On Tue, Dec 3, 2013 at 4:20 AM, Alexandre Courbot [off-list ref] wrote:

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>
---
Changes since v2:
- Removed size member of the gpiod_lookup_table struct (thanks Heikki!)
- Added Andy's reviewed-by

OK looks good, however I must get my fixes stack to Torvalds
and pull -rc3 back in before I can apply this, it seems, as
it builds upon pending fixes.

Yours,
Linus Walleij