[PATCH] riscv: dts: spacemit: k3: add USB3 port A (DRD) nodes

[Troy Mitchell]

Hi Chunyan,

On Fri Oct 30, 2026 at 5:40 PM +0800, Chunyan Zhang wrote:
> Describe the DWC3 controller and its USB 2.0 PHY for USB3 port A
> of the K3 SoC.
>
> Only the U2 lane is described: Port A's SuperSpeed PHY has no driver
> yet, so the port runs at high-speed (maximum-speed = "high-speed").
>
> Enable USB3 port A with dr_mode = "peripheral", so it can be used as
> a USB device.

Port A is a Type-C port behind a FUSB301, so please note in the commit
message that it's device-only until the CC controller is described.

Was this tested with a C-to-C cable? That depends on the FUSB301's
power-on CC mode, since nothing configures it yet.

>
> Signed-off-by: Chunyan Zhang <chunyan.zhang at linux.spacemit.com>
> ---
>  arch/riscv/boot/dts/spacemit/k3-pico-itx.dts |  9 ++++++
>  arch/riscv/boot/dts/spacemit/k3.dtsi         | 30 ++++++++++++++++++++
>  2 files changed, 39 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> index b084a35aa00e..74d4fdf9e405 100644

Please rebase onto spacemit for-next, which already has Aurelien's
USB3 phy rework.

> --- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> +++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> @@ -323,6 +323,15 @@ &usb2_phy {
>  	status = "okay";
>  };
>  
> +&usb3a_u2phy {
> +	status = "okay";
> +};
> +
> +&usb3a {
> +	dr_mode = "peripheral";
> +	status = "okay";
> +};

After the rebase these should go before &usb3b.

> +
>  &usb3d_u2phy {
>  	status = "okay";
>  };
> diff --git a/arch/riscv/boot/dts/spacemit/k3.dtsi b/arch/riscv/boot/dts/spacemit/k3.dtsi
> index c3f2dce0969c..220dfe29bb78 100644
> --- a/arch/riscv/boot/dts/spacemit/k3.dtsi
> +++ b/arch/riscv/boot/dts/spacemit/k3.dtsi
> @@ -630,6 +630,36 @@ gmac2_axi_setup: stmmac-axi-config {
>  			};
>  		};
>  
> +		usb3a: usb at cad00000 {
> +			compatible = "spacemit,k3-dwc3";
> +			reg = <0x0 0xcad00000 0x0 0x10000>;
> +			interrupts = <118 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-parent = <&saplic>;
> +			clocks = <&syscon_apmu CLK_APMU_USB3_PORTA_BUS>;
> +			clock-names = "usbdrd30";
> +			resets = <&syscon_apmu RESET_APMU_USB3_A_AHB>,
> +				 <&syscon_apmu RESET_APMU_USB3_A_VCC>,
> +				 <&syscon_apmu RESET_APMU_USB3_A_PHY>;
> +			reset-names = "ahb", "vcc", "phy";
> +			phys = <&usb3a_u2phy>;
> +			phy-names = "usb2-phy";
> +			phy_type = "utmi";
> +			snps,dis_enblslpm_quirk;
> +			snps,dis_u2_susphy_quirk;

snps,dis_u3_susphy_quirk is missing too, like usb3b/c/d.

-- 
Troy Mitchell
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 228 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-riscv/attachments/20261102/782765df/attachment.sig>