From: Andrew Lunn <andrew@lunn.ch>
To: "Thomas Geßler" <gessler_t@brueckmann-gmbh.de>
Cc: Thomas Gessler <thomas.gessler@brueckmann-gmbh.de>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
MD Danish Anwar <danishanwar@ti.com>,
Ravi Gunasekaran <r-gunasekaran@ti.com>
Subject: Re: [PATCH 2/2] net: phy: dp83869: Fix RGMII-SGMII and 1000BASE-X
Date: Wed, 15 May 2024 17:10:51 +0200 [thread overview]
Message-ID: <7b951904-6193-45f1-8878-7bf3ecf83b74@lunn.ch> (raw)
In-Reply-To: <338669-229a-5eac-3170-3477e5ae840@brueckmann-gmbh.de>
On Wed, May 15, 2024 at 10:15:33AM +0200, Thomas Geßler wrote:
> On Tue, 14 May 2024, Andrew Lunn wrote:
> > On Tue, May 14, 2024 at 02:27:28PM +0200, Thomas Gessler wrote:
> > > The RGMII-to-SGMII mode is special, because the chip does not really act
> > > as a PHY in this mode but rather as a bridge.
> >
> > It is known as a media converter. You see them used between an RGMII
> > port and an SFP cage. Is that your use case?
>
> Basically. I would call this an RGMII-SGMII bridge. A "media converter" I
> would call a device that changes the physical medium, like 1000BASE-T
> copper/RJ45 to 1000BASE-X fiber/SFP.
>
> We have this chip on a daughter card with exposed SGMII lines that can be
> plugged into customer-specific motherboards. The motherboard will have
> either an SGMII-copper PHY (this can also be a DP83869) with 10/100/1000
> auto-neg enabled but without MDIO exposed to the CPU on the daughter card;
> or an SFP cage. The SFP module, in turn, can be for 1000BASE-X fiber,
> 1000BASE-X-to-1000-BASE-T copper, or SGMII copper supporting 10/100/1000
> auto-neg.
The SFP use case is probably not too hard to support. There are PHYs
drivers today which have the needed plumbing for this. Look at the
marvell10g driver, its mv3310_sfp_ops. qcom/qca807x.c: qca807x_sfp_ops
etc.
Andrew
next prev parent reply other threads:[~2024-05-15 15:11 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-14 12:27 [PATCH 1/2] net: phy: dp83869: Add PHY ID for chip revision 3 Thomas Gessler
2024-05-14 12:27 ` [PATCH 2/2] net: phy: dp83869: Fix RGMII-SGMII and 1000BASE-X Thomas Gessler
2024-05-14 12:56 ` Andrew Lunn
2024-05-15 8:15 ` Thomas Geßler
2024-05-15 15:10 ` Andrew Lunn [this message]
2024-05-14 13:05 ` Russell King (Oracle)
2024-05-15 8:45 ` Thomas Geßler
2024-05-14 13:08 ` Andrew Lunn
2024-05-15 7:47 ` Thomas Geßler
2024-05-14 12:47 ` [PATCH 1/2] net: phy: dp83869: Add PHY ID for chip revision 3 Andrew Lunn
2024-05-15 7:04 ` Thomas Geßler
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