linux-kernel - [PATCH 3/3] dt-bindings: ethernet-phy: add optional mii-lite-mode flag

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Message-ID: <20250620134430.1849344-4-kamilh@axis.com>
Date: Fri, 20 Jun 2025 15:44:30 +0200
From: Kamil Horák (2N) <kamilh@...s.com>
To: <florian.fainelli@...adcom.com>, <bcm-kernel-feedback-list@...adcom.com>,
	<andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <kamilh@...s.com>, <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <robh@...nel.org>
Subject: [PATCH 3/3] dt-bindings: ethernet-phy: add optional mii-lite-mode flag

The Broadcom bcm54810 and bcm54811 PHYs support MII and MII-Lite
interface modes. The MII-Lite mode does not use TXR, RXER, CRS and COL
signals. However, the hardware strapping only selects MII mode,
distinction between MII and MII-Lite must be done by software.

Add optional mii-lite-mode flag to switch the PHY to MII-Lite mode.

Signed-off-by: Kamil Horák (2N) <kamilh@...s.com>
---
 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 71e2cd32580f..edfd16044770 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -101,6 +101,14 @@ properties:
       1BR-10 names. The PHY must be configured to operate in BroadR-Reach mode
       by software.
 
+  mii-lite-mode:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If set, indicates the use of MII-Lite variant of MII, without the
+      functions of TXER, RXER, CRS and COL signals for Broadcom PHYs. These
+      PHYs can be strapped to use MII mode but the MII or MII-Lite selection
+      must be done by software.
+
   clocks:
     maxItems: 1
     description:
-- 
2.39.5