linux-kernel - Re: [PATCH v3 3/4] dt-bindings: usb: microchip,usb2514: add support for port vbus-supply

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Message-ID: <dc4046e5-7912-4942-b313-20f29213773c@kernel.org>
Date: Sun, 24 Aug 2025 11:03:18 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Fabio Estevam <festevam@...il.com>,
 Matthias Kaehlcke <mka@...omium.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, linux-usb@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 kernel@...gutronix.de
Subject: Re: [PATCH v3 3/4] dt-bindings: usb: microchip,usb2514: add support
 for port vbus-supply

On 22/08/2025 12:30, Marco Felsch wrote:
>> The binding does not list ports now, but lists hard-wired devices, so my
>> question is now: is this per hard-wired device or per port (even if port
>> is hot-pluggable)?
> 
> Sorry but I don't get you. The binding lists the regulators required to
> enable/disable the hub downstream port VBUS. These regulators are

Is the port an external facing connector or a hard-wired USB device
(please read the binding)?

> controlled by an external party e.g. the CPU instead of the USB hub
> itself. The connection from the CPU to the regulator which controlls the
> +5V usb-connector pin is hard-wired, yes.

I speak about USB devices.

Best regards,
Krzysztof