i2c: mux: inform the i2c mux core about how it is used
The i2c mux core can then take appropriate action depending on if it is used for an actual i2c mux, for a gate or for an arbitrator (the last is the case for these drivers). This adds support for the new clearer and more compact devicetree bindings that was added recently. Reviewed-by: NWolfram Sang <wsa@the-dreams.de> Signed-off-by: NPeter Rosin <peda@axentia.se>
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