linux-kernel - [PATCH] dt-bindings: net: dsa: microchip: add bit-banged SMI example

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Message-ID: <20250528203152.628818-1-corentin.guillevic@smile.fr>
Date: Wed, 28 May 2025 22:31:51 +0200
From: Corentin Guillevic <corentin.guillevic@...le.fr>
To: Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"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>,
	Marek Vasut <marex@...x.de>
Cc: Corentin Guillevic <corentin.guillevic@...le.fr>,
	Woojung Huh <Woojung.Huh@...rochip.com>,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: net: dsa: microchip: add bit-banged SMI example

KSZ8863 can be configured using I2C, SPI or Microchip SMI. The latter is
similar to MDIO, but uses a different protocol. If the hardware doesn't
support this, SMI bit banging can help. This commit adds an device tree
example that uses the CONFIG_MDIO_GPIO driver for SMI bit banging.

Signed-off-by: Corentin Guillevic <corentin.guillevic@...le.fr>
---
 .../bindings/net/dsa/microchip,ksz.yaml       | 57 +++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
index 62ca63e8a26f..6cab0100065b 100644
--- a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
@@ -242,3 +242,60 @@ examples:
         };
     };
 ...
+  # KSZ8863 with bit-banged SMI
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    // Ethernet switch connected via SMI to the host, CPU port wired to eth0:
+    ethernet0 {
+        phy-mode = "rmii";
+
+        fixed-link {
+            speed = <100>;
+            full-duplex;
+            pause;
+        };
+    };
+
+    mdio: mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "microchip,mdio-smi0";
+        gpios = <&gpioc 1 GPIO_ACTIVE_HIGH>,
+            <&gpioa 2 GPIO_ACTIVE_HIGH>;
+        status = "okay";
+
+        switch@0 {
+            compatible = "microchip,ksz8863";
+            reg = <0>;
+            reset-gpios = <&gpioa 4 GPIO_ACTIVE_LOW>;
+            status = "okay";
+
+            ethernet-ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                lan1: port@0 {
+                    reg = <0>;
+                    label = "lan1";
+                    phy-mode = "internal";
+                };
+                lan2: port@1 {
+                    reg = <1>;
+                    label = "lan2";
+                    phy-mode = "internal";
+                };
+                port@2 {
+                    reg = <2>;
+                    label = "cpu";
+                    ethernet = <&ethernet0>;
+                    phy-mode = "rmii";
+                    microchip,rmii-clk-internal;
+
+                    fixed-link {
+                        speed = <100>;
+                        full-duplex;
+                    };
+                };
+            };
+        };
+   };
-- 
2.49.0