linux-kernel - Re: [PATCH v2 2/6] dt-bindings: usb: Add binding for Genesys Logic GL850G hub controller

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Date:   Sat, 03 Dec 2022 01:00:39 +0800
From:   Icenowy Zheng <uwu@...nowy.me>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: usb: Add binding for Genesys Logic
 GL850G hub controller

在 2022-12-02星期五的 17:59 +0100，Krzysztof Kozlowski写道：
> On 02/12/2022 17:54, Icenowy Zheng wrote:
> > 在 2022-12-02星期五的 10:02 +0100，Krzysztof Kozlowski写道：
> > > On 02/12/2022 09:16, Icenowy Zheng wrote:
> > > > The Genesys Logic GL850G is a USB 2.0 Single TT hub controller
> > > > that
> > > > features 4 downstream ports, an internal 5V-to-3.3V LDO
> > > > regulator
> > > > (can
> > > > be bypassed) and an external reset pin.
> > > > 
> > > > Add a device tree binding for its USB protocol part. The
> > > > internal
> > > > LDO is
> > > > not covered by this and can just be modelled as a fixed
> > > > regulator.
> > > > 
> > > > Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> > > > ---
> > > > Changes in v2:
> > > > - Misc fixes suggested by Krzysztof, including property
> > > > descriptions,
> > > >   single-item "items" and fixing the example's gpio property.
> > > > - Fixed $id.
> > > > 
> > > (...)
> > > 
> > > > +
> > > > +examples:
> > > > +  - |
> > > > +    usb {
> > > > +        dr_mode = "host";
> > > > +        #address-cells = <1>;
> > > > +        #size-cells = <0>;
> > > > +
> > > > +        hub: hub@1 {
> > > > +            compatible = "usb5e3,608";
> > > > +            reg = <1>;
> > > > +            reset-gpios = <&pio 7 2>;
> > > 
> > > Use GPIO flags. What did you fix in the example?
> > 
> > It used to be here, but using it needs another include, which I
> > don't
> > think it necessary here.
> 
> The header is necessary for the flags...
> 
> > 
> > Maybe I should just drop this line in the example?
> 
> It's useful. The example should be rather complete, not just
> compatible
> and reg.
> 
> Different problem - you miss maxItems for the GPIOs.

Okay thanks.

> 
> Best regards,
> Krzysztof
>