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

[Richard Cochran]

On Wed, Apr 29, 2020 at 08:28:23PM -0400, vincent.cheng...@renesas.com 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