clk: Ingenic: Add RTC related clocks for Ingenic SoCs.
The RTC unit in the Ingenic SoCs has two clock sources, one is from an external 32.768kHz clock, and the other is from an external 24MHz/48MHz main clock that is divided by 512. The choice of these two clocks is controlled by the ERCS bit in the OPCR register. The RNG unit will also use this clock. Tested-by:周正 (Zhou Zheng) <sernia.zhou@foxmail.com> Signed-off-by:
周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com> Link: https://lore.kernel.org/r/20200725051136.58220-4-zhouyanjie@wanyeetech.comSigned-off-by:
Stephen Boyd <sboyd@kernel.org>
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