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dt-bindings: net: ethernet-phy: add property mac-termination-ohms

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Add property mac-termination-ohms in the device tree bindings for selecting
the resistance value of the builtin series termination resistors of the
PHY. Changing the resistance to an appropriate value can reduce signal
reflections and therefore improve signal quality.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250416-dp83822-mac-impedance-v3-1-028ac426cddb@liebherr.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dimitri Fedrau
2025-04-16 19:14:47 +02:00
committed by Jakub Kicinski
parent b7ed5d5a78
commit 4cb6316d33
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/net/ethernet-phy.yaml
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@@ -238,6 +238,16 @@ properties:
peak-to-peak specified in ANSI X3.263. When omitted, the PHYs default
will be left as is.
mac-termination-ohms:
maximum: 200
description:
The xMII signals need series termination on the driver side to match both
the output driver impedance and the line characteristic impedance, to
prevent reflections and EMI problems. Select a resistance value which is
supported by the builtin resistors of the PHY, otherwise the resistors may
have to be placed on board. When omitted, the PHYs default will be left as
is.
leds:
type: object