clearfog-cx: add support for serdes 1 protocol 18 with runtime 10G/25G

With Serdes 1 Protocol 18 and some changes to mc-utils and linux,
Clearfog-CX can switch any ethernet port between 10 and 25Gbps speed.

SFP connectors switch automatically according to SFP module properties,
QSFP ports are configured in device-tree.

patches/linux/0024-arm64-dts-lx2160a-clearfog-itx-set-fixed-link-for-qs.patch

@@ -0,0 +1,119 @@
+From 8e334669fa98d99e21f7c17a3d6bbbd48878a2b2 Mon Sep 17 00:00:00 2001
+From: Josua Mayer <[email protected]>
+Date: Thu, 31 Oct 2024 17:14:25 +0100
+Subject: [PATCH 24/25] arm64: dts: lx2160a-clearfog-itx: set fixed link for
+ qsfp ports
+
+As QSFP is not currenly supported in the Linux kernel no attempt is made
+to model this detail of Honeycomb and Clearfog-CX boards.
+
+Vendor bootloader used to set up the ethernet ports which are routed to
+qsfp connector as fixed links in MC firmware depending on selected
+serdes protocol.
+These firmware side fixed links worked on linux side without any
+explicit configuration.
+
+The LX2160A also supports runtime configuration of network protocols on
+ethernet ports and serdes lanes using generic phys. This requires
+changing the interface type on firmware side to type "PHY".
+
+The standard SFP ports on Honeycomb / Clearfog-CX already rely on
+interface type "PHY" to report link and switch ethernet protocol at
+runtime based on SFP module properties.
+
+When interface type is on firmware side is "PHY", dpaa2 driver
+configures ethernet ports based on runtime information such as SFP
+modules properties and reported link status, or a dedicated phy on mdio
+bus.
+
+In lack of actual QSFP support set up the affected ethernet ports for
+fixed 10Gbps link, and enable their respective pcs nodes.
+This ensures that when firmware set interface type "PHY", the port and
+serdes lanes are configured properly to allow TX and RX of packets.
+
+It also simplifies configuration for users by allowing selection of
+interface speed (e.g. 10 or 25Gbps with serdes 1 protocol 18) in
+device-tree rather than firmware.
+
+Signed-off-by: Josua Mayer <[email protected]>
+---
+ .../freescale/fsl-lx2160a-clearfog-itx.dtsi   | 56 +++++++++++++++++++
+ 1 file changed, 56 insertions(+)
+
+diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi
+index f43d6a90e162..11a99d4efe93 100644
+--- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi
++++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi
+@@ -60,6 +60,46 @@ sfp3: sfp-3 {
+ 	};
+ };
+
++&dpmac3 {
++	phys = <&serdes_1 7>;
++	phy-connection-type = "10gbase-r";
++
++	fixed-link {
++	      speed = <10000>;
++	      full-duplex;
++	};
++};
++
++&dpmac4 {
++	phys = <&serdes_1 6>;
++	phy-connection-type = "10gbase-r";
++
++	fixed-link {
++	      speed = <10000>;
++	      full-duplex;
++	};
++};
++
++&dpmac5 {
++	phys = <&serdes_1 5>;
++	phy-connection-type = "10gbase-r";
++
++	fixed-link {
++	      speed = <10000>;
++	      full-duplex;
++	};
++};
++
++&dpmac6 {
++	phys = <&serdes_1 4>;
++	phy-connection-type = "10gbase-r";
++
++	fixed-link {
++	      speed = <10000>;
++	      full-duplex;
++	};
++};
++
+ &dpmac7 {
+ 	sfp = <&sfp0>;
+ 	managed = "in-band-status";
+@@ -104,6 +144,22 @@ &pcie5 {
+ 	status = "okay";
+ };
+
++&pcs_mdio3 {
++	status = "okay";
++};
++
++&pcs_mdio4 {
++	status = "okay";
++};
++
++&pcs_mdio5 {
++	status = "okay";
++};
++
++&pcs_mdio6 {
++	status = "okay";
++};
++
+ &pcs_mdio7 {
+ 	status = "okay";
+ };
+-- 
+2.43.0
+

patches/linux/0025-arm64-dts-lx2160a-clearfog-cx-add-description-for-re.patch

@@ -0,0 +1,83 @@
+From 678cee596a136c8dd9d91ce62ae9702cb3da82b1 Mon Sep 17 00:00:00 2001
+From: Josua Mayer <[email protected]>
+Date: Thu, 31 Oct 2024 15:46:16 +0100
+Subject: [PATCH 25/25] arm64: dts: lx2160a-clearfog-cx: add description for
+ retimers
+
+SolidRun Clearfog-CX (unlike Honeycomb) has QSFP connector driven by
+retimers to support long copper wires.
+
+Add descriptions for both retimers and link them to the relevant
+ethernet interfaces.
+
+Retimers were added with board revision 1.3, earlier baords can use the
+honeycomb dts.
+
+Signed-off-by: Josua Mayer <[email protected]>
+---
+ .../boot/dts/freescale/fsl-lx2160a-cex7.dtsi  |  2 +-
+ .../dts/freescale/fsl-lx2160a-clearfog-cx.dts | 38 +++++++++++++++++++
+ 2 files changed, 39 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi b/arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi
+index 024a119bcb7a..503e346f4d86 100644
+--- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi
++++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi
+@@ -155,7 +155,7 @@ regulator@5c {
+ 			};
+ 		};
+
+-		i2c@3 {
++		i2c_smb: i2c@3 {
+ 			#address-cells = <1>;
+ 			#size-cells = <0>;
+ 			reg = <3>;
+diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-cx.dts b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-cx.dts
+index 86a9b771428d..60151fccd198 100644
+--- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-cx.dts
++++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-cx.dts
+@@ -13,3 +13,41 @@ / {
+ 	compatible = "solidrun,clearfog-cx",
+ 		"solidrun,lx2160a-cex7", "fsl,lx2160a";
+ };
++
++&dpmac3 {
++	phys = <&serdes_1 7>, <&retimer0 3>, <&retimer1 3>;
++	phy-names = "serdes", "retimer", "retimer";
++};
++
++&dpmac4 {
++	phys = <&serdes_1 6>, <&retimer0 2>, <&retimer1 2>;
++	phy-names = "serdes", "retimer", "retimer";
++};
++
++&dpmac5 {
++	phys = <&serdes_1 5>, <&retimer0 1>, <&retimer1 1>;
++	phy-names = "serdes", "retimer", "retimer";
++};
++
++&dpmac6 {
++	phys = <&serdes_1 4>, <&retimer0 0>, <&retimer1 0>;
++	phy-names = "serdes", "retimer", "retimer";
++};
++
++&i2c_smb {
++	status = "okay";
++
++	/* tx direction */
++	retimer0: retimer@22 {
++		compatible = "ti,ds250df410";
++		reg = <0x22>;
++		#phy-cells = <1>;
++	};
++
++	/* rx direction */
++	retimer1: retimer@23 {
++		compatible = "ti,ds250df410";
++		reg = <0x23>;
++		#phy-cells = <1>;
++	};
++};
+-- 
+2.43.0
+

patches/mc-utils/0005-lx2160acex7-clearfog-cx-configure-qsfp-ports-type-ph.patch

@@ -0,0 +1,52 @@
+From 35dffd4f4a82a18897bf0b78df8f1402ef5e2d03 Mon Sep 17 00:00:00 2001
+From: Josua Mayer <[email protected]>
+Date: Thu, 31 Oct 2024 17:35:21 +0100
+Subject: [PATCH] lx2160acex7: clearfog-cx: configure qsfp ports type phy
+
+Interface type PHY allows Linux to configure ethernet speed at runtime
+for each port, rather than sticking to assignment from serdes protocols.
+
+This is particularly useful with SD1 protocol 18 which by default drives
+just two ports at 25Gbps while QSFP connector has 4.
+At protocol 18 Linux can switch any of the 8 ports between 10Gbps and
+25Gbps as needed.
+
+Due to lack of software support, the QSFP ports need to define speed in
+device-tree.
+
+Signed-off-by: Josua Mayer <[email protected]>
+---
+ config/lx2160a/LX2160A-CEX7/clearfog-cx-s1_8-s2_0-dpc.dts | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/config/lx2160a/LX2160A-CEX7/clearfog-cx-s1_8-s2_0-dpc.dts b/config/lx2160a/LX2160A-CEX7/clearfog-cx-s1_8-s2_0-dpc.dts
+index dcc376e..9a508d2 100644
+--- a/config/lx2160a/LX2160A-CEX7/clearfog-cx-s1_8-s2_0-dpc.dts
++++ b/config/lx2160a/LX2160A-CEX7/clearfog-cx-s1_8-s2_0-dpc.dts
+@@ -69,19 +69,19 @@
+ 	board_info {
+ 		ports {
+ 			mac@3 {
+-				link_type = "MAC_LINK_TYPE_FIXED";
++				link_type = "MAC_LINK_TYPE_PHY";
+ 			};
+
+ 			mac@4 {
+-				link_type = "MAC_LINK_TYPE_FIXED";
++				link_type = "MAC_LINK_TYPE_PHY";
+ 			};
+
+ 			mac@5 {
+-				link_type = "MAC_LINK_TYPE_FIXED";
++				link_type = "MAC_LINK_TYPE_PHY";
+ 			};
+
+ 			mac@6 {
+-				link_type = "MAC_LINK_TYPE_FIXED";
++				link_type = "MAC_LINK_TYPE_PHY";
+ 			};
+
+ 			mac@7 {
+-- 
+2.43.0
+