[PATCH 2/2] arm64: dts: ti: k3-j721e: Add overlay to enable CPSW9G ports in QSGMII mode

[Siddharth Vadapalli]

The J7 Quad Port Add-On Ethernet Card for J721E Common-Proc-Board supports
QSGMII mode. Use the overlay to configure CPSW9G ports in QSGMII mode.

Add support to reset the PHY from kernel by using gpio-hog and gpio-reset.

Add aliases for CPSW9G ports to enable kernel to fetch MAC addresses
directly from U-Boot.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
---
 arch/arm64/boot/dts/ti/Makefile               |   4 +
 .../dts/ti/k3-j721e-quad-port-eth-exp.dtso    | 148 ++++++++++++++++++
 2 files changed, 152 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j721e-quad-port-eth-exp.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 6acd12409d59..167bcd9b09b7 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -45,3 +45,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
 
 # Enable support for device-tree overlays
 DTC_FLAGS_k3-am6548-iot2050-advanced-m2 += -@
+DTC_FLAGS_k3-j721e-common-proc-board += -@
+
+# Device-tree overlays
+dtb-$(CONFIG_ARCH_K3) += k3-j721e-quad-port-eth-exp.dtbo
diff --git a/arch/arm64/boot/dts/ti/k3-j721e-quad-port-eth-exp.dtso b/arch/arm64/boot/dts/ti/k3-j721e-quad-port-eth-exp.dtso
new file mode 100644
index 000000000000..c63e1454614e
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j721e-quad-port-eth-exp.dtso
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * DT Overlay for CPSW9G in QSGMII mode using J7 Quad Port ETH EXP Add-On Ethernet Card with
+ * J721E board.
+ *
+ * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/mux/ti-serdes.h>
+#include <dt-bindings/pinctrl/k3.h>
+#include <dt-bindings/phy/phy.h>
+#include <dt-bindings/phy/phy-cadence.h>
+
+/ {
+	fragment@102 {
+		target-path = "/";
+		__overlay__ {
+			aliases {
+				ethernet1 = "/bus@100000/ethernet@c000000/ethernet-ports/port@1";
+				ethernet2 = "/bus@100000/ethernet@c000000/ethernet-ports/port@2";
+				ethernet3 = "/bus@100000/ethernet@c000000/ethernet-ports/port@3";
+				ethernet4 = "/bus@100000/ethernet@c000000/ethernet-ports/port@4";
+			};
+		};
+	};
+};
+
+&cpsw0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio_pins_default>;
+};
+
+&cpsw0_port1 {
+	phy-handle = <&cpsw9g_phy0>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 1>;
+};
+
+&cpsw0_port2 {
+	phy-handle = <&cpsw9g_phy1>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 2>;
+};
+
+&cpsw0_port3 {
+	phy-handle = <&cpsw9g_phy2>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 3>;
+};
+
+&cpsw0_port4 {
+	phy-handle = <&cpsw9g_phy3>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 4>;
+};
+
+&cpsw0_port5 {
+	status = "disabled";
+};
+
+&cpsw0_port6 {
+	status = "disabled";
+};
+
+&cpsw0_port7 {
+	status = "disabled";
+};
+
+&cpsw0_port8 {
+	status = "disabled";
+};
+
+&cpsw9g_mdio {
+	reset-gpios = <&exp2 17 GPIO_ACTIVE_LOW>;
+	reset-post-delay-us = <120000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	cpsw9g_phy0: ethernet-phy@17 {
+		reg = <17>;
+	};
+	cpsw9g_phy1: ethernet-phy@16 {
+		reg = <16>;
+	};
+	cpsw9g_phy2: ethernet-phy@18 {
+		reg = <18>;
+	};
+	cpsw9g_phy3: ethernet-phy@19 {
+		reg = <19>;
+	};
+};
+
+&exp2 {
+	qsgmii-line-hog {
+		gpio-hog;
+		gpios = <16 GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "qsgmii-pwrdn-line";
+	};
+};
+
+&main_pmx0 {
+	mdio_pins_default: mdio_pins_default {
+		pinctrl-single,pins = <
+			J721E_IOPAD(0x1bc, PIN_OUTPUT, 0) /* (V24) MDIO0_MDC */
+			J721E_IOPAD(0x1b8, PIN_INPUT, 0) /* (V26) MDIO0_MDIO */
+		>;
+	};
+};
+
+&serdes_ln_ctrl {
+	idle-states = <J721E_SERDES0_LANE0_PCIE0_LANE0>, <J721E_SERDES0_LANE1_QSGMII_LANE2>,
+		      <J721E_SERDES1_LANE0_PCIE1_LANE0>, <J721E_SERDES1_LANE1_PCIE1_LANE1>,
+		      <J721E_SERDES2_LANE0_PCIE2_LANE0>, <J721E_SERDES2_LANE1_PCIE2_LANE1>,
+		      <J721E_SERDES3_LANE0_USB3_0_SWAP>, <J721E_SERDES3_LANE1_USB3_0>,
+		      <J721E_SERDES4_LANE0_EDP_LANE0>, <J721E_SERDES4_LANE1_EDP_LANE1>,
+		      <J721E_SERDES4_LANE2_EDP_LANE2>, <J721E_SERDES4_LANE3_EDP_LANE3>;
+};
+
+&serdes_wiz0 {
+	status = "okay";
+};
+
+&serdes0 {
+	status = "okay";
+
+	assigned-clocks = <&serdes0 CDNS_SIERRA_PLL_CMNLC>, <&serdes0 CDNS_SIERRA_PLL_CMNLC1>;
+	assigned-clock-parents = <&wiz0_pll1_refclk>, <&wiz0_pll1_refclk>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	serdes0_qsgmii_link: phy@1 {
+		reg = <1>;
+		cdns,num-lanes = <1>;
+		#phy-cells = <0>;
+		cdns,phy-type = <PHY_TYPE_QSGMII>;
+		resets = <&serdes_wiz0 2>;
+	};
+};
-- 
2.25.1