diff options
Diffstat (limited to 'Documentation/gpio')
| -rw-r--r-- | Documentation/gpio/consumer.txt | 30 | ||||
| -rw-r--r-- | Documentation/gpio/gpio-legacy.txt | 9 | ||||
| -rw-r--r-- | Documentation/gpio/sysfs.txt | 8 |
3 files changed, 15 insertions, 32 deletions
diff --git a/Documentation/gpio/consumer.txt b/Documentation/gpio/consumer.txt index c21c1313f..75542b91b 100644 --- a/Documentation/gpio/consumer.txt +++ b/Documentation/gpio/consumer.txt @@ -241,18 +241,18 @@ Set multiple GPIO outputs with a single function call ----------------------------------------------------- The following functions set the output values of an array of GPIOs: - void gpiod_set_array(unsigned int array_size, - struct gpio_desc **desc_array, - int *value_array) - void gpiod_set_raw_array(unsigned int array_size, - struct gpio_desc **desc_array, - int *value_array) - void gpiod_set_array_cansleep(unsigned int array_size, - struct gpio_desc **desc_array, - int *value_array) - void gpiod_set_raw_array_cansleep(unsigned int array_size, - struct gpio_desc **desc_array, - int *value_array) + void gpiod_set_array_value(unsigned int array_size, + struct gpio_desc **desc_array, + int *value_array) + void gpiod_set_raw_array_value(unsigned int array_size, + struct gpio_desc **desc_array, + int *value_array) + void gpiod_set_array_value_cansleep(unsigned int array_size, + struct gpio_desc **desc_array, + int *value_array) + void gpiod_set_raw_array_value_cansleep(unsigned int array_size, + struct gpio_desc **desc_array, + int *value_array) The array can be an arbitrary set of GPIOs. The functions will try to set GPIOs belonging to the same bank or chip simultaneously if supported by the @@ -271,8 +271,8 @@ matches the desired group of GPIOs, those GPIOs can be set by simply using the struct gpio_descs returned by gpiod_get_array(): struct gpio_descs *my_gpio_descs = gpiod_get_array(...); - gpiod_set_array(my_gpio_descs->ndescs, my_gpio_descs->desc, - my_gpio_values); + gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc, + my_gpio_values); It is also possible to set a completely arbitrary array of descriptors. The descriptors may be obtained using any combination of gpiod_get() and @@ -290,7 +290,7 @@ corresponding to a given GPIO using the following call: int gpiod_to_irq(const struct gpio_desc *desc) -It will return an IRQ number, or an negative errno code if the mapping can't be +It will return an IRQ number, or a negative errno code if the mapping can't be done (most likely because that particular GPIO cannot be used as IRQ). It is an unchecked error to use a GPIO that wasn't set up as an input using gpiod_direction_input(), or to use an IRQ number that didn't originally come diff --git a/Documentation/gpio/gpio-legacy.txt b/Documentation/gpio/gpio-legacy.txt index 6f83fa965..79ab5648d 100644 --- a/Documentation/gpio/gpio-legacy.txt +++ b/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. diff --git a/Documentation/gpio/sysfs.txt b/Documentation/gpio/sysfs.txt index c2c3a97f8..535b6a8a7 100644 --- a/Documentation/gpio/sysfs.txt +++ b/Documentation/gpio/sysfs.txt @@ -132,9 +132,6 @@ requested using gpio_request(): int gpiod_export_link(struct device *dev, const char *name, struct gpio_desc *desc); - /* change the polarity of a GPIO node in sysfs */ - int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value); - After a kernel driver requests a GPIO, it may only be made available in the sysfs interface by gpiod_export(). The driver can control whether the signal direction may change. This helps drivers prevent userspace code @@ -148,8 +145,3 @@ After the GPIO has been exported, gpiod_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 gpiod_sysfs_set_active_low() to hide GPIO line polarity -differences between boards from user space. Polarity change can be done both -before and after gpiod_export(), and previously enabled poll(2) support for -either rising or falling edge will be reconfigured to follow this setting. |