i2c: imx: use clk notifier for rate changes
Instead of repeatedly calling clk_get_rate for each transfer, register a clock notifier to update the cached divider value each time the clock rate actually changes. Signed-off-by: NLucas Stach <l.stach@pengutronix.de> Reviewed-by: NPhilipp Zabel <p.zabel@pengutronix.de> Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
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