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 <osose.itua@savoirfairelinux.com>
---
.../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: