i2c: fsi: Add transfer implementation
Execute I2C transfers from the FSI-attached I2C master. Use polling instead of interrupts as we have no hardware IRQ over FSI. Signed-off-by: NEddie James <eajames@linux.vnet.ibm.com> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com> Tested-by: NJoel Stanley <joel@jms.id.au> Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
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