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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: Corentin Guillevic , Woojung Huh , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] dt-bindings: net: dsa: microchip: add bit-banged SMI example Date: Mon, 2 Jun 2025 19:04:57 +0200 Message-ID: <20250602170458.125549-1-corentin.guillevic@smile.fr> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- Changes in v2: - Fix dt_binding_check errors .../bindings/net/dsa/microchip,ksz.yaml | 59 ++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml b= /Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml index 62ca63e8a26f..33a067809ebe 100644 --- a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml +++ b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml @@ -241,4 +241,61 @@ examples: }; }; }; -... + + # KSZ8863 with bit-banged SMI + - | + #include + + // Ethernet switch connected via SMI to the host, CPU port wired to et= h0: + ethernet0 { + phy-mode =3D "rmii"; + + fixed-link { + speed =3D <100>; + full-duplex; + pause; + }; + }; + + mdio: mdio { + #address-cells =3D <1>; + #size-cells =3D <0>; + compatible =3D "microchip,mdio-smi0"; + gpios =3D <&gpioc 1 GPIO_ACTIVE_HIGH>, + <&gpioa 2 GPIO_ACTIVE_HIGH>; + status =3D "okay"; + + switch@0 { + compatible =3D "microchip,ksz8863"; + reg =3D <0>; + reset-gpios =3D <&gpioa 4 GPIO_ACTIVE_LOW>; + status =3D "okay"; + + ethernet-ports { + #address-cells =3D <1>; + #size-cells =3D <0>; + lan1: port@0 { + reg =3D <0>; + label =3D "lan1"; + phy-mode =3D "internal"; + }; + lan2: port@1 { + reg =3D <1>; + label =3D "lan2"; + phy-mode =3D "internal"; + }; + port@2 { + reg =3D <2>; + label =3D "cpu"; + ethernet =3D <ðernet0>; + phy-mode =3D "rmii"; + microchip,rmii-clk-internal; + + fixed-link { + speed =3D <100>; + full-duplex; + }; + }; + }; + }; + }; --=20 2.49.0