linux-kernel - Re: [PATCH v1 01/11] dt-bindings: usb: Add device id for Genesys Logic hub controller

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Message-ID: <Y7YDwJX6aqa8vbQK@google.com>
Date:   Wed, 4 Jan 2023 22:54:56 +0000
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Icenowy Zheng <uwu@...nowy.me>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-amlogic@...ts.infradead.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 01/11] dt-bindings: usb: Add device id for Genesys
 Logic hub controller

On Wed, Dec 28, 2022 at 03:59:17PM +0530, Anand Moon wrote:
> Hi Icenowy,
> 
> Thanks for the review comments
> 
> On Wed, 28 Dec 2022 at 15:38, Icenowy Zheng <uwu@...nowy.me> wrote:
> >
> > 在 2022-12-28星期三的 10:03 +0000，Anand Moon写道：
> > > Add usb hub device id for Genesys Logic, Inc. GL852G-OHG Hub USB 2.0
> > > root hub and Genesys Logic, Inc. GL3523-QFN76 USB 3.1 root hub.

nit: QFN 76 is one of the package options of the GL3523, I expect this
binding to be applicable as well for other GL3523 variants, so I'd suggest
to drop the suffix. Not sure what 'OHG' stands for, the Genesys website
only lists a GL852G hub with different package types (none of them 'OHG'),
so I'd say drop the suffix unless it is known that 'OHG' variant uses
a different product id than other GL852G variants

> > >
> > > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > > ---
> > >  Documentation/devicetree/bindings/usb/genesys,gl850g.yaml | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git
> > > a/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> > > b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> > > index a9f831448cca..db009f3ef438 100644
> > > --- a/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> > > @@ -16,6 +16,8 @@ properties:
> > >    compatible:
> > >      enum:
> > >        - usb5e3,608
> > > +      - genesys,usb5e3,610
> > > +      - genesys,usb5e3,620
> >
> > I don't think genesys, is needed here because usb5e3 means USB VID
> > 0x05e3, which is already linked to Genesys Logic.
> >
> 
> Ok, I added this as genesys, is it part of the manufacturer or vendor name
> which is most commonly used for adding vendor-specific compatible strings.

That doesn't follow the generic USB binding, please drop 'genesys,'.

> > In addition, the control logic of these two hubs are needed to be
> > verified.
> 
> We were using gpio-hog to reset the USB hub, so now switch to USB onboard hub
> 
> >
> > And what's the status of the companion hub of the USB3 hub? Is it
> > really a USB3-only hub, or is its USB2 part just equal to another USB3
> > hub?
> >
> usb5e3,610 is USB 2.0 port hub present on Odroid C1 and Odroid C2 board
> 
> usb5e3,620 is USB 3.1 port hub present on Odroid N2.

Like Icenowy I would expect the GL3523 to provide also a 2.0 hub.

What is the output of 'lsusb' on the Odroid N2?