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Diffstat (limited to 'kernel/Documentation/gpio/gpio-legacy.txt')
| -rw-r--r-- | kernel/Documentation/gpio/gpio-legacy.txt | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/kernel/Documentation/gpio/gpio-legacy.txt b/kernel/Documentation/gpio/gpio-legacy.txt index 6f83fa965..79ab5648d 100644 --- a/kernel/Documentation/gpio/gpio-legacy.txt +++ b/kernel/Documentation/gpio/gpio-legacy.txt @@ -751,9 +751,6 @@ requested using gpio_request(): int gpio_export_link(struct device *dev, const char *name, unsigned gpio) - /* change the polarity of a GPIO node in sysfs */ - int gpio_sysfs_set_active_low(unsigned gpio, int value); - After a kernel driver requests a GPIO, it may only be made available in the sysfs interface by gpio_export(). The driver can control whether the signal direction may change. This helps drivers prevent userspace code @@ -767,9 +764,3 @@ After the GPIO has been exported, gpio_export_link() allows creating symlinks from elsewhere in sysfs to the GPIO sysfs node. Drivers can use this to provide the interface under their own device in sysfs with a descriptive name. - -Drivers can use gpio_sysfs_set_active_low() to hide GPIO line polarity -differences between boards from user space. This only affects the -sysfs interface. Polarity change can be done both before and after -gpio_export(), and previously enabled poll(2) support for either -rising or falling edge will be reconfigured to follow this setting. |