dt-bindings: pinctrl: mcp23s08 update binding doc

The mcp23s08 driver moved to pinctrl recently. It accepts the
bias-pull-up pinctrl property since then. This updates the binding
doc to reflect that.

Thanks to Sebastian Reichel for the working example.

Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Lars Poeschel 2017-10-09 14:03:00 +02:00 • committed by Linus Walleij
commit e8527b6eb6