From: Oleksij Rempel <o.rempel@pengutronix.de>
To: Andrew Lunn <andrew@lunn.ch>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>, Dan Murphy <dmurphy@ti.com>,
kernel@pengutronix.de, David Jander <david@protonic.nl>,
Jakub Kicinski <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: [PATCH net-next v1 1/1] net: phy: dp83td510: Add basic support for the DP83TD510 Ethernet PHY
Date: Mon, 26 Jul 2021 14:18:51 +0200 [thread overview]
Message-ID: <20210726121851.u3flif2opshwgz5e@pengutronix.de> (raw)
In-Reply-To: <YPsGddTXtk/Hinmp@lunn.ch>
Hi Andrew,
On Fri, Jul 23, 2021 at 08:12:05PM +0200, Andrew Lunn wrote:
> On Fri, Jul 23, 2021 at 07:08:49PM +0200, Oleksij Rempel wrote:
> > Hi Andrew,
> >
> > On Fri, Jul 23, 2021 at 03:22:16PM +0200, Andrew Lunn wrote:
> > > On Fri, Jul 23, 2021 at 12:42:18PM +0200, Oleksij Rempel wrote:
> > > > The DP83TD510E is an ultra-low power Ethernet physical layer transceiver
> > > > that supports 10M single pair cable.
> > > >
> > > > This driver provides basic support for this chip:
> > > > - link status
> > > > - autoneg can be turned off
> > > > - master/slave can be configured to be able to work without autoneg
> > > >
> > > > This driver and PHY was tested with ASIX AX88772B USB Ethernet controller.
> > >
> > > Hi Oleksij
> > >
> > > There were patches flying around recently for another T1L PHY which
> > > added new link modes. Please could you work together with that patch
> > > to set the phydev features correctly to indicate this PHY is also a
> > > T1L, and if it support 2.4v etc.
> >
> > ACK, thx. I was not able to spend enough time to investigate all needed
> > caps, so I decided to go mainline with limited functionality first.
>
> Limited functionality is fine, but what is implemented should be
> correct. And from what i see in the patch, it is hard to know if the
> PHYs basic features are correctly determined. What does ethtool show?
> Is 100BaseT being offered? Half duplex?
With current driver ethtool with show this information:
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: Not reported
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 10Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: unknown
master-slave status: unknown
Port: Twisted Pair
PHYAD: 1
Transceiver: external
MDI-X: Unknown
Supports Wake-on: pg
Wake-on: p
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
> > voltage depends on the end application: cable length, safety requirements. I do
> > not see how this can be chosen only on auto negotiation. We would need proper
> > user space interface to let user/integrator set the limits.
>
> I think we are talking at cross purposes here. As far as i understand
> T1L supports the data signals to be 2.4Vpp as well as the usual
> 1Vpp. This is something which can be negotiated in the same way as
> master/slave, duplex etc.
>
> I suspect you are talking about the PoE aspects. That is outside the
> scope for phylib. PoE in general is not really supported in the Linux
> kernel, and probably needs a subsystem of its own.
No, no. I'm talking about data signals configuration (2.4Vpp/1Vpp), which
depends on application and cable length. 1Vpp should not be used with
cable over 200 meter and 2.4Vpp should not be used on safety critical
applications.
Regards,
Oleksij
--
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Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
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next prev parent reply other threads:[~2021-07-26 12:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-23 10:42 [PATCH net-next v1 1/1] net: phy: dp83td510: Add basic support for the DP83TD510 Ethernet PHY Oleksij Rempel
2021-07-23 13:22 ` Andrew Lunn
2021-07-23 17:08 ` Oleksij Rempel
2021-07-23 18:12 ` Andrew Lunn
2021-07-26 12:18 ` Oleksij Rempel [this message]
2021-07-26 13:23 ` Andrew Lunn
2021-07-27 6:51 ` Oleksij Rempel
2021-07-24 0:56 ` kernel test robot
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