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gpio: at91: Fix pullup/pulldown configuration on PIO3

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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 Bießmann <andreas.devel@googlemail.com>
Cc: Josh Wu <josh.wu@atmel.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
This commit is contained in:
Marek Vasut 2016-05-04 23:05:23 +02:00 committed by Andreas Bießmann
parent 6b3943f1b0
commit 152ac5fabf
1 changed files with 8 additions and 3 deletions
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11
drivers/gpio/at91_gpio.c
View file

@ -59,6 +59,11 @@ int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup)
{
struct at91_port *at91_port = at91_pio_get_port(port);
#if defined(CPU_HAS_PIO3)
if (use_pullup)
at91_set_pio_pulldown(port, pin, 0);
#endif
if (at91_port && (pin < GPIO_PER_BANK))
at91_set_port_pullup(at91_port, pin, use_pullup);
@ -305,10 +310,10 @@ int at91_set_pio_pulldown(unsigned port, unsigned pin, int is_on)
if (at91_port && (pin < GPIO_PER_BANK)) {
mask = 1 << pin;
writel(mask, &at91_port->pudr);
if (is_on)
if (is_on) {
at91_set_pio_pullup(port, pin, 0);
writel(mask, &at91_port->ppder);
else
} else
writel(mask, &at91_port->ppddr);
}