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| author | Andrew Lunn <andrew@lunn.ch> | 2020-04-20 00:04:01 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-04-20 12:37:08 -0700 |
| commit | 3e782985cb3ce00a32c372b37d8feefdae18ddf1 (patch) | |
| tree | 038d45cc6e884a2a5929546f6cd200f62a5c37c3 /Documentation | |
| parent | 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef (diff) | |
| download | linux-3e782985cb3ce00a32c372b37d8feefdae18ddf1.tar.bz2 | |
net: ethernet: fec: Allow configuration of MDIO bus speed
MDIO busses typically operate at 2.5MHz. However many devices can
operate at faster speeds. This then allows more MDIO transactions per
second, useful for Ethernet switch statistics, or Ethernet PHY TDR
data. Allow the bus speed to be configured, using the standard
"clock-frequency" property, which i2c busses use to indicate the bus
speed. Before using this property, ensure all devices on the bus do
actually support the requested clock speed.
Suggested-by: Chris Healy <Chris.Healy@zii.aero>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/net/fsl-fec.txt | 1 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/net/mdio.yaml | 6 |
2 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt index ff8b0f211aa1..26c492a2e0e1 100644 --- a/Documentation/devicetree/bindings/net/fsl-fec.txt +++ b/Documentation/devicetree/bindings/net/fsl-fec.txt @@ -82,6 +82,7 @@ ethernet@83fec000 { phy-supply = <®_fec_supply>; phy-handle = <ðphy>; mdio { + clock-frequency = <5000000>; ethphy: ethernet-phy@6 { compatible = "ethernet-phy-ieee802.3-c22"; reg = <6>; diff --git a/Documentation/devicetree/bindings/net/mdio.yaml b/Documentation/devicetree/bindings/net/mdio.yaml index 50c3397a82bc..ab4a9df8b8e2 100644 --- a/Documentation/devicetree/bindings/net/mdio.yaml +++ b/Documentation/devicetree/bindings/net/mdio.yaml @@ -39,6 +39,12 @@ properties: and must therefore be appropriately determined based on all PHY requirements (maximum value of all per-PHY RESET pulse widths). + clock-frequency: + description: + Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3 + defined 2.5MHz should only be used when all devices on the bus support + the given clock speed. + patternProperties: "^ethernet-phy@[0-9a-f]+$": type: object |