[U-Boot] gpio: at91: Fix pullup/pulldown configuration on PIO3

["Andreas Bießmann" <andreas@biessmann.org>]

Dear Marek Vasut,

Marek Vasut <marex@denx.de> writes:
>On systems with PIO3 (SAMA5D3/D4/..), the pullup and pulldown configuration
>is mutualy exclusive. This patch assures that the opposite pull resistor gets
>disabled before the requested pull resistor is enabled. This changes behavior
>of at91_set_pio_pulldown() such that the pullup is only disabled if pulldown
>is to be enabled. This changes behavior of at91_set_pio_pullup() such that
>the pulldown is only disabled if pullup is to be enabled.
>
>Signed-off-by: Marek Vasut <marex@denx.de>
>Cc: Andreas Bie?mann <andreas.devel@googlemail.com>
>Cc: Josh Wu <josh.wu@atmel.com>
>Cc: Simon Glass <sjg@chromium.org>
>Reviewed-by: Andreas Bie?mann <andreas@biessmann.org>
>---
> drivers/gpio/at91_gpio.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)

applied to u-boot-atmel/master, thanks!

Best regards,
Andreas Bie?mann