Re: [PATCH net-next 1/3] ptp: Add adjphase function to support phase offset control.

[Richard Cochran <richardcochran@xxxxxxxxx>]

On Wed, Apr 29, 2020 at 08:28:23PM -0400, vincent.cheng.xh@xxxxxxxxxxx wrote:
> diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
> index acabbe7..c46ff98 100644
> --- a/drivers/ptp/ptp_clock.c
> +++ b/drivers/ptp/ptp_clock.c
> @@ -146,6 +146,8 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
>  		else
>  			err = ops->adjfreq(ops, ppb);
>  		ptp->dialed_frequency = tx->freq;
> +	} else if (tx->modes & ADJ_OFFSET) {
> +		err = ops->adjphase(ops, tx->offset);

This is a new method, and no drivers have it, so there must be a check
that the function pointer is non-null.

Thanks,
Richard