[PATCH v3 1/2] dt-bindings: net: adi,adin: document LP Termination property
From: Osose Itua <hidden>
Date: 2026-01-07 22:29:34
Also in:
lkml, netdev
Subsystem:
analog devices inc adin driver, networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Michael Hennerich, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add "adi,low-cmode-impedance" boolean property which, when present, configures the PHY for the lowest common-mode impedance on the receive pair for 100BASE-TX operation by clearing the B_100_ZPTM_EN_DIMRX bit. This is suited for capacitive coupled applications and other applications where there may be a path for high common-mode noise to reach the PHY. If this value is not present, the value of the bit by default is 1, which is normal termination (zero-power termination) mode. Signed-off-by: Osose Itua <redacted> --- .../devicetree/bindings/net/adi,adin.yaml | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
index c425a9f1886d..f594055c2b15 100644
--- a/Documentation/devicetree/bindings/net/adi,adin.yaml
+++ b/Documentation/devicetree/bindings/net/adi,adin.yaml@@ -52,6 +52,20 @@ properties: description: Enable 25MHz reference clock output on CLK25_REF pin. type: boolean + adi,low-cmode-impedance: + description: | + Configure PHY for the lowest common-mode impedance on the receive pair + for 100BASE-TX. This is suited for capacitive coupled applications and + other applications where there may be a path for high common-mode noise + to reach the PHY. + If not present, by default the PHY is configured for normal termination + (zero-power termination) mode. + + Note: There is a trade-off of 12 mW increased power consumption with + the lowest common-mode impedance setting, but in all cases the + differential impedance is 100 ohms. + type: boolean + unevaluatedProperties: false examples: