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.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>

---

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
--
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