linux-kernel - [PATCH 4/4] ARM: dts: NSP: Move USB3 PHY to internal MDIO bus

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Message-Id: <20210613094639.3242151-4-mnhagan88@gmail.com>
Date:   Sun, 13 Jun 2021 10:46:37 +0100
From:   Matthew Hagan <mnhagan88@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivek Unune <npcomplete13@...il.com>,
        Matthew Hagan <mnhagan88@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] ARM: dts: NSP: Move USB3 PHY to internal MDIO bus

This patch largely replicates Vivek Unune's patch "ARM: dts:
BCM5301X:Make usb3 phy use mdio phy driver"[1] for the NSP platform,
whereby we need to create an mdio-mux to facilitate switches
configured via external MDIO, in this case on the Meraki MX65.

However in doing so, we are creating an overlap with usb3_phy's
ccb-mii range. To resolve this, usb3_phy should be moved to a child
node of the internal MDIO bus. The result is heavily based upon Vivek's
patch. This has also been cross-referenced with Yendapally Reddy's
earlier work which utilised the subsequently dropped brcm,nsp-usb3-phy
driver: "[PATCH v2 4/4] arm: dts: nsp: Add USB nodes to device tree"
[2]. Finally, this change provides conformance to the bcm-ns-usb3-phy
documentation, utilising the required usb3-dmp-syscon property. Note
that support for the deprecated ccb-mii bindings has been dropped as of
"phy: phy-bcm-ns-usb3: drop support for deprecated DT binding"[3].

[1] https://lore.kernel.org/patchwork/patch/933971/
[2] https://www.spinics.net/lists/arm-kernel/msg555132.html
[3] https://lore.kernel.org/linux-devicetree/20201113113423.9466-1-zajec5@gmail.com/

Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
---
 arch/arm/boot/dts/bcm-nsp.dtsi | 38 +++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-nsp.dtsi b/arch/arm/boot/dts/bcm-nsp.dtsi
index e91a68996986..7c59816fdb32 100644
--- a/arch/arm/boot/dts/bcm-nsp.dtsi
+++ b/arch/arm/boot/dts/bcm-nsp.dtsi
@@ -370,6 +370,35 @@ mdio: mdio@...00 {
 			#address-cells = <1>;
 		};
 
+		mdio-mux@...00 {
+			compatible = "mdio-mux-mmioreg";
+			reg = <0x32000 0x4>;
+			mux-mask = <0x200>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			mdio-parent-bus = <&mdio>;
+
+			mdio_int: mdio@0 {
+				reg = <0x0>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				usb3_phy: usb3-phy@10 {
+					compatible = "brcm,ns-bx-usb3-phy";
+					reg = <0x10>;
+					usb3-dmp-syscon = <&usb3_dmp>;
+					#phy-cells = <0>;
+					status = "disabled";
+				};
+			};
+
+			mdio_ext: mdio@200 {
+				reg = <0x200>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
+		};
+
 		rng: rng@...00 {
 			compatible = "brcm,bcm-nsp-rng";
 			reg = <0x33000 0x14>;
@@ -530,13 +559,8 @@ sata1: sata-port@1 {
 			};
 		};
 
-		usb3_phy: usb3-phy@...000 {
-			compatible = "brcm,ns-bx-usb3-phy";
-			reg = <0x104000 0x1000>,
-			      <0x032000 0x1000>;
-			reg-names = "dmp", "ccb-mii";
-			#phy-cells = <0>;
-			status = "disabled";
+		usb3_dmp: syscon@...000 {
+			reg = <0x104000 0x1000>;
 		};
 	};
 
-- 
2.26.3