powerpc/83xx: add DS1374 RTC support for the MPC837xE-MDS boards
The RTC is sitting on the I2C1 bus at address 0x68. RTC interrupt signal is connected to the IPIC's EXT3 interrupt line. Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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