diff options
| author | Kamil Horák - 2N <kamilh@axis.com> | 2025-07-08 11:01:37 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-07-09 19:32:30 -0700 |
| commit | 67c0170566b55b1f6ee3567c94ff679104277e2d (patch) | |
| tree | 10e7db8077758d6c7e7c5ea08a243b7122b1b427 /Documentation/networking | |
| parent | 6dfcbd7d1d657994a57b53ad4be834eb783f32bc (diff) | |
net: phy: MII-Lite PHY interface mode
Some Broadcom PHYs are capable to operate in simplified MII mode,
without TXER, RXER, CRS and COL signals as defined for the MII.
The MII-Lite mode can be used on most Ethernet controllers with full
MII interface by just leaving the input signals (RXER, CRS, COL)
inactive. The absence of COL signal makes half-duplex link modes
impossible but does not interfere with BroadR-Reach link modes on
Broadcom PHYs, because they are all full-duplex only.
Add MII-Lite interface mode, especially for Broadcom two-wire PHYs.
Signed-off-by: Kamil Horák - 2N <kamilh@axis.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20250708090140.61355-2-kamilh@axis.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/phy.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst index f64641417c54..7f159043ad5a 100644 --- a/Documentation/networking/phy.rst +++ b/Documentation/networking/phy.rst @@ -333,6 +333,13 @@ Some of the interface modes are described below: SerDes lane, each port having speeds of 2.5G / 1G / 100M / 10M achieved through symbol replication. The PCS expects the standard USXGMII code word. +``PHY_INTERFACE_MODE_MIILITE`` + Non-standard, simplified MII mode, without TXER, RXER, CRS and COL signals + as defined for the MII. The absence of COL signal makes half-duplex link + modes impossible but does not interfere with BroadR-Reach link modes on + Broadcom (and other two-wire Ethernet) PHYs, because they are full-duplex + only. + Pause frames / flow control =========================== |