gpio/pca953x: Deprecate meaningless device-tree bindings
The property 'polarity' is handled by the GPIO core, and the 'gpio-base' should be assigned automatically. It is meaningless in the device-tree, since GPIO's are identified by the "chip-name"/offset pair. This way, the whole pca953x_get_alt_pdata() can hopefully soon go away. We still need to check whether we really want GPIO-interrupt functionality by simply looking if the I2C node has an interrupts property defined, since this property is not used for anything else. Signed-off-by: NDavid Jander <david@protonic.nl> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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