linux-kernel - [RFC PATCH v3 net-next 10/10] docs: devicetree: add documentation for the VSC7512 SPI device

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Date:   Fri, 13 Aug 2021 19:50:03 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     colin.foster@...advantage.com, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        claudiu.manoil@....com, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, hkallweit1@...il.com,
        linux@...linux.org.uk
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH v3 net-next 10/10] docs: devicetree: add documentation for the VSC7512 SPI device

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 .../devicetree/bindings/net/dsa/ocelot.txt    | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/ocelot.txt b/Documentation/devicetree/bindings/net/dsa/ocelot.txt
index 7a271d070b72..edf560a50803 100644
--- a/Documentation/devicetree/bindings/net/dsa/ocelot.txt
+++ b/Documentation/devicetree/bindings/net/dsa/ocelot.txt
@@ -8,6 +8,7 @@ Currently the switches supported by the felix driver are:
 
 - VSC9959 (Felix)
 - VSC9953 (Seville)
+- VSC7511, VSC7512, VSC7513, VSC7514 via SPI
 
 The VSC9959 switch is found in the NXP LS1028A. It is a PCI device, part of the
 larger ENETC root complex. As a result, the ethernet-switch node is a sub-node
@@ -211,3 +212,94 @@ Example:
 		};
 	};
 };
+
+The VSC7513 and VSC7514 switches can be controlled internally via the MIPS
+processor. The VSC7511 and VSC7512 don't have this internal processor, but all
+four chips can be controlled externally through SPI with the following required
+properties:
+
+- compatible:
+	Can be "mscc,vsc7511", "mscc,vsc7512", "mscc,vsc7513", or
+	"mscc,vsc7514".
+
+Supported phy modes for all chips are:
+
+* phy_mode = "sgmii": on ports 0, 1, 2, 3
+
+The VSC7512 and 7514 also support:
+
+* phy_mode = "sgmii": on ports 4, 5, 6, 7
+* phy_mode = "qsgmii": on ports 7, 8, 10
+
+Example for control from a BeagleBone Black
+
+&spi0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	ethernet-switch@0 {
+		compatible = "mscc,vsc7512";
+		spi-max-frequency = <250000>;
+		reg = <0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				ethernet = <&mac>;
+				phy-mode = "sgmii";
+
+				fixed-link {
+					speed = <100>;
+					full-duplex;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+				label = "swp1";
+				phy-handle = <&sw_phy1>;
+				phy-mode = "sgmii";
+			};
+
+			port@2 {
+				reg = <2>;
+				label = "swp2";
+				phy-handle = <&sw_phy2>;
+				phy-mode = "sgmii";
+			};
+
+			port@3 {
+				reg = <3>;
+				label = "swp3";
+				phy-handle = <&sw_phy3>;
+				phy-mode = "sgmii";
+			};
+		};
+
+		mdio {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			sw_phy1: ethernet-phy@1 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x1>;
+			};
+
+			sw_phy2: ethernet-phy@2 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x2>;
+			};
+
+			sw_phy3: ethernet-phy@3 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x3>;
+			};
+		};
+	};
+};
-- 
2.25.1