linux-kernel - Re: [PATCH net 1/3] broadcom: fix support for PTP_PEROUT_DUTY

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Message-ID: <dbfe6e10-f7f1-4a79-abc1-37151235bc5c@linux.dev>
Date: Fri, 19 Sep 2025 12:02:02 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Jacob Keller <jacob.e.keller@...el.com>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Kory Maincent <kory.maincent@...tlin.com>
Cc: Richard Cochran <richardcochran@...il.com>,
 Yaroslav Kolomiiets <yrk@...a.com>, James Clark <jjc@...ark.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/3] broadcom: fix support for PTP_PEROUT_DUTY_CYCLE

On 19/09/2025 01:33, Jacob Keller wrote:
> The bcm_ptp_perout_locked() function has support for handling
> PTP_PEROUT_DUTY_CYCLE, but its not listed in the supported_perout_flags.
> Attempts to use the duty cycle support will be rejected since commit
> d9f3e9ecc456 ("net: ptp: introduce .supported_perout_flags to
> ptp_clock_info"), as this flag accidentally missed while doing the
> conversion.
> 
> Drop the unnecessary supported flags check from the bcm_ptp_perout_locked()
> function and correctly set the supported_perout_flags. This fixes use of
> the PTP_PEROUT_DUTY_CYCLE support for the broadcom driver.
> 
> Reported-by: James Clark <jjc@...ark.com>
> Fixes: d9f3e9ecc456 ("net: ptp: introduce .supported_perout_flags to ptp_clock_info")
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> ---
>   drivers/net/phy/bcm-phy-ptp.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/net/phy/bcm-phy-ptp.c b/drivers/net/phy/bcm-phy-ptp.c
> index eba8b5fb1365..1cf695ac73cc 100644
> --- a/drivers/net/phy/bcm-phy-ptp.c
> +++ b/drivers/net/phy/bcm-phy-ptp.c
> @@ -597,10 +597,6 @@ static int bcm_ptp_perout_locked(struct bcm_ptp_private *priv,
>   
>   	period = BCM_MAX_PERIOD_8NS;	/* write nonzero value */
>   
> -	/* Reject unsupported flags */
> -	if (req->flags & ~PTP_PEROUT_DUTY_CYCLE)
> -		return -EOPNOTSUPP;
> -
>   	if (req->flags & PTP_PEROUT_DUTY_CYCLE)
>   		pulse = ktime_to_ns(ktime_set(req->on.sec, req->on.nsec));
>   	else
> @@ -741,6 +737,7 @@ static const struct ptp_clock_info bcm_ptp_clock_info = {
>   	.n_pins		= 1,
>   	.n_per_out	= 1,
>   	.n_ext_ts	= 1,
> +	.supported_perout_flags = PTP_PEROUT_DUTY_CYCLE,
>   };
>   
>   static void bcm_ptp_txtstamp(struct mii_timestamper *mii_ts,
> 

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>