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gpiolib: add support for bias pull disable

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This change prepares the gpio core to look at firmware flags and set
'FLAG_BIAS_DISABLE' if necessary. It works in similar way to
'GPIO_PULL_DOWN' and 'GPIO_PULL_UP'.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Nuno Sá 2022-07-13 15:14:18 +02:00 committed by Bartosz Golaszewski
parent 28ba057456
commit c269df8c5a
2 changed files with 7 additions and 2 deletions
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8
drivers/gpio/gpiolib.c
View File

@ -3945,9 +3945,11 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
if (lflags & GPIO_OPEN_SOURCE)
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) {
if (((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) ||
((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DISABLE)) ||
((lflags & GPIO_PULL_DOWN) && (lflags & GPIO_PULL_DISABLE))) {
gpiod_err(desc,
"both pull-up and pull-down enabled, invalid configuration\n");
"multiple pull-up, pull-down or pull-disable enabled, invalid configuration\n");
return -EINVAL;
}
@ -3955,6 +3957,8 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
set_bit(FLAG_PULL_UP, &desc->flags);
else if (lflags & GPIO_PULL_DOWN)
set_bit(FLAG_PULL_DOWN, &desc->flags);
else if (lflags & GPIO_PULL_DISABLE)
set_bit(FLAG_BIAS_DISABLE, &desc->flags);
ret = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY));
if (ret < 0)

1
include/linux/gpio/machine.h
View File

@ -14,6 +14,7 @@ enum gpio_lookup_flags {
GPIO_TRANSITORY = (1 << 3),
GPIO_PULL_UP = (1 << 4),
GPIO_PULL_DOWN = (1 << 5),
GPIO_PULL_DISABLE = (1 << 6),
GPIO_LOOKUP_FLAGS_DEFAULT = GPIO_ACTIVE_HIGH | GPIO_PERSISTENT,
};