linux-kernel - Re: [PATCH v2 4/7] net: dsa: b53: Add PHC clock support

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Message-ID: <a546e219-607c-1705-e366-7281e1aeedde@gmail.com>
Date:   Tue, 9 Nov 2021 10:08:44 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Martin Kaistra <martin.kaistra@...utronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Cc:     Richard Cochran <richardcochran@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 4/7] net: dsa: b53: Add PHC clock support

On 11/9/21 1:50 AM, Martin Kaistra wrote:
> The BCM53128 switch has an internal clock, which can be used for
> timestamping. Add support for it.
> 
> The 32-bit free running clock counts nanoseconds. In order to account
> for the wrap-around at 999999999 (0x3B9AC9FF) while using the cycle
> counter infrastructure, we need to set a 30bit mask and use the
> overflow_point property.
> 
> Enable the Broadsync HD timestamping feature in b53_ptp_init() for PTPv2
> Ethertype (0x88f7).
> 
> Signed-off-by: Martin Kaistra <martin.kaistra@...utronix.de>
> ---

[snip]

>  struct b53_mib_desc {
>  	u8 size;
> @@ -1131,12 +1132,24 @@ static int b53_setup(struct dsa_switch *ds)
>  			b53_disable_port(ds, port);
>  	}
>  
> +	if (dev->broadsync_hd) {
> +		ret = b53_ptp_init(dev);
> +		if (ret) {
> +			dev_err(ds->dev, "failed to initialize PTP\n");
> +			return ret;
> +		}

Can you fold the check for dev->broadsync_hd within b53_ptp_init() as
requested before? And likewise for b53_ptp_exit.
-- 
Florian