linux-kernel - [PATCH v2 3/4] dt-bindings: net: mdio: add phy-id-read-needs-reset property

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Message-ID: <20251015134503.107925-3-buday.csaba@prolan.hu>
Date: Wed, 15 Oct 2025 15:45:02 +0200
From: Buday Csaba <buday.csaba@...lan.hu>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Florian Fainelli <f.fainelli@...il.com>,
	<netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Buday Csaba <buday.csaba@...lan.hu>
Subject: [PATCH v2 3/4] dt-bindings: net: mdio: add phy-id-read-needs-reset property

Some Ethernet PHYs require a hard reset before accessing their MDIO
registers. When the ID is not provided by a compatible string,
reading the PHY ID may fail on such devices.

This patch introduces a new device tree property called
`phy-id-read-needs-reset`, which can be used to hard reset the
PHY before attempting to read its ID via MDIO.

Signed-off-by: Buday Csaba <buday.csaba@...lan.hu>
---
 Documentation/devicetree/bindings/net/ethernet-phy.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 2ec2d9fda..b570f8038 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -215,6 +215,14 @@ properties:
       Delay after the reset was deasserted in microseconds. If
       this property is missing the delay will be skipped.
 
+  phy-id-read-needs-reset:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Some PHYs require a hard reset before accessing MDIO registers.
+      This workaround allows auto-detection of the PHY ID in such cases.
+      When the PHY ID is provided with the 'compatible' string, setting
+      this property has no effect.
+
   sfp:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
-- 
2.39.5