linux-kernel - Re: [PATCH v4 0/5] Add onboard-dev USB hub host managed vbus handling support

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Message-ID: <20260210123228.wmtyf3ezwratne5k@pengutronix.de>
Date: Tue, 10 Feb 2026 13:32:28 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Ze Huang <huang.ze@...ux.dev>
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>, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH v4 0/5] Add onboard-dev USB hub host managed vbus
 handling support

Hi,

On 26-02-10, Ze Huang wrote:
> On Fri Sep 12, 2025 at 4:22 AM CST, Marco Felsch wrote:
> > Hi,
> >
> > the whole purpose of this series is to make it possible to control the
> > USB VBUS regulators of an USB hub via host managed regulators.
> >
> > Regards,
> >   Marco
> >
> > ---
> > Changes in v4:
> > - dt-bindings: change to vbus-supply and shift doc to usb-device.yaml
> > - onboard_dev: make use of new regulator API to parse child device
> >                regulators.
> > - onboard_dev: drop hard coded downstream port number and make it more
> >                dynamic
> > - onboard_dev: drop limiting support to SMSC hubs
> > - Link to v3: https://lore.kernel.org/r/20250821-v6-16-topic-usb-onboard-dev-v3-0-6d2b38a5d818@pengutronix.de
> >
> > Changes in v3:
> > - fix dt-bindings issues
> > - Link to v2: https://lore.kernel.org/all/20250327172803.3404615-1-m.felsch@pengutronix.de/
> >
> > Changes in v2:
> > - fix compile time errors in case the module builds
> > - Link to v1: https://lore.kernel.org/all/20240807-b4-v6-10-topic-usb-onboard-dev-v1-0-f33ce21353c9@pengutronix.de/
> >
> > ---
> > Marco Felsch (5):
> >       usb: port: track the disabled state
> >       usb: hub: add infrastructure to pass onboard_dev port features
> >       dt-bindings: usb: usb-device: add usb hub port vbus-supply suppport
> >       dt-bindings: usb: microchip,usb2514: add vbus-supply example
> >       usb: misc: onboard_dev: add hub downstream port host vbus-supply handling
> >
> >  .../devicetree/bindings/usb/microchip,usb2514.yaml |   7 ++
> >  .../devicetree/bindings/usb/usb-device.yaml        |   6 ++
> >  drivers/usb/core/hub.c                             |  55 +++++++++-
> >  drivers/usb/core/hub.h                             |   4 +
> >  drivers/usb/core/port.c                            |   6 ++
> >  drivers/usb/misc/onboard_usb_dev.c                 | 117 +++++++++++++++++++++
> >  include/linux/usb.h                                |   3 +
> >  7 files changed, 196 insertions(+), 2 deletions(-)
> > ---
> > base-commit: 038d61fd642278bab63ee8ef722c50d10ab01e8f
> > change-id: 20250821-v6-16-topic-usb-onboard-dev-b8d4d1d8a086
> >
> > Best regards,
> 
> Hi Marco,
> 
> I'm checking in to ask about the status of this patch series.
> 
> We are currently working on the Spacemit K1 SoC and we have a use case
> that requires onboard_dev to manage the USB VBUS regulator. This series
> would be very helpful for us :)

:)

> Link: https://lore.kernel.org/all/DG8QBWSJ79MP.2MVIHFRBX3WXX@linux.dev/

Regarding the status of this series. Rob provided his r-b tag once I
fixed the minor typo. I also need to fix bug [1] which is triggered by
the asix binding. I could move the 'vbus-supply' example to the
usb-device.yaml.

@Greg, @USB-maintainers
Are the driver changes OK?

Regards,
  Marco

[1] https://lore.kernel.org/all/175763620958.1187267.14091957840948870392.robh@kernel.org/


> 
> Best regards,
> Ze Huang
> 
> 

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