i2c: add generic routine to parse DT for timing information
Inspired from the i2c-rk3x driver (thanks guys!) but refactored and extended. See built-in docs for further information. Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: NMika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
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