Document gpio-ranges property in pl061-gpio.txt
Signed-off-by: NYunlei He <heyunlei@huawei.com>
Signed-off-by: NXinwei Kong <kong.kongxinwei@hisilicon.com>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>