From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: "Måns Rullgård" <mans@mansr.com>
Cc: Rob Herring <robh@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RESEND][PATCH 1/2] dt-bindings: usb: add non-removable-ports hub property
Date: Tue, 28 Jan 2020 14:47:45 +0100 [thread overview]
Message-ID: <20200128134745.GA3048749@kroah.com> (raw)
In-Reply-To: <yw1xy2tsvnww.fsf@mansr.com>
On Mon, Jan 27, 2020 at 04:56:15PM +0000, Måns Rullgård wrote:
> Rob Herring <robh@kernel.org> writes:
>
> > On Fri, Jan 24, 2020 at 03:25:03PM +0000, Mans Rullgard wrote:
> >> Add a non-removable-ports property that lists the hardwired downstream
> >> ports of a hub. Although hubs can provide this information, they are
> >> not always configured correctly. An alternate means of indicating this
> >> for built-in USB devices is thus useful.
> >>
> >> Signed-off-by: Mans Rullgard <mans@mansr.com>
> >
> > I reviewed this already, but since you didn't add my reviewed-by, I'm
> > looking at it again and having 2nd thoughts.
> >
> >> ---
> >> Documentation/devicetree/bindings/usb/usb-device.txt | 4 ++++
> >> 1 file changed, 4 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt
> >> index 036be172b1ae..92d863cc96b6 100644
> >> --- a/Documentation/devicetree/bindings/usb/usb-device.txt
> >> +++ b/Documentation/devicetree/bindings/usb/usb-device.txt
> >> @@ -66,6 +66,10 @@ Required properties for host-controller nodes with device nodes:
> >> - #size-cells: shall be 0
> >>
> >>
> >> +Optional properties for hub and host-controller nodes:
> >> +- non-removable-ports: list of hardwired downstream ports
> >
> > If you have a hardwired device and need to know that, doesn't that imply
> > there's some other stuff you need to describe beyond what a standard USB
> > device has. Such as a power supply that's not Vbus from the hub.
>
> I suppose there could be, but there isn't in my actual situation.
>
> > At a minimum, I think this should be a per port property.
>
> That's what I suggested first. Greg told me to do it like this instead.
I said that? I do not remember discussing this at all, when did that
happen?
> > Though really, I think this should just be implied by describing the
> > device in DT. I'm not sure if there's a case for hotpluggable devices
> > described in DT. Maybe with overlays.
>
> That's also an option. Greg, what do you think?
I have no idea, sorry, I'm totally lost here...
greg k-h
>
> --
> Måns Rullgård
next prev parent reply other threads:[~2020-01-28 13:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 15:25 [RESEND][PATCH 1/2] dt-bindings: usb: add non-removable-ports hub property Mans Rullgard
2020-01-24 15:25 ` [RESEND][PATCH 2/2] usb: hub: use non-removable-ports DT property Mans Rullgard
2020-01-28 16:51 ` Greg Kroah-Hartman
2020-01-27 15:35 ` [RESEND][PATCH 1/2] dt-bindings: usb: add non-removable-ports hub property Rob Herring
2020-01-27 16:56 ` Måns Rullgård
2020-01-28 13:47 ` Greg Kroah-Hartman [this message]
2020-01-28 15:15 ` Måns Rullgård
2020-01-28 15:28 ` Greg Kroah-Hartman
2020-01-28 16:52 ` Greg Kroah-Hartman
2020-01-28 18:21 ` Rob Herring
2020-01-30 17:06 ` Måns Rullgård
2020-01-28 17:27 ` Rob Herring
2020-01-28 16:53 ` Greg Kroah-Hartman
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