diff options
Diffstat (limited to 'Documentation/gpio/board.txt')
| -rw-r--r-- | Documentation/gpio/board.txt | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/Documentation/gpio/board.txt b/Documentation/gpio/board.txt index 3092178628c4..86d3fa95fd12 100644 --- a/Documentation/gpio/board.txt +++ b/Documentation/gpio/board.txt @@ -111,16 +111,13 @@ files that desire to do so need to include the following header: GPIOs are mapped by the means of tables of lookups, containing instances of the gpiod_lookup structure. Two macros are defined to help declaring such mappings: - GPIO_LOOKUP(chip_label, chip_hwnum, dev_id, con_id, flags) - GPIO_LOOKUP_IDX(chip_label, chip_hwnum, dev_id, con_id, idx, flags) + GPIO_LOOKUP(chip_label, chip_hwnum, con_id, flags) + GPIO_LOOKUP_IDX(chip_label, chip_hwnum, con_id, idx, flags) where - chip_label is the label of the gpiod_chip instance providing the GPIO - chip_hwnum is the hardware number of the GPIO within the chip - - dev_id is the identifier of the device that will make use of this GPIO. It - can be NULL, in which case it will be matched for calls to gpiod_get() - with a NULL device. - con_id is the name of the GPIO function from the device point of view. It can be NULL, in which case it will match any function. - idx is the index of the GPIO within the function. @@ -134,7 +131,9 @@ In the future, these flags might be extended to support more properties. Note that GPIO_LOOKUP() is just a shortcut to GPIO_LOOKUP_IDX() where idx = 0. A lookup table can then be defined as follows, with an empty entry defining its -end: +end. The 'dev_id' field of the table is the identifier of the device that will +make use of these GPIOs. It can be NULL, in which case it will be matched for +calls to gpiod_get() with a NULL device. struct gpiod_lookup_table gpios_table = { .dev_id = "foo.0", |