pinctrl: mcp23s08: add pinconf support
mcp23xxx device have configurable 100k pullup resistors. This adds support for enabling them using pinctrl's pinconf interface. Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk> Tested-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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