[PATCH v3 1/4] dt-bindings: usb: dwc3: Add Google Tensor G5 DWC3

[Roy Luo]

Document the device tree bindings for the DWC3 USB controller found in
Google Tensor SoCs, starting with the G5 generation.

The Tensor G5 silicon represents a complete architectural departure from
previous generations (like gs101), including entirely new clock/reset
schemes, top-level wrapper and register interface. Consequently,
existing Samsung/Exynos DWC3 USB bindings are incompatible, necessitating
this new device tree binding.

The USB controller on Tensor G5 is based on Synopsys DWC3 IP and features
Dual-Role Device single port with hibernation support.

Signed-off-by: Roy Luo <royluo at google.com>
---
 .../bindings/usb/google,gs5-dwc3.yaml         | 141 ++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/google,gs5-dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/google,gs5-dwc3.yaml b/Documentation/devicetree/bindings/usb/google,gs5-dwc3.yaml
new file mode 100644
index 000000000000..6fadea7f41e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/google,gs5-dwc3.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2025, Google LLC
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/google,gs5-dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Tensor Series (G5+) DWC3 USB SoC Controller
+
+maintainers:
+  - Roy Luo <royluo at google.com>
+
+description:
+  Describes the DWC3 USB controller block implemented on Google Tensor SoCs,
+  starting with the G5 generation. Based on Synopsys DWC3 IP, the controller
+  features Dual-Role Device single port with hibernation add-on.
+
+properties:
+  compatible:
+    const: google,gs5-dwc3
+
+  reg:
+    items:
+      - description: Core DWC3 IP registers.
+      - description: USB host controller configuration registers.
+      - description: USB custom interrrupts control registers.
+
+  reg-names:
+    items:
+      - const: dwc3_core
+      - const: host_cfg
+      - const: usbint_cfg
+
+  interrupts:
+    items:
+      - description: Core DWC3 interrupt.
+      - description: High speed power management event for remote wakeup from hibernation.
+      - description: Super speed power management event for remote wakeup from hibernation.
+
+  interrupt-names:
+    items:
+      - const: dwc_usb3
+      - const: hs_pme
+      - const: ss_pme
+
+  clocks:
+    items:
+      - description: Non-sticky module clock.
+      - description: Sticky module clock.
+      - description: USB2 PHY APB clock.
+
+  clock-names:
+    items:
+      - const: non_sticky
+      - const: sticky
+      - const: u2phy_apb
+
+  resets:
+    items:
+      - description: Non-sticky module reset.
+      - description: Sticky module reset.
+      - description: USB2 PHY APB reset.
+      - description: DRD bus reset.
+      - description: Top-level reset.
+
+  reset-names:
+    items:
+      - const: non_sticky
+      - const: sticky
+      - const: u2phy_apb
+      - const: drd_bus
+      - const: top
+
+  power-domains:
+    items:
+      - description: Power switchable domain, the child of top domain.
+          Turning it on puts the controller into full power state,
+          turning it off puts the controller into power gated state.
+      - description: Top domain, the parent of power switchable domain.
+          Turning it on puts the controller into power gated state,
+          turning it off completely shuts off the controller.
+
+  power-domain-names:
+    items:
+      - const: psw
+      - const: top
+
+  iommus:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - power-domains
+  - power-domain-names
+
+allOf:
+  - $ref: snps,dwc3-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        usb at c400000 {
+            compatible = "google,gs5-dwc3";
+            reg = <0 0x0c400000  0 0xd060>, <0 0x0c450000 0 0x14>, <0 0x0c450020 0 0x8>;
+            reg-names = "dwc3_core", "host_cfg", "usbint_cfg";
+            interrupts = <GIC_SPI 580 IRQ_TYPE_LEVEL_HIGH 0>,
+                         <GIC_SPI 597 IRQ_TYPE_LEVEL_HIGH 0>,
+                         <GIC_SPI 598 IRQ_TYPE_LEVEL_HIGH 0>;
+            interrupt-names = "dwc_usb3", "hs_pme", "ss_pme";
+            clocks = <&hsion_usbc_non_sticky_clk>,  <&hsion_usbc_sticky_clk>,
+                     <&hsion_u2phy_apb_clk>;
+            clock-names = "non_sticky", "sticky", "u2phy_apb";
+            resets = <&hsion_resets_usbc_non_sticky>, <&hsion_resets_usbc_sticky>,
+                     <&hsion_resets_u2phy_apb>, <&hsion_resets_usb_drd_bus>,
+                     <&hsion_resets_usb_top>;
+            reset-names = "non_sticky", "sticky", "u2phy_apb", "drd_bus", "top";
+            power-domains = <&hsio_n_usb_psw>, <&hsio_n_usb>;
+            power-domain-names = "psw", "top";
+            phys = <&usb_phy 0>;
+            phy-names = "usb2-phy";
+            snps,quirk-frame-length-adjustment = <0x20>;
+            snps,gfladj-refclk-lpm-sel-quirk;
+            snps,incr-burst-type-adjustment = <4>;
+        };
+    };
+...
-- 
2.51.0.740.g6adb054d12-goog