linux-kernel - Re: [PATCH v4 07/10] dt-bindings: phy: add binding for Allwinner USB3 PHY

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Date:   Thu, 18 Oct 2018 08:58:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     devicetree@...r.kernel.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Chen-Yu Tsai <wens@...e.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 07/10] dt-bindings: phy: add binding for Allwinner USB3 PHY

On Sat, Oct 13, 2018 at 9:42 PM Icenowy Zheng <icenowy@...c.io> wrote:
>
> 在 2018-10-05五的 15:58 -0500，Rob Herring写道：
> > On Thu, Oct 04, 2018 at 08:28:52PM +0800, Icenowy Zheng wrote:
> > > The new Allwinner H6 SoC contains a USB3 PHY that is wired to the
> > > external USB3 pins of the SoC.
> > >
> > > Add a device tree binding for the PHY.
> > >
> > > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > > Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> > > ---
> > > Changes in v4:
> > > - Changed Vbus regulator property to vbus-supply.
> > >
> > > Changes in v3:
> > > - Added Chen-Yu's Review tag.
> > >
> > > No changes in v2, v1.
> > >
> > >  .../bindings/phy/sun50i-usb3-phy.txt          | 23
> > > +++++++++++++++++++
> > >  1 file changed, 23 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/phy/sun50i-
> > > usb3-phy.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/phy/sun50i-usb3-
> > > phy.txt b/Documentation/devicetree/bindings/phy/sun50i-usb3-phy.txt
> > > new file mode 100644
> > > index 000000000000..9f49c6b8c7e7
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/phy/sun50i-usb3-phy.txt
> > > @@ -0,0 +1,23 @@
> > > +Allwinner sun50i USB3 PHY
> > > +-----------------------
> > > +
> > > +Required properties:
> > > +- compatible : should be one of
> > > +  * allwinner,sun60i-h6-usb3-phy
> > > +- reg : a list of offset + length pairs
> > > +- #phy-cells : from the generic phy bindings, must be 0
> > > +- clocks : phandle + clock specifier for the phy clock
> > > +- resets : phandle + reset specifier for the phy reset
> > > +
> > > +Optional Properties:
> > > +- vbus-supply : a phandle to a regulator that provides power to
> > > VBUS.
> >
> > This belongs in a connector node as it is part of the connector
> > unless
> > the phy physically needs Vbus for power.
> >
> > But others have done this, so all the phys can just be wrong...
>
> How should we reference the connector?
>
> Via OF graph or simply a property in PHY node?

The connector is either a child of the controller or an OF graph from
the controller to the connector. The phy driver needs the controller
node and then it can walk the tree or graph to get the connector node.

Rob