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| author | Stas Sergeev <stsp@list.ru> | 2015-07-20 17:49:57 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-10-27 09:33:12 -0400 |
| commit | 71a386c7a6a1cf88c712f39e9e60fead672846c5 (patch) | |
| tree | e1dfd0ca93d43afd054286dd97af21b812dbfd86 /Documentation | |
| parent | c0fb099370bcd7dd1956a787efbec35584d00117 (diff) | |
of_mdio: add new DT property 'managed' to specify the PHY management type
[ Upstream commit 4cba5c2103657d43d0886e4cff8004d95a3d0def ]
Currently the PHY management type is selected by the MAC driver arbitrary.
The decision is based on the presence of the "fixed-link" node and on a
will of the driver's authors.
This caused a regression recently, when mvneta driver suddenly started
to use the in-band status for auto-negotiation on fixed links.
It appears the auto-negotiation may not work when expected by the MAC driver.
Sebastien Rannou explains:
<< Yes, I confirm that my HW does not generate an in-band status. AFAIK, it's
a PHY that aggregates 4xSGMIIs to 1xQSGMII ; the MAC side of the PHY (with
inband status) is connected to the switch through QSGMII, and in this context
we are on the media side of the PHY. >>
https://lkml.org/lkml/2015/7/10/206
This patch introduces the new string property 'managed' that allows
the user to set the management type explicitly.
The supported values are:
"auto" - default. Uses either MDIO or nothing, depending on the presence
of the fixed-link node
"in-band-status" - use in-band status
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>
CC: Rob Herring <robh+dt@kernel.org>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Florian Fainelli <f.fainelli@gmail.com>
CC: Grant Likely <grant.likely@linaro.org>
CC: devicetree@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/net/ethernet.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/ethernet.txt b/Documentation/devicetree/bindings/net/ethernet.txt index 3fc360523bc9..cb115a3b7e00 100644 --- a/Documentation/devicetree/bindings/net/ethernet.txt +++ b/Documentation/devicetree/bindings/net/ethernet.txt @@ -19,7 +19,11 @@ The following properties are common to the Ethernet controllers: - phy: the same as "phy-handle" property, not recommended for new bindings. - phy-device: the same as "phy-handle" property, not recommended for new bindings. +- managed: string, specifies the PHY management type. Supported values are: + "auto", "in-band-status". "auto" is the default, it usess MDIO for + management if fixed-link is not specified. Child nodes of the Ethernet controller are typically the individual PHY devices connected via the MDIO bus (sometimes the MDIO bus controller is separate). They are described in the phy.txt file in this same directory. +For non-MDIO PHY management see fixed-link.txt. |