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Date:   Thu, 18 Jun 2020 09:19:55 +0200
From:   Antoine Tenart <>
To:     Jakub Kicinski <>
Subject: Re: [PATCH net-next v2 6/8] net: phy: mscc: timestamping and PHC support

Hello Jakub,

Quoting Jakub Kicinski (2020-06-17 18:32:17)
> On Wed, 17 Jun 2020 15:31:25 +0200 Antoine Tenart wrote:
> > This patch adds support for PHC and timestamping operations for the MSCC
> > PHY. PTP 1-step and 2-step modes are supported, over Ethernet and UDP.
> > 
> > To get and set the PHC time, a GPIO has to be used and changes are only
> > retrieved or committed when on a rising edge. The same GPIO is shared by
> > all PHYs, so the granularity of the lock protecting it has to be
> > different from the ones protecting the 1588 registers (the VSC8584 PHY
> > has 2 1588 blocks, and a single load/save pin).
> > 
> > Co-developed-by: Quentin Schulz <>
> > Signed-off-by: Quentin Schulz <>
> > Signed-off-by: Antoine Tenart <>
> drivers/net/phy/mscc/mscc_ptp.c:406:24: warning: restricted __be16 degrades to integer
> drivers/net/phy/mscc/mscc_ptp.c:407:24: warning: restricted __be16 degrades to integer
> drivers/net/phy/mscc/mscc_ptp.c:1213:23: warning: symbol 'vsc85xx_clk_caps' was not declared. Should it be static?
> Please make sure you don't add warnings when built with W=1 C=1 flags.

I'll look into that.


Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering

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