[PATCH v2] riscv: dts: spacemit: k3: Add USB2.0 support

[Yixun Lan]

There is one USB2.0 host in K3 SoC which use DWC3 IP but only provide
USB2.0 functionality, and with only one USB2 PHY connected.

The USB2.0 controller on Pico-ITX board connects to a Terminus FE1.1 Hub
which fully USB2.0 protocol compliant and provides 4 ports.

Signed-off-by: Yixun Lan <dlan at kernel.org>
---
This series adds devicetree support to enable USB2.0 in Pico-ITX board, 
There is a run-time dependency on USB phy[1], Hub[2] and reset[3] patches,
but each series should be quite independent.

For people who interested, I've collected all patches and put a complete
branch here[4].

Currently, the USB phy[1] patch is still waiting for maintainer to
merge.

Link: https://lore.kernel.org/r/20260305-11-k3-usb2-phy-v4-0-15554fb933bc@kernel.org [1]
Link: https://lore.kernel.org/r/20260317-03-usb-hub-fe1-v1-0-71ec3989f5be@kernel.org [2]
Link: https://lore.kernel.org/r/20260314-01-k3-reset-usb-pci-v2-1-9dc0976d524e@kernel.org [3]
Link: https://github.com/spacemit-com/linux/tree/WIP/k3/usb2 [4]
---
Changes in v2:
- separate DT patch out, no code changes
- Link to v1: https://lore.kernel.org/r/20260317-02-k3-usb20-support-v1-0-d89f59062ad4@kernel.org
---
 arch/riscv/boot/dts/spacemit/k3-pico-itx.dts | 24 +++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k3.dtsi         | 31 ++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
index 4486dc1fe114..b89c1521e664 100644
--- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
+++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
@@ -26,6 +26,14 @@ memory at 100000000 {
 		reg = <0x1 0x00000000 0x4 0x00000000>;
 	};
 
+	reg_aux_vcc3v3: regulator-aux-vcc3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "AUX_VCC3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
 	reg_aux_vcc5v: regulator-aux-vcc5v {
 		compatible = "regulator-fixed";
 		regulator-name = "AUX_VCC5V";
@@ -197,3 +205,19 @@ &uart0 {
 	pinctrl-0 = <&uart0_0_cfg>;
 	status = "okay";
 };
+
+&usb2_host {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	hub at 1 {
+		compatible = "usb1a40,0101";
+		reg = <1>;
+		vdd-supply = <&reg_aux_vcc3v3>;
+	};
+};
+
+&usb2_phy {
+	status = "okay";
+};
diff --git a/arch/riscv/boot/dts/spacemit/k3.dtsi b/arch/riscv/boot/dts/spacemit/k3.dtsi
index 815debd16409..9eb2ff07218a 100644
--- a/arch/riscv/boot/dts/spacemit/k3.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k3.dtsi
@@ -438,6 +438,37 @@ soc: soc {
 		dma-noncoherent;
 		ranges;
 
+		usb2_host: usb at c0a00000 {
+			compatible = "spacemit,k3-dwc3";
+			reg = <0x0 0xc0a00000 0x0 0x10000>;
+			clocks = <&syscon_apmu CLK_APMU_USB2_BUS>;
+			clock-names = "usbdrd30";
+			resets = <&syscon_apmu RESET_APMU_USB2_AHB>,
+				 <&syscon_apmu RESET_APMU_USB2_VCC>,
+				 <&syscon_apmu RESET_APMU_USB2_PHY>;
+			reset-names = "ahb", "vcc", "phy";
+			interrupts = <105 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-parent = <&saplic>;
+			phys = <&usb2_phy>;
+			phy-names = "usb2-phy";
+			phy_type = "utmi";
+			snps,dis_enblslpm_quirk;
+			snps,dis_u2_susphy_quirk;
+			snps,dis-del-phy-power-chg-quirk;
+			snps,dis-tx-ipgap-linecheck-quirk;
+			dr_mode = "host";
+			maximum-speed = "high-speed";
+			status = "disabled";
+		};
+
+		usb2_phy: phy at c0a20000 {
+			compatible = "spacemit,k3-usb2-phy";
+			reg = <0x0 0xc0a20000 0x0 0x200>;
+			clocks = <&syscon_apmu CLK_APMU_USB2_BUS>;
+			#phy-cells = <0>;
+			status = "disabled";
+		};
+
 		eth0: ethernet at cac80000 {
 			compatible = "spacemit,k3-dwmac", "snps,dwmac-5.40a";
 			reg = <0x0 0xcac80000 0x0 0x2000>;

---
base-commit: af62a095eb0c3359d477b55ef72d2afd94c83c8f
change-id: 20260330-02-k3-usb20-dts-670aeb20e2d3

Best regards,
-- 
Yixun Lan <dlan at kernel.org>