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

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Message-ID: <20250822200515.GA204607-robh@kernel.org>
Date: Fri, 22 Aug 2025 15:05:15 -0500
From: Rob Herring <robh@...nel.org>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.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 Fri, Aug 22, 2025 at 12:30:05PM +0200, Marco Felsch wrote:
> On 25-08-22, Krzysztof Kozlowski wrote:
> > On Thu, Aug 21, 2025 at 06:31:57PM +0200, Marco Felsch wrote:
> > > Some PCB designs don't connect the USB hub port power control GPIO and
> > > instead make use of a host controllable regulator. Add support for this
> > > use-case by introducing portX-vbus-supply property.
> > > 
> > > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > > ---
> > >  Documentation/devicetree/bindings/usb/microchip,usb2514.yaml | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml b/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml
> > > index 4e3901efed3fcd4fbbd8cb777f9df4fcadf2ca00..ac1e5f1a5ea2e66c61ce92154385952b15e78e55 100644
> > > --- a/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml
> > > @@ -49,6 +49,12 @@ patternProperties:
> > >      $ref: /schemas/usb/usb-device.yaml
> > >      additionalProperties: true
> > >  
> > > +  "^port[1-7]-vbus-supply$":
> > > +    type: object
> > > +    description:
> > > +      Regulator controlling the USB VBUS on portX. Only required if the host
> > > +      controls the portX VBUS.
> > 
> > Your commit msg should briefly describe status of previous discussion:
> > why Rob's comment was not applied. Otherwise we repeat: this looks like
> > property of specific port.
> 
> I answered Rob on my v1 but got no feedback. 

I just read it and don't understand. You don't have to have all 
properties for a driver in the node associated with the driver. The 
driver can freely look in the child nodes or anywhere else in the whole 
tree if needed. Is that what you meant?

For USB hubs we generally define child nodes for each port. Some of the 
hub bindings don't because they are incomplete. If you have a per port 
property, then the DT property belongs in the port's node.

> My v2 caused an issue found
> by Rob's test bot. Therefore I thought he is okay and applied the
> patchset for testing.

Other way around. If it doesn't pass tests, I don't look at it. (Well, I 
do, but don't expect a reply.)

> At least to me it's unclear when Rob's test bot is executed.

When you submit something. It's all automatic, though sometimes the 
emails are delayed. Results are always in PW within 1-2 hours (unless 
someone patch bombs us with a large series).

> 
> > 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
> 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.
> 
> Regards,
>   Marco