linux-kernel - [net-next PATCH 2/2] dt-bindings: net: Document support for Aeonsemi PHYs

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Message-ID: <20250323225439.32400-2-ansuelsmth@gmail.com>
Date: Sun, 23 Mar 2025 23:54:27 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Christian Marangi <ansuelsmth@...il.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"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>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [net-next PATCH 2/2] dt-bindings: net: Document support for Aeonsemi PHYs

Document support for Aeonsemi PHYs and the requirement of a firmware to
correctly work. Also document the max number of LEDs supported and what
PHY ID expose when no firmware is loaded.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 .../bindings/net/aeonsemi,as21xxx.yaml        | 87 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 88 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml

diff --git a/Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml b/Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml
new file mode 100644
index 000000000000..0549abcd3929
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/aeonsemi,as21xxx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aeonsemi AS21XXX Ethernet PHY
+
+maintainers:
+  - Christian Marangi <ansuelsmth@...il.com>
+
+description: |
+  Aeonsemi AS21xxx Ethernet PHYs requires a firmware to be loaded to actually
+  work. The same firmware is compatible with various PHYs of the same family.
+
+  A PHY with not firmware loaded will be exposed on the MDIO bus with ID
+  0x7500 0x7500
+
+  This can be done and is implemented by OEM in 2 different way:
+    - Attached SPI flash directly to the PHY with the firmware. The PHY
+      will self load the firmware in the presence of this configuration.
+    - Manually provided firmware loaded from a file in the filesystem.
+
+  Each PHY can support up to 5 LEDs.
+
+allOf:
+  - $ref: ethernet-phy.yaml#
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - ethernet-phy-id7500.7500
+  required:
+    - compatible
+
+properties:
+  reg:
+    maxItems: 1
+
+  firmware-name:
+    description: specify the name of PHY firmware to load
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet-phy@1f {
+            compatible = "ethernet-phy-id7500.7500",
+                         "ethernet-phy-ieee802.3-c45";
+
+            reg = <31>;
+            firmware-name = "as21x1x_fw.bin";
+
+            leds {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                led@0 {
+                    reg = <0>;
+                    color = <LED_COLOR_ID_GREEN>;
+                    function = LED_FUNCTION_LAN;
+                    function-enumerator = <0>;
+                    default-state = "keep";
+                };
+
+                led@1 {
+                    reg = <1>;
+                    color = <LED_COLOR_ID_GREEN>;
+                    function = LED_FUNCTION_LAN;
+                    function-enumerator = <1>;
+                    default-state = "keep";
+                };
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 9a2df6d221bd..59a863dd3b70 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -649,6 +649,7 @@ AEONSEMI PHY DRIVER
 M:	Christian Marangi <ansuelsmth@...il.com>
 L:	netdev@...r.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml
 F:	drivers/net/phy/as21xxx.c
 
 AF8133J THREE-AXIS MAGNETOMETER DRIVER
-- 
2.48.1