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The difference between 8 and 16 pin GPIO expanders can be accomodated by
the means of regmap API without resorting to using driver-specific
read/write accessors. This change, IMHO, brings the following benefits:
- Replaces driver's idiosyncratic way of dealing with
mult-register fields with regmap API, which, hopefuly,
makes the code a bit easier for a new reader to understand
- Removes various multi-read for-loop register read logic
from various places in the code and puts it in a signle
place
- Removes ad-hoc IRQ register caching code in
sx150x_irq_bus_sync_unlock, since that functionality is
provided by regmap
Besided aforementioned benefits this change also implements necessary
RegSense byte swap necessary for SX1503 and SX1506 variants of the chip.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
6489677f86