netdev - Re: [PATCH] ptp: ocp: don't allow on S390

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Date:   Mon, 16 Aug 2021 14:15:51 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     netdev@...r.kernel.org, Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH] ptp: ocp: don't allow on S390

On 8/16/21 2:09 PM, Jonathan Lemon wrote:
> On Fri, Aug 13, 2021 at 01:30:26PM -0700, Randy Dunlap wrote:
>> There is no 8250 serial on S390. See commit 1598e38c0770.
> 
> There's a 8250 serial device on the PCI card.   Its been
> ages since I've worked on the architecture, but does S390
> even support PCI?

Yes, it does.

>> Is this driver useful even without 8250 serial?
> 
> The FB timecard has an FPGA that will internally parse the
> GNSS strings and correct the clock, so the PTP clock will
> work even without the serial devices.
> 
> However, there are userspace tools which want to read the
> GNSS signal (for holdolver and leap second indication),
> which is why they are exposed.

So what do you recommend here?

thanks.
-- 
~Randy