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gpio: gpio driver for max7301 SPI GPIO expander

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Maxim's MAX7301 is an SPI GPIO expander with 28 GPIOs.  Note: MAX7301's
interrupt feature is not supported yet.

[akpm@linux-foundation.org: coding-style fixes]
[g.liakhovetski@pengutronix.de: Fix inaccuracies in comments, check spi_setup()
return code, mask off high byte in max7301_read()]
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Juergen Beisert
2008-07-21 14:21:34 -07:00
committed by Linus Torvalds
parent 6519108746
commit 0c36ec3147
4 changed files with 355 additions and 0 deletions
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9
include/linux/spi/max7301.h Normal file
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@@ -0,0 +1,9 @@
#ifndef LINUX_SPI_MAX7301_H
#define LINUX_SPI_MAX7301_H
struct max7301_platform_data {
/* number assigned to the first GPIO */
unsigned base;
};
#endif