gpio: add gpio offset in gpio range cells property
Add gpio offset into "gpio-range-cells" property. It's used to support sparse pinctrl range in gpio chip. Signed-off-by: NHaojian Zhuang <haojian.zhuang@linaro.org> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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