• David Brownell's avatar
    [PATCH] GPIO core · 4c20386c
    David Brownell authored
    This defines a simple and minimalist programming interface for GPIO APIs:
    
      - Documentation/gpio.txt ... describes things (read it)
    
      - include/asm-arm/gpio.h ... defines the ARM hook, which just punts
        to <asm/arch/gpio.h> for any implementation
    
      - include/asm-generic/gpio.h ... implement "can sleep" variants as calling
        the normal ones, for systems that don't handle i2c expanders.
    
    The immediate need for such a cross-architecture API convention is to support
    drivers that work the same on AT91 ARM and AVR32 AP7000 chips, which embed many
    of the same controllers but have different CPUs.  However, several other users
    have been reported, including a driver for a hardware watchdog chip and some
    handhelds.org multi-CPU button drivers.
    Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    4c20386c
gpio.h 170 Bytes