On Fri, Aug 16, 2019 at 03:44:41AM +0300, Vladimir Oltean wrote:

> @@ -842,6 +843,9 @@ struct spi_transfer {
>  
>  	u32		effective_speed_hz;
>  
> +	struct ptp_system_timestamp *ptp_sts;
> +	unsigned int	ptp_sts_word_offset;
> +

You've not documented these fields at all so it's not clear what the
intended usage is.