linux-kernel - Re: [PATCH net v2 2/2] net: micrel: Fix set/get PHC time for lan8814

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Date: Fri, 19 Jan 2024 09:21:03 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Andrew Lunn <andrew@...n.ch>
CC: <hkallweit1@...il.com>, <linux@...linux.org.uk>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<richardcochran@...il.com>, <Divya.Koppera@...rochip.com>,
	<maxime.chevallier@...tlin.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net v2 2/2] net: micrel: Fix set/get PHC time for lan8814

The 01/18/2024 18:00, Andrew Lunn wrote:
> 
> > > Maybe submit this for net-next?
> >
> > Anyway, I don't have strong feelings about this, if it goes to net or
> > net-next, I just want to fix this at some point :)
> 
> Please submit to net-next. I think the ML bot which picks out patches
> to backport is likely to see the work Fix in the subject and decided
> to backport it anyway. But its not our problem if the bot breaks the
> stable rules.

Yes, I will do that.

> 
> Is there any danger of regressions? Could the higher word actually
> have a value for some reason today, which is being ignored. Would this
> change then jump the time forward?

I am not seeing any danger of regressions.
By default the higher word has a value of 0, and doesn't have any
special functionality to jump forward or backwards. It just contains
upper 16 bits of the second [47:32].
I have seen only on register PTP_LTC_STEP_ADJ_HI that the most significant
bit can signify if to jump forward or backwards.

> 
>        Andrew

-- 
/Horatiu