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rtc: sprd: Add new RTC power down check method
We should use the new method to check if RTC was powered down, which is more solid. Since we have introduced power control and power status registers, and we just check if the power status is the default value (0x96), if yes that means the RTC has been powered down. Meanwhile We can set the power control register to be one valid value to change the power status to indicate RTC device is valid now. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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Baolin Wang
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Alexandre Belloni
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May 31, 2018
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