dt-bindings: phy: google: Add Google Tensor G5 USB PHY

Document the device tree bindings for the USB PHY interfaces integrated
with the DWC3 controller on Google Tensor SoCs, starting with G5
generation (Laguna). The USB PHY on Tensor G5 includes two integrated
Synopsys PHY IPs: the eUSB 2.0 PHY IP and the USB 3.2/DisplayPort combo
PHY IP.

Due to a complete architectural overhaul in the Google Tensor G5, the
existing Samsung/Exynos USB PHY binding for older generations of Google
silicons such as gs101 are no longer compatible, necessitating this new
device tree binding.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Roy Luo <royluo@google.com>
Link: https://patch.msgid.link/20251227-phyb4-v10-1-e8caf6b93fe7@google.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/Documentation/devicetree/bindings/phy/google,lga-usb-phy.yaml b/Documentation/devicetree/bindings/phy/google,lga-usb-phy.yaml
new file mode 100644 (file)
index 0000000..427e2e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/google,lga-usb-phy.yaml
@@ -0,0 +1,133 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2025, Google LLC
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/google,lga-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Tensor Series G5 (Laguna) USB PHY
+
+maintainers:
+  - Roy Luo <royluo@google.com>
+
+description:
+  Describes the USB PHY interfaces integrated with the DWC3 USB controller on
+  Google Tensor SoCs, starting with the G5 generation (laguna).
+  Two specific PHY IPs from Synopsys are integrated, including eUSB 2.0 PHY IP
+  and USB3.2/DisplayPort combo PHY IP.
+
+properties:
+  compatible:
+    const: google,lga-usb-phy
+
+  reg:
+    items:
+      - description: USB3.2/DisplayPort combo PHY core registers.
+      - description: USB3.2/DisplayPort combo PHY Type-C Assist registers.
+      - description: eUSB 2.0 PHY core registers.
+      - description: Top-level wrapper registers for the integrated PHYs.
+
+  reg-names:
+    items:
+      - const: usb3_core
+      - const: usb3_tca
+      - const: usb2_core
+      - const: usbdp_top
+
+  "#phy-cells":
+    description: |
+      The phandle's argument in the PHY specifier selects one of the three
+      following PHY interfaces.
+      - 0 for USB high-speed.
+      - 1 for USB super-speed.
+      - 2 for DisplayPort.
+    const: 1
+
+  clocks:
+    items:
+      - description: USB2 PHY clock.
+      - description: USB2 PHY APB clock.
+      - description: USB3.2/DisplayPort combo PHY clock.
+      - description: USB3.2/DisplayPort combo PHY firmware clock.
+
+  clock-names:
+    items:
+      - const: usb2
+      - const: usb2_apb
+      - const: usb3
+      - const: usb3_fw
+
+  resets:
+    items:
+      - description: USB2 PHY reset.
+      - description: USB2 PHY APB reset.
+      - description: USB3.2/DisplayPort combo PHY reset.
+
+  reset-names:
+    items:
+      - const: usb2
+      - const: usb2_apb
+      - const: usb3
+
+  power-domains:
+    maxItems: 1
+
+  orientation-switch:
+    type: boolean
+    description:
+      Indicates the PHY as a handler of USB Type-C orientation changes
+
+  google,usb-cfg-csr:
+    description:
+      A phandle to a syscon node used to access the USB configuration
+      registers. These registers are the top-level wrapper of the USB
+      subsystem and provide control and status for the integrated USB
+      controller and USB PHY.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to the syscon node.
+          - description: USB2 PHY configuration register offset.
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - "#phy-cells"
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - power-domains
+  - orientation-switch
+  - google,usb-cfg-csr
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        usb-phy@c410000 {
+            compatible = "google,lga-usb-phy";
+            reg = <0 0x0c410000 0 0x20000>,
+                  <0 0x0c430000 0 0x1000>,
+                  <0 0x0c440000 0 0x10000>,
+                  <0 0x0c637000 0 0xa0>;
+            reg-names = "usb3_core", "usb3_tca", "usb2_core", "usbdp_top";
+            #phy-cells = <1>;
+            clocks = <&hsion_usb2_phy_clk>, <&hsion_u2phy_apb_clk>,
+                     <&hsion_usb3_phy_clk>, <&hsion_usb3_phy_fw_clk>;
+            clock-names = "usb2", "usb2_apb", "usb3", "usb3_fw";
+            resets = <&hsion_resets_usb2_phy>,
+                     <&hsion_resets_u2phy_apb>,
+                     <&hsion_resets_usb3_phy>;
+            reset-names = "usb2", "usb2_apb", "usb3";
+            power-domains = <&hsio_n_usb_pd>;
+            orientation-switch;
+            google,usb-cfg-csr = <&usb_cfg_csr 0x14>;
+        };
+    };
+...

diff --git a/MAINTAINERS b/MAINTAINERS
index 1194f5cd7c7d296017fa1bf456175184f1a44b37..e9b8dfbbb7781485f8a7afbf68940fb8835259eb 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10723,6 +10723,7 @@ S:      Maintained
 P:     Documentation/process/maintainer-soc-clean-dts.rst
 C:     irc://irc.oftc.net/pixel6-kernel-dev
 F:     Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
+F:     Documentation/devicetree/bindings/phy/google,lga-usb-phy.yaml
 F:     Documentation/devicetree/bindings/soc/google/google,gs101-pmu-intr-gen.yaml
 F:     arch/arm64/boot/dts/exynos/google/
 F:     drivers/clk/samsung/clk-gs101.c