This is the first round of GPIO fixes for v4.3: - Return value checks and thus nicer errorpath for two drivers. - Make GPIO_RCAR arch neutral. - Propagate errors from GPIO chip ->get() vtable call. It turned out these can actually fail sometimes, especially on slowpath controllers doing I2C traffic and similar. - Update documentation to be in sync with the massive changes in the v4.3 merge window, phew. - Handle deferred probe properly in the OMAP driver. - Get rid of surplus MODULE_ALIAS() from sx150x.