[PATCH v2 0/2] usb: spacemit: k3: Add USB2.0 support

[PATCH v2 0/2] usb: spacemit: k3: Add USB2.0 support

[Yixun Lan]

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

This series try to add USB2.0 support for SpacemiT K3 SoC, and will
enable it for Pico-ITX board in a separate patch. There is a run-time
dependency on USB phy[1], Hub[2] and reset[3] patches, but each series
should be quite independent, so I intend to not add prerequisite id
for the dependency here.

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

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]

Signed-off-by: Yixun Lan <dlan@kernel.org>
---
Changes in v2:
- separate DT patch out, will send in another series
- document for K1 about why also work with one PHY
- collect tags
- Link to v1: https://lore.kernel.org/r/20260317-02-k3-usb20-support-v1-0-d89f59062ad4@kernel.org

---
Yixun Lan (2):
      dt-bindings: usb: dwc3: spacemit: add support for K3 SoC
      usb: dwc3: dwc3-generic-plat: spacemit: add support for K3 SoC

 Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml | 6 +++++-
 drivers/usb/dwc3/dwc3-generic-plat.c                        | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)
---
base-commit: c4c6e209dcf903ada6ddb4a0baca01ce8459a379
change-id: 20260312-02-k3-usb20-support-9a1893655e9d

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

[PATCH v2 1/2] dt-bindings: usb: dwc3: spacemit: add support for K3 SoC

[Yixun Lan]

Add compatible string for DWC3 USB controller found in SpacemiT K3 SoC.

The USB2.0 host controller in K3 SoC actually use DWC3 IP but only support
USB2.0 functionality, thus in the hardware layer, it has only one USB2 PHY.
While in K1 SoC, the USB controller has both USB2 and USB3 Combo PHY
connected, but able to work in a reduced USB2.0 mode which requres only
one USB2 PHY, leaves the USB3 Combo PHY to PCIe controller. So both K1
and K3 SoC are able to work in the USB2.0 mode which requires one PHY.

Explicitly reduce number of phy property to minimal one.

Signed-off-by: Yixun Lan <dlan@kernel.org>
---
 Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml b/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
index 0f0b5e061ca1..cc27b363ca79 100644
--- a/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
@@ -27,7 +27,9 @@ allOf:
 
 properties:
   compatible:
-    const: spacemit,k1-dwc3
+    enum:
+      - spacemit,k1-dwc3
+      - spacemit,k3-dwc3
 
   reg:
     maxItems: 1
@@ -42,11 +44,13 @@ properties:
     maxItems: 1
 
   phys:
+    minItems: 1
     items:
       - description: phandle to USB2/HS PHY
       - description: phandle to USB3/SS PHY
 
   phy-names:
+    minItems: 1
     items:
       - const: usb2-phy
       - const: usb3-phy

-- 
2.53.0

[PATCH v2 2/2] usb: dwc3: dwc3-generic-plat: spacemit: add support for K3 SoC

[Yixun Lan]

Add support for the DWC3 USB controller which found in SpacemiT K3 SoC.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Yixun Lan <dlan@kernel.org>
---
 drivers/usb/dwc3/dwc3-generic-plat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc3/dwc3-generic-plat.c b/drivers/usb/dwc3/dwc3-generic-plat.c
index e846844e0023..28219968b8b0 100644
--- a/drivers/usb/dwc3/dwc3-generic-plat.c
+++ b/drivers/usb/dwc3/dwc3-generic-plat.c
@@ -212,6 +212,7 @@ static const struct dwc3_generic_config eic7700_dwc3 =  {
 
 static const struct of_device_id dwc3_generic_of_match[] = {
 	{ .compatible = "spacemit,k1-dwc3", },
+	{ .compatible = "spacemit,k3-dwc3", },
 	{ .compatible = "fsl,ls1028a-dwc3", &fsl_ls1028_dwc3},
 	{ .compatible = "eswin,eic7700-dwc3", &eic7700_dwc3},
 	{ /* sentinel */ }

-- 
2.53.0

Re: [PATCH v2 1/2] dt-bindings: usb: dwc3: spacemit: add support for K3 SoC

[Conor Dooley]

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On Fri, Mar 20, 2026 at 07:15:37AM +0000, Yixun Lan wrote:
> Add compatible string for DWC3 USB controller found in SpacemiT K3 SoC.
> 
> The USB2.0 host controller in K3 SoC actually use DWC3 IP but only support
> USB2.0 functionality, thus in the hardware layer, it has only one USB2 PHY.
> While in K1 SoC, the USB controller has both USB2 and USB3 Combo PHY
> connected, but able to work in a reduced USB2.0 mode which requres only
> one USB2 PHY, leaves the USB3 Combo PHY to PCIe controller. So both K1
> and K3 SoC are able to work in the USB2.0 mode which requires one PHY.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

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