 17:18 ` Nicolas Ferre
2009-11-18 13:33 ` Nicolas Ferre
2009-10-23 16:34 ` [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in at91sam9g45 chip and board Nicolas Ferre
2009-10-26 8:15 ` Yegor Yefremov
2009-11-02 17:14 ` Nicolas Ferre
2009-10-27 19:43 ` Andrew Victor
2009-10-28 0:35 ` Haavard Skinnemoen
2009-10-28 0:53 ` Thiago A. Corrêa
2009-10-28 1:31 ` Haavard Skinnemoen
2009-10-28 19:53 ` Andrew Victor
2009-10-28 20:50 ` Ben Nizette
2009-11-02 17:11 ` Nicolas Ferre
2009-11-02 22:10 ` Ben Nizette
2009-11-02 22:14 ` Ben Nizette
2009-11-03 2:30 ` Ryan Mallon
2009-11-03 2:55 ` Ben Nizette
2009-11-07 11:20 ` Haavard Skinnemoen
2010-08-23 15:01 ` [PATCH] pio: add arch specific gpio_is_valid() function Nicolas Ferre
2010-08-23 16:36 ` David Brownell
2010-08-24 8:19 ` Nicolas Ferre
2010-09-06 14:21 ` [PATCH v2] AT91: pio: add " Nicolas Ferre
2010-09-07 1:51 ` David Brownell
2010-09-03 16:41 ` [PATCH] pio: add arch specific " Jean-Christophe PLAGNIOL-VILLARD
2010-09-07 2:23 ` David Brownell
2010-09-07 2:44 ` Ryan Mallon [this message]
2010-09-07 3:54 ` Eric Miao
2010-09-07 4:07 ` Ryan Mallon
2010-09-07 4:19 ` Eric Miao
2010-09-07 4:26 ` Ryan Mallon
2010-09-07 18:10 ` David Brownell
2010-09-07 19:13 ` avictor.za at gmail.com
2010-09-07 19:30 ` Ryan Mallon
2010-09-07 21:22 ` Alan Cox
2010-09-07 23:44 ` David Brownell
2010-09-08 0:11 ` Alan Cox
2010-09-07 6:33 ` David Brownell
2010-09-07 8:41 ` Ben Nizette
2010-09-07 17:32 ` David Brownell
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