Messages in this thread | | | Date | Sat, 30 Jul 2022 05:55:17 +0200 | From | Andrew Lunn <> | Subject | Re: [PATCH net-next v3 1/4] net: phy: Introduce QUSGMII PHY mode |
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On Fri, Jul 29, 2022 at 05:33:53PM +0200, Maxime Chevallier wrote: > The QUSGMII mode is a derivative of Cisco's USXGMII standard. This > standard is pretty similar to SGMII, but allows for faster speeds, and > has the build-in bits for Quad and Octa variants (like QSGMII). > > The main difference with SGMII/QSGMII is that USXGMII/QUSGMII re-uses > the preamble to carry various information, named 'Extensions'. > > As of today, the USXGMII standard only mentions the "PCH" extension, > which is used to convey timestamps, allowing in-band signaling of PTP > timestamps without having to modify the frame itself. > > This commit adds support for that mode. When no extension is in use, it > behaves exactly like QSGMII, although it's not compatible with QSGMII. > > Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
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