• David Brownell's avatar
    gpiolib: avr32 at32ap platform support · b98348bd
    David Brownell authored
    Teach AVR32 to use the "GPIO Library" when exposing its GPIOs, so that signals
    on external chips (like GPIO expanders) can easily be used.
    
    This mostly reorganizes some existing logic, with two minor changes in
    behavior:
    
     - The PSR registers are used instead of the previous "gpio_mask" values,
       matching AT91 behavior and removing some duplication between that role
       and that of "pinmux_mask".
    
     - NR_IRQs grew to acommodate a bank of external GPIOs.  Eventually this
       number should probably become a board-specific config option.
    
    There's a debugfs dump of status for the built-in GPIOs, showing which pins
    have deglitching, pullups, or open drain drive enabled, as well as the ID
    string used when requesting each IRQ.
    Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
    Acked-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
    Cc: Jean Delvare <khali@linux-fr.org>
    Cc: Eric Miao <eric.miao@marvell.com>
    Cc: Sam Ravnborg <sam@ravnborg.org>
    Cc: Philipp Zabel <philipp.zabel@gmail.com>
    Cc: Russell King <rmk@arm.linux.org.uk>
    Cc: Ben Gardner <bgardner@wabtec.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    b98348bd
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