linux-kernel - Re: [PATCH net-next v2 1/2] ptp: introduce PTP_CLOCK_EXTOFF event for the measured external offset

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Message-ID: <20231130170506.GG32077@kernel.org>
Date:   Thu, 30 Nov 2023 17:05:06 +0000
From:   Simon Horman <horms@...nel.org>
To:     Min Li <lnimi@...mail.com>
Cc:     richardcochran@...il.com, lee@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Min Li <min.li.xe@...esas.com>
Subject: Re: [PATCH net-next v2 1/2] ptp: introduce PTP_CLOCK_EXTOFF event
 for the measured external offset

On Wed, Nov 29, 2023 at 03:48:05PM -0500, Min Li wrote:
> From: Min Li <min.li.xe@...esas.com>
> 
> This change is for the PHC devices that can measure the phase offset
> between PHC signal and the external signal, such as the 1PPS signal of
> GNSS. Reporting PTP_CLOCK_EXTOFF to user space will be piggy-backed to
> the existing ptp_extts_event so that application such as ts2phc can
> poll the external offset the same way as extts. Hence, ts2phc can use
> the offset to achieve the alignment between PHC and the external signal
> by the help of either SW or HW filters.
> 
> Signed-off-by: Min Li <min.li.xe@...esas.com>

...

> @@ -228,7 +230,10 @@ struct ptp_pin_desc {
>  #define PTP_MASK_EN_SINGLE  _IOW(PTP_CLK_MAGIC, 20, unsigned int)
>  
>  struct ptp_extts_event {
> -	struct ptp_clock_time t; /* Time event occured. */
> +	union {
> +		struct ptp_clock_time t; /* Time event occured. */
> +		__s64 offset_ns;         /* Offset event occured */
> +	};

Hi Min Li,

if you end up respinning this patch, please consider correcting
the spelling of occurred.

>  	unsigned int index;      /* Which channel produced the event. */
>  	unsigned int flags;      /* Reserved for future use. */
>  	unsigned int rsv[2];     /* Reserved for future use. */
> -- 
> 2.39.2
>