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overlays: Add 'combine' option to i2c overlays
The i2c0-bcm2708 and i2c1-bcm2708 overlays allow the I2C pin usage to be changed. The names also suggest they revert to the old i2c_bcm2708 driver, but they don't. The newer i2c_bcm2835 driver forces transactions to be combined where possible, but this breaks some devices. Add an option to disable transaction combining, which is currently implemented by reverting to the old driver. See: raspberrypi/firmware#828 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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