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authorDavid Brownell <david-b@pacbell.net>2008-03-04 14:28:27 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:10 -0800
commit7560fa60fcdcdb0da662f6a9fad9064b554ef46c (patch)
tree2089d826b0b9230752f318b20884dca20b3847d5 /MAINTAINERS
parent83c7c693ed3e61535ad6a097ad991a88aafc54b8 (diff)
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gpio: <linux/gpio.h> and "no GPIO support here" stubs
Add a <linux/gpio.h> defining fail/warn stubs for GPIO calls on platforms that don't support the GPIO programming interface. That includes the arch-specific implementation glue otherwise. This facilitates a new model for GPIO usage: drivers that can use GPIOs if they're available, but don't require them. One example of such a driver is NAND driver for various FreeScale chips. On platforms update with GPIO support, they can be used instead of a worst-case delay to verify that the BUSY signal is off. (Also includes a couple minor unrelated doc updates.) 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>
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