linux-kernel - Re: [PATCHv2 next 1/3] ptp: add ptp

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Message-ID: <ZRwjPegND0V4jF6U@kernel.org>
Date:   Tue, 3 Oct 2023 16:20:45 +0200
From:   Simon Horman <horms@...nel.org>
To:     Mahesh Bandewar <maheshb@...gle.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Linux <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        John Stultz <jstultz@...gle.com>,
        Don Hatchett <hatch@...gle.com>,
        Yuliang Li <yuliangli@...gle.com>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCHv2 next 1/3] ptp: add ptp_gettimex64any() support

On Mon, Oct 02, 2023 at 09:17:01PM -0700, Mahesh Bandewar wrote:
> add support for TS sandwich of the user preferred timebase. The options
> supported are PTP_TS_REAL (CLOCK_REALTIME), PTP_TS_MONO (CLOCK_MONOTONIC),
> and PTP_TS_RAW (CLOCK_MONOTONIC_RAW)
> 
> Option of PTP_TS_REAL is equivalent of using ptp_gettimex64().
> 
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> CC: Richard Cochran <richardcochran@...il.com>
> CC: "David S. Miller" <davem@...emloft.net>
> CC: netdev@...r.kernel.org
> ---
>  include/linux/ptp_clock_kernel.h | 51 ++++++++++++++++++++++++++++++++
>  include/uapi/linux/ptp_clock.h   |  7 +++++
>  2 files changed, 58 insertions(+)
> 
> diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
> index 1ef4e0f9bd2a..fd7be98e7bba 100644
> --- a/include/linux/ptp_clock_kernel.h
> +++ b/include/linux/ptp_clock_kernel.h
> @@ -102,6 +102,15 @@ struct ptp_system_timestamp {
>   *               reading the lowest bits of the PHC timestamp and the second
>   *               reading immediately follows that.
>   *
> + * @gettimex64any:  Reads the current time from the hardware clock and
> +                 optionally also any of the MONO, MONO_RAW, or SYS clock.

nit: I think a '*' is needed on the line above.

> + *               parameter ts: Holds the PHC timestamp.
> + *               parameter sts: If not NULL, it holds a pair of timestamps from
> + *               the clock of choice. The first reading is made right before
> + *               reading the lowest bits of the PHC timestamp and the second
> + *               reading immediately follows that.
> + *               parameter type: any one of the TS opt from ptp_timestamp_types.
> + *
>   * @getcrosststamp:  Reads the current time from the hardware clock and
>   *                   system clock simultaneously.
>   *                   parameter cts: Contains timestamp (device,system) pair,

...