at32ap700x spi: enable pullups on MISO

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This is a minor tweak to the at32ap700x pin configuration for the SPI
input pin (MISO), enabling the on-chip weak pullup (typical 190K) to

  (a) ensure a fixed data value for missing or input-only slaves;

  (b) prevent power waste associated with inputs floating near VDDIO/2.

Atmel's boards have no external pullup or pulldown on these pins, so
it's unlikely other boards would address these issues with external
pulldowns.  Were there trouble, board-specific code could turn off
the relevant pullup(s).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

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David Brownell 2008-06-18 02:31:43 -07:00 • committed by Haavard Skinnemoen

parent 7ef31e9c4e

commit 9c2baf785e

1 changed files with 4 additions and 2 deletions

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arch/avr32/mach-at32ap/at32ap700x.c

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