linux-kernel - [PATCH v2 3/4] dt-bindings: phy: google: Add Google Tensor G5 USB PHY

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Message-ID: <20251008060000.3136021-4-royluo@google.com>
Date: Wed,  8 Oct 2025 05:59:59 +0000
From: Roy Luo <royluo@...gle.com>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Peter Griffin <peter.griffin@...aro.org>, 
	"André Draszik" <andre.draszik@...aro.org>, Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: Joy Chakraborty <joychakr@...gle.com>, Naveen Kumar <mnkumar@...gle.com>, Roy Luo <royluo@...gle.com>, 
	Badhri Jagan Sridharan <badhri@...gle.com>, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 3/4] 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.

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

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. Currently only
USB high-speed is described and supported.

Signed-off-by: Roy Luo <royluo@...gle.com>
---
 .../bindings/phy/google,gs-usb-phy.yaml       | 96 +++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/google,gs-usb-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/google,gs-usb-phy.yaml b/Documentation/devicetree/bindings/phy/google,gs-usb-phy.yaml
new file mode 100644
index 000000000000..22961e2da6ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/google,gs-usb-phy.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2025, Google LLC
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/google,gs-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Tensor Series (G5+) USB PHY
+
+maintainers:
+  - Roy Luo <royluo@...gle.com>
+
+description: |
+  Describes the USB PHY interfaces integrated with the DWC3 USB controller on
+  Google Tensor SoCs, starting with the G5 generation.
+  Two specific PHY IPs from Synopsys are integrated, including eUSB 2.0 PHY IP
+  and USB 3.2/DisplayPort combo PHY IP.
+  The first phandle argument within the PHY specifier is used to identify the
+  desired PHY. The currently supported value is::
+    0 - USB high-speed.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - google,gs5-usb-phy
+
+  reg:
+    minItems: 3
+    maxItems: 3
+
+  reg-names:
+    items:
+      - const: usb2_cfg_csr
+      - const: dp_top_csr
+      - const: usb_top_cfg_csr
+
+  "#phy-cells":
+    const: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: usb2_phy_clk
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    items:
+      - const: usb2_phy_reset
+
+  power-domains:
+    maxItems: 1
+
+  orientation-switch:
+    type: boolean
+    description:
+      Indicates the PHY as a handler of USB Type-C orientation changes
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - "#phy-cells"
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        usb_phy: usb_phy@...0000 {
+            compatible = "google,gs5-usb-phy";
+            reg = <0 0x0c450014 0 0xc>,
+                  <0 0x0c637000 0 0xa0>,
+                  <0 0x0c45002c 0 0x4>;
+            reg-names = "usb2_cfg_csr", "dp_top_csr", "usb_top_cfg_csr";
+            #phy-cells = <1>;
+            clocks = <&hsion_usb2_phy_reset_clk>;
+            clock-names = "usb2_phy_clk";
+            resets = <&hsion_resets_usb2_phy>;
+            reset-names = "usb2_phy_reset";
+            power-domains = <&hsio_n_usb_pd>;
+            orientation-switch;
+        };
+    };
+...
-- 
2.51.0.710.ga91ca5db03-goog