Document DT files bindings for Hisilicon hi6220 clock.
Signed-off-by: NBintian Wang <bintian.wang@huawei.com>
Acked-by: NHaojian Zhuang <haojian.zhuang@linaro.org>
Suggested-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NStephen Boyd <sboyd@codeaurora.org>
Acked-by: NMichael Turquette <mturquette@linaro.org>
Signed-off-by: NWei Xu <xuwei5@hisilicon.com>