linux-kernel - [PATCH v4 09/22] dt-bindings: phy: renesas,usb2-phy: Document mux-states property

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Message-ID: <b86bdc6a5015e0265732ac998ffa50f940bdbfc4.1763737324.git.tommaso.merciai.xr@bp.renesas.com>
Date: Fri, 21 Nov 2025 16:11:58 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: tomm.merciai@...il.com
Cc: linux-renesas-soc@...r.kernel.org,
	biju.das.jz@...renesas.com,
	Tommaso Merciai <tommaso.merciai.xr@...renesas.com>,
	Peter Rosin <peda@...ntia.se>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	Conor Dooley <conor.dooley@...rochip.com>
Subject: [PATCH v4 09/22] dt-bindings: phy: renesas,usb2-phy: Document mux-states property

Some Renesas SoCs, such as RZ/G3E, provide a USB2.0 OTG PHY with
configurable VBUS control through a multiplexed hardware register.
This register allows selecting the VBUS source via a mux control
line exposed by the PHY.

To represent this hardware configuration, support the standard
`mux-states` property in the Renesas USB2 PHY binding.
This allows the DeviceTree to model the VBUS source selection as
a mux, consistent with generic binding conventions.

Acked-by: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
---
v3->v4:
 - Collected CDooley tag.

v2->v3:
 - Improved commit body.
 - Improved mux-states description.

v1->v2:
 - New patch

 Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml b/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
index 2cd0efa75f81..448da30757f2 100644
--- a/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
@@ -102,6 +102,11 @@ properties:
 
   dr_mode: true
 
+  mux-states:
+    description:
+      phandle to a mux controller node that select the source for USB VBUS.
+    maxItems: 1
+
 if:
   properties:
     compatible:
-- 
2.43.0