linux-kernel - [net-next RFC PATCH v5 4/4] dt-bindings: Document bindings for Marvell Aquantia PHY

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Message-Id: <20231106165433.2746-4-ansuelsmth@gmail.com>
Date:   Mon,  6 Nov 2023 17:54:33 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        Robert Marko <robimarko@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [net-next RFC PATCH v5 4/4] dt-bindings: Document bindings for Marvell Aquantia PHY

Document bindings for Marvell Aquantia PHY.

The Marvell Aquantia PHY require a firmware to work correctly and there
at least 3 way to load this firmware.

Describe all the different way and document the binding "firmware-name"
to load the PHY firmware from userspace.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
Changes v5:
- Drop extra entry not related to HW description
Changes v3:
- Make DT description more OS agnostic
- Use custom select to fix dtbs checks
Changes v2:
- Add DT patch

 .../bindings/net/marvell,aquantia.yaml        | 123 ++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/marvell,aquantia.yaml

diff --git a/Documentation/devicetree/bindings/net/marvell,aquantia.yaml b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
new file mode 100644
index 000000000000..7106c5bdf73c
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/marvell,aquantia.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell Aquantia Ethernet PHY
+
+maintainers:
+  - Christian Marangi <ansuelsmth@...il.com>
+
+description: |
+  Marvell Aquantia Ethernet PHY require a firmware to be loaded to actually
+  work.
+
+  This can be done and is implemented by OEM in 3 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.
+    - Dedicated partition on system NAND with firmware in it. NVMEM
+      subsystem will be used and the declared NVMEM cell will load
+      the firmware to the PHY using the PHY mailbox interface.
+    - Manually provided firmware loaded from a file in the filesystem.
+
+allOf:
+  - $ref: ethernet-phy.yaml#
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - ethernet-phy-id03a1.b445
+          - ethernet-phy-id03a1.b460
+          - ethernet-phy-id03a1.b4a2
+          - ethernet-phy-id03a1.b4d0
+          - ethernet-phy-id03a1.b4e0
+          - ethernet-phy-id03a1.b5c2
+          - ethernet-phy-id03a1.b4b0
+          - ethernet-phy-id03a1.b662
+          - ethernet-phy-id03a1.b712
+          - ethernet-phy-id31c3.1c12
+  required:
+    - compatible
+
+properties:
+  reg:
+    maxItems: 1
+
+  firmware-name:
+    description: specify the name of PHY firmware to load
+
+  nvmem-cells:
+    description: phandle to the firmware nvmem cell
+    maxItems: 1
+
+  nvmem-cell-names:
+    const: firmware
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet-phy@0 {
+            /*  Only needed to make DT lint tools work. Do not copy/paste
+             *  into real DTS files.
+             */
+            compatible = "ethernet-phy-id31c3.1c12",
+                         "ethernet-phy-ieee802.3-c45";
+
+            reg = <0>;
+            firmware-name = "AQR-G4_v5.4.C-AQR_CIG_WF-1945_0x8_ID44776_VER1630.cld";
+        };
+
+        ethernet-phy@1 {
+            /*  Only needed to make DT lint tools work. Do not copy/paste
+             *  into real DTS files.
+             */
+            compatible = "ethernet-phy-id31c3.1c12",
+                         "ethernet-phy-ieee802.3-c45";
+
+            reg = <0>;
+            nvmem-cells = <&aqr_fw>;
+            nvmem-cell-names = "firmware";
+        };
+    };
+
+    flash {
+        compatible = "jedec,spi-nor";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        partitions {
+            compatible = "fixed-partitions";
+            #address-cells = <1>;
+            #size-cells = <1>;
+
+            /* ... */
+
+            partition@...000 {
+                compatible = "nvmem-cells";
+                label = "0:ethphyfw";
+                reg = <0x650000 0x80000>;
+                read-only;
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                aqr_fw: aqr_fw@0 {
+                    reg = <0x0 0x5f42a>;
+                };
+            };
+
+            /* ... */
+
+        };
+    };
-- 
2.40.1