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| author | Ludovic Desroches <ludovic.desroches@atmel.com> | 2016-04-19 16:03:45 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-04-29 11:16:19 +0200 |
| commit | 5305a7b7e860bb40ab226bc7d58019416073948a (patch) | |
| tree | 5e101eb20cb494ff39a2de5e5c12897418ef9d73 /drivers/pinctrl/pinctrl-at91-pio4.c | |
| parent | 02da2d72174c61988eb4456b53f405e3ebdebce4 (diff) | |
| download | linux-5305a7b7e860bb40ab226bc7d58019416073948a.tar.bz2 | |
pinctrl: at91-pio4: fix pull-up/down logic
The default configuration of a pin is often with a value in the
pull-up/down field at chip reset. So, even if the internal logic of the
controller prevents writing a configuration with pull-up and pull-down at
the same time, we must ensure explicitly this condition before writing the
register.
This was leading to a pull-down condition not taken into account for
instance.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: 776180848b57 ("pinctrl: introduce driver for Atmel PIO4 controller")
Cc: stable@vger.kernel.org #v4.4 and later
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-at91-pio4.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-at91-pio4.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c index 4429312e848d..2c447130b954 100644 --- a/drivers/pinctrl/pinctrl-at91-pio4.c +++ b/drivers/pinctrl/pinctrl-at91-pio4.c @@ -722,9 +722,11 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev, break; case PIN_CONFIG_BIAS_PULL_UP: conf |= ATMEL_PIO_PUEN_MASK; + conf &= (~ATMEL_PIO_PDEN_MASK); break; case PIN_CONFIG_BIAS_PULL_DOWN: conf |= ATMEL_PIO_PDEN_MASK; + conf &= (~ATMEL_PIO_PUEN_MASK); break; case PIN_CONFIG_DRIVE_OPEN_DRAIN: if (arg == 0) |