Hi!

> +static void __reg_io_start(const struct upboard_ddata * const ddata)
> +{
> +	/*
> +	 * CLEAR signal must be pulsed low before any register access.
> +	 * This resets internal counters in the controller and marks
> +	 * the start of a new register access.
> +	 */
> +	set_clear(ddata, 0);
> +	set_clear(ddata, 1);
> +}

We normally reserve __ prefix for different stuff. This is not using
it appropriately.
								Pavel

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