netdev - Re: [PATCH net-next v6 3/3] net: phy: Add support for 1PPS out and external timestamps

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Message-ID: <F8F52C51-9E03-4E05-AB56-809C37C2BF58@gmail.com>
Date:   Wed, 08 Jun 2022 13:58:45 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     netdev@...r.kernel.org, kernel-team@...com,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Lasse Johnsen <l@...johnsen.me>,
        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>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH net-next v6 3/3] net: phy: Add support for 1PPS out and external timestamps

On 8 Jun 2022, at 13:50, Richard Cochran wrote:

> On Wed, Jun 08, 2022 at 01:44:51PM -0700, Jonathan Lemon wrote:
>> The perout function is used to generate a 1PPS signal, synchronized
>> to the PHC.  This is accomplished by a using the hardware oneshot
>> functionality, which is reset by a timer.
>
> Is this now really in sync with the PHC?
>
> (previously there was talk about it being random phase/frequency)

Yes - I removed that function.

In the current code, the target time is loaded into the registers,
and the hw generates an output when the PHC matches the target.
—
Jonathan