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@microchip.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/36d448dd10bbb2bbfa5b1b6b6e3fee86c34d01aa.1766405010.git.tommaso.merciai.xr@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml b/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
index 2cd0efa75f81dd1c82690251ac9da01f7b39562a..448da30757f27aea7fa5aeea290f0dc6e13b894f 100644 (file)
--- 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: