diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2013-12-03 12:20:11 +0900 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-12-09 14:05:51 +0100 |
| commit | ad824783fb23bbc8295cffb6214b3b82d25f7d4a (patch) | |
| tree | 745d128c1d04dca7a6c7b10dd737f116f13ddcb1 /include/linux/gpio | |
| parent | bdc54ef45d7670aeb52ce73f8b7ad5f3e5563661 (diff) | |
gpio: better lookup method for platform GPIOs
Change the format of the platform GPIO lookup tables to make them less
confusing and improve lookup efficiency.
The previous format was a single linked-list that required to compare
the device name and function ID of every single GPIO defined for each
lookup. Switch that to a list of per-device tables, so that the lookup
can be done in two steps, omitting the GPIOs that are not relevant for a
particular device.
The matching rules are now defined as follows:
- The device name must match *exactly*, and can be NULL for GPIOs not
assigned to a particular device,
- If the function ID in the lookup table is NULL, the con_id argument of
gpiod_get() will not be used for lookup. However, if it is defined, it
must match exactly.
- The index must always match.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/gpio')
| -rw-r--r-- | include/linux/gpio/driver.h | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index c849676c6787..44c66b29a2d9 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -141,7 +141,6 @@ enum gpio_lookup_flags { * platform data. */ struct gpiod_lookup { - struct list_head list; /* * name of the chip the GPIO belongs to */ @@ -151,10 +150,6 @@ struct gpiod_lookup { */ u16 chip_hwnum; /* - * name of device that can claim this GPIO - */ - const char *dev_id; - /* * name of the GPIO from the device's point of view */ const char *con_id; @@ -168,28 +163,32 @@ struct gpiod_lookup { enum gpio_lookup_flags flags; }; +struct gpiod_lookup_table { + struct list_head list; + const char *dev_id; + struct gpiod_lookup table[]; +}; + /* * Simple definition of a single GPIO under a con_id */ -#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _dev_id, _con_id, _flags) \ - GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _dev_id, _con_id, 0, _flags) +#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \ + GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags) /* * Use this macro if you need to have several GPIOs under the same con_id. * Each GPIO needs to use a different index and can be accessed using * gpiod_get_index() */ -#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _dev_id, _con_id, _idx, \ - _flags) \ +#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags) \ { \ .chip_label = _chip_label, \ .chip_hwnum = _chip_hwnum, \ - .dev_id = _dev_id, \ .con_id = _con_id, \ .idx = _idx, \ .flags = _flags, \ } -void gpiod_add_table(struct gpiod_lookup *table, size_t size); +void gpiod_add_lookup_table(struct gpiod_lookup_table *table); #endif |