[RFC PATCH 2/3] arm64: dts: ti: k3-j784s4: Add overlay to enable QSGMII mode with CPSW9G

[Siddharth Vadapalli]

The J7 Quad Port Add-On Ethernet Card for J784S4 EVM supports QSGMII
mode. Use the overlay to configure CPSW9G ports in QSGMII mode with the
Add-On Ethernet Card connected to the ENET Expansion 1 slot on the EVM.

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               |   2 +
 .../ti/k3-j784s4-evm-quad-port-eth-exp1.dtso  | 142 ++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-evm-quad-port-eth-exp1.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index c83c9d772b81..88c43f1f211b 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -46,6 +46,8 @@ dtb-$(CONFIG_ARCH_K3) += k3-j721s2-common-proc-board.dtb
 # Boards with J784s4 SoC
 dtb-$(CONFIG_ARCH_K3) += k3-am69-sk.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-quad-port-eth-exp1.dtbo
 
 # Enable support for device-tree overlays
 DTC_FLAGS_k3-am6548-iot2050-advanced-m2 += -@
+DTC_FLAGS_k3-j784s4-evm += -@
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm-quad-port-eth-exp1.dtso b/arch/arm64/boot/dts/ti/k3-j784s4-evm-quad-port-eth-exp1.dtso
new file mode 100644
index 000000000000..3c1e1b1d495c
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm-quad-port-eth-exp1.dtso
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * DT Overlay for CPSW9G in QSGMII mode using J7 Quad Port ETH EXP Add-On Ethernet Card with
+ * J7AHP board. The Add-On Ethernet Card has to be connected to ENET Expansion 1 slot on the
+ * 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/phy/phy-cadence.h>
+#include <dt-bindings/phy/phy.h>
+
+#include "k3-pinctrl.h"
+
+&{/} {
+	aliases {
+		ethernet1 = "/bus@100000/ethernet@c000000/ethernet-ports/port@5";
+		ethernet2 = "/bus@100000/ethernet@c000000/ethernet-ports/port@6";
+		ethernet3 = "/bus@100000/ethernet@c000000/ethernet-ports/port@7";
+		ethernet4 = "/bus@100000/ethernet@c000000/ethernet-ports/port@8";
+	};
+};
+
+&main_cpsw0 {
+	status = "okay";
+};
+
+&main_cpsw0_port5 {
+	status = "okay";
+	phy-handle = <&cpsw9g_phy1>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 5>, <&serdes2_qsgmii_link>;
+	phy-names = "mac", "serdes";
+};
+
+&main_cpsw0_port6 {
+	status = "okay";
+	phy-handle = <&cpsw9g_phy2>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 6>, <&serdes2_qsgmii_link>;
+	phy-names = "mac", "serdes";
+};
+
+&main_cpsw0_port7 {
+	status = "okay";
+	phy-handle = <&cpsw9g_phy0>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 7>, <&serdes2_qsgmii_link>;
+	phy-names = "mac", "serdes";
+};
+
+&main_cpsw0_port8 {
+	status = "okay";
+	phy-handle = <&cpsw9g_phy3>;
+	phy-mode = "qsgmii";
+	mac-address = [00 00 00 00 00 00];
+	phys = <&cpsw0_phy_gmii_sel 8>, <&serdes2_qsgmii_link>;
+	phy-names = "mac", "serdes";
+};
+
+&main_cpsw0_mdio {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio0_pins_default>;
+	bus_freq = <1000000>;
+	reset-gpios = <&exp2 17 GPIO_ACTIVE_LOW>;
+	reset-post-delay-us = <120000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	cpsw9g_phy0: ethernet-phy@16 {
+		reg = <16>;
+	};
+	cpsw9g_phy1: ethernet-phy@17 {
+		reg = <17>;
+	};
+	cpsw9g_phy2: ethernet-phy@18 {
+		reg = <18>;
+	};
+	cpsw9g_phy3: ethernet-phy@19 {
+		reg = <19>;
+	};
+};
+
+&exp2 {
+	/* Power-up ENET1 EXPANDER PHY. */
+	qsgmii-line-hog {
+		gpio-hog;
+		gpios = <16 GPIO_ACTIVE_HIGH>;
+		output-low;
+	};
+	/* Toggle MUX2 for MDIO lines */
+	mux-sel-hog {
+		gpio-hog;
+		gpios = <13 GPIO_ACTIVE_HIGH>, <14 GPIO_ACTIVE_HIGH>, <15 GPIO_ACTIVE_HIGH>;
+		output-high;
+	};
+};
+
+&main_pmx0 {
+	mdio0_pins_default: mdio0-pins-default {
+		pinctrl-single,pins = <
+			J784S4_IOPAD(0x05c, PIN_INPUT, 4) /* (AC36) MCASP2_AXR0.MDIO1_MDIO */
+			J784S4_IOPAD(0x058, PIN_INPUT, 4) /* (AE37) MCASP2_AFSX.MDIO1_MDC */
+		>;
+	};
+};
+
+&serdes_ln_ctrl {
+	idle-states = <J784S4_SERDES0_LANE0_PCIE1_LANE0>, <J784S4_SERDES0_LANE1_PCIE1_LANE1>,
+		      <J784S4_SERDES0_LANE2_IP3_UNUSED>, <J784S4_SERDES0_LANE3_USB>,
+		      <J784S4_SERDES1_LANE0_PCIE0_LANE0>, <J784S4_SERDES1_LANE1_PCIE0_LANE1>,
+		      <J784S4_SERDES1_LANE2_PCIE0_LANE2>, <J784S4_SERDES1_LANE3_PCIE0_LANE3>,
+		      <J784S4_SERDES2_LANE0_QSGMII_LANE5>, <J784S4_SERDES2_LANE1_QSGMII_LANE6>,
+		      <J784S4_SERDES2_LANE2_QSGMII_LANE7>, <J784S4_SERDES2_LANE3_QSGMII_LANE8>;
+};
+
+&serdes_wiz2 {
+	status = "okay";
+};
+
+&serdes2 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	serdes2_qsgmii_link: phy@0 {
+		reg = <2>;
+		cdns,num-lanes = <1>;
+		#phy-cells = <0>;
+		cdns,phy-type = <PHY_TYPE_QSGMII>;
+		resets = <&serdes_wiz2 3>;
+	};
+};
-- 
2.25.1