linux-kernel - [PATCH 1/3] dt-bindings: net: cdns,macb: Add external REFCLK property

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Message-ID: <7f9c7308e404a6bcebdc8cc65ccf188dde435924.1750346271.git.Ryan.Wanner@microchip.com>
Date: Thu, 19 Jun 2025 10:04:13 -0700
From: <Ryan.Wanner@...rochip.com>
To: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<claudiu.beznea@...on.dev>
CC: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Ryan Wanner <Ryan.Wanner@...rochip.com>
Subject: [PATCH 1/3] dt-bindings: net: cdns,macb: Add external REFCLK property

From: Ryan Wanner <Ryan.Wanner@...rochip.com>

REFCLK can be provided by an external source so this should be exposed
by a DT property. The REFCLK is used for RMII and in some SoCs that use
this driver the RGMII 125MHz clk can also be provided by an external
source.

Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
---
 Documentation/devicetree/bindings/net/cdns,macb.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/cdns,macb.yaml b/Documentation/devicetree/bindings/net/cdns,macb.yaml
index 8d69846b2e09..e69f60c37793 100644
--- a/Documentation/devicetree/bindings/net/cdns,macb.yaml
+++ b/Documentation/devicetree/bindings/net/cdns,macb.yaml
@@ -114,6 +114,13 @@ properties:
   power-domains:
     maxItems: 1
 
+  cdns,refclk-ext:
+    type: boolean
+    description:
+      This selects if the REFCLK for RMII is provided by an external source.
+      For RGMII mode this selects if the 125MHz REF clock is provided by an external
+      source.
+
   cdns,rx-watermark:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-- 
2.43.0