> +#define IDM_CTRL_DIRECT_OFFSET       0x00

And this IDM thing is also never used outside of the I2C context? In
other words, it also doesn't need a seperate DT node?


> +	/* indicates no slave mode support */
> +	bool no_slave;

I would suggest to not use a flag, but to nullify the {un}reg_slave
callbacks in probe depending on the type. That will also tell the
i2c-core that slave functionality is not supported. And you can use if
(!algo->reg_slave) as a flag, too.

> +	iproc_i2c->type =
> +		(enum bcm_iproc_i2c_type) of_device_get_match_data(&pdev->dev);

No need to cast a void*.