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rockchip-kernel/drivers
Sergej Sawazki b26ff127c5 clk: si5351: Apply PLL soft reset before enabling the outputs
The "Si5351A/B/C Data Sheet" states to apply a PLL soft reset before
enabling the output clocks [1]. This is required to get a deterministic
phase relationship between the output clocks.

Without resetting the PLL, the phase relationship between the clocks is
unpredictable. Fix this by resetting the PLL in si5351_clkout_prepare().

References:
[1] https://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351-B.pdf
    Figure 12 ("I2C Programming Procedure")

Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: Rabeeh Khoury <rabeeh@solid-run.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Sergej Sawazki <sergej@taudac.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-12-21 18:09:19 -08:00
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2017-11-13 01:34:14 +01:00
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