diff options
| author | Rasmus Villemoes <rasmus.villemoes@prevas.dk> | 2020-01-28 12:04:33 +0000 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-03-31 10:06:52 -0400 |
| commit | 1d7ad9fa051e5b3057bccb6384ab62e4f9c206b2 (patch) | |
| tree | e3da9dc2fa48eda040b20999cabb2fe3b74d365e /drivers/gpio | |
| parent | 71a3e5c51c96fe4011ef2cea8490e523786de863 (diff) | |
gpio: mpc8xxx: don't modify gpdat when setting gpio as input
Since some chips don't support reading back the value of output gpios
from the gpdat register, we should not do a RMW cycle (i.e., the
clrbits_be32) on the gpdat register when setting a gpio as input, as
that might accidentally change the value of some other (still
configured as output) gpio.
The extra indirection through mpc8xxx_gpio_set_in() does not help
readability, so just fold the gpdir update into
mpc8xxx_gpio_direction_input().
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/mpc8xxx_gpio.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/gpio/mpc8xxx_gpio.c b/drivers/gpio/mpc8xxx_gpio.c index c273c2c8a4..d4f3092df0 100644 --- a/drivers/gpio/mpc8xxx_gpio.c +++ b/drivers/gpio/mpc8xxx_gpio.c @@ -57,13 +57,6 @@ static inline u32 mpc8xxx_gpio_get_dir(struct ccsr_gpio *base, u32 mask) return in_be32(&base->gpdir) & mask; } -static inline void mpc8xxx_gpio_set_in(struct ccsr_gpio *base, u32 gpios) -{ - clrbits_be32(&base->gpdat, gpios); - /* GPDIR register 0 -> input */ - clrbits_be32(&base->gpdir, gpios); -} - static inline void mpc8xxx_gpio_set_low(struct ccsr_gpio *base, u32 gpios) { clrbits_be32(&base->gpdat, gpios); @@ -100,8 +93,11 @@ static inline void mpc8xxx_gpio_open_drain_off(struct ccsr_gpio *base, static int mpc8xxx_gpio_direction_input(struct udevice *dev, uint gpio) { struct mpc8xxx_gpio_data *data = dev_get_priv(dev); + u32 mask = gpio_mask(gpio); + + /* GPDIR register 0 -> input */ + clrbits_be32(&data->base->gpdir, mask); - mpc8xxx_gpio_set_in(data->base, gpio_mask(gpio)); return 0; } |