linux-kernel - [PATCH v3 1/3] dt-bindings: usb: usb251xb: support usage case without I2C control

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Message-ID: <20250820161743.23458-2-jszhang@kernel.org>
Date: Thu, 21 Aug 2025 00:17:41 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Richard Leitner <richard.leitner@...ux.dev>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/3] dt-bindings: usb: usb251xb: support usage case without I2C control

Currently, the usb251xb assumes i2c control, and the corresponding
dt node looks like the following:

i2c {
	usb-hub@2c {
		compatible = "microchip,usb2512b";
		reg = <0x2c>;
		reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
	};
};

But from HW point of view, the hub supports usage case without any i2c
control, I.E we only want the gpio controls, for example the following
dt node:

usb-hub {
	compatible = "microchip,usb2512b";
	reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
};

Modify the dt-binding of usb2512b to support this usage case, and add
usage example to the examples section.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 Documentation/devicetree/bindings/usb/usb251xb.yaml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/usb251xb.yaml b/Documentation/devicetree/bindings/usb/usb251xb.yaml
index ac5b99710332..0329a6aaaa92 100644
--- a/Documentation/devicetree/bindings/usb/usb251xb.yaml
+++ b/Documentation/devicetree/bindings/usb/usb251xb.yaml
@@ -240,7 +240,6 @@ additionalProperties: false
 
 required:
   - compatible
-  - reg
 
 examples:
   - |
@@ -269,3 +268,11 @@ examples:
         swap-dx-lanes = <1 2>;
       };
     };
+
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    usb-hub {
+      /* I2C is not connected */
+      compatible = "microchip,usb2512b";
+      reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
+    };
-- 
2.50.0