linux-kernel - Re: [PATCH v4 2/6] dt-bindings: usb: add binding for Type-B GPIO connector driver

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Date:   Sun, 28 Apr 2019 09:50:57 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Li Jun <jun.li@....com>,
        "Badhri Jagan Sridharan" <badhri@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Min Guo <min.guo@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Biju Das <biju.das@...renesas.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 2/6] dt-bindings: usb: add binding for Type-B GPIO
 connector driver

On Fri, 2019-04-26 at 15:45 -0500, Rob Herring wrote:
> On Fri, Apr 26, 2019 at 02:47:13PM +0800, Chunfeng Yun wrote:
> > It's used to support dual role switch via GPIO when use Type-B
> > receptacle, typically the USB ID pin is connected to an input
> > GPIO pin
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> > v4 no changes
> > 
> > v3 changes:
> >  1. treat type-B connector as a virtual device, but not child device of
> >     USB controller's
> > 
> > v2 changes:
> >   1. new patch to make binding clear suggested by Hans
> > ---
> >  .../bindings/usb/typeb-conn-gpio.txt          | 49 +++++++++++++++++++
> >  1 file changed, 49 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
> > new file mode 100644
> > index 000000000000..d2e1c4e01b6d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
> > @@ -0,0 +1,49 @@
> > +USB Type-B GPIO Connector
> > +
> > +This is a virtual device used to switch dual role mode from the USB ID pin
> > +connected to an input GPIO pin.
> > +
> > +Required properties:
> > +- compatible : Should be "linux,typeb-conn-gpio"
> 
> There's no need for this virtual node. The USB host or device driver can 
> instantiate a connector driver by walking the OF graph to the connector 
> and creating a device.
Got it.
> 
> > +
> > +Sub-nodes:
> > +- connector : should be present.
> > +	- compatible : should be "usb-b-connector".
> > +	- id-gpios, vbus-gpios : either one of them must be present,
> > +		and both can be present as well.
> > +	- vbus-supply : can be present if needed when supports dual role mode.
> > +	see connector/usb-connector.txt
> > +
> > +- port : should be present.
> > +	see graph.txt
> > +
> > +Example:
> > +
> > +rsw_iddig: role_sw_iddig {
> > +	compatible = "linux,typeb-conn-gpio";
> > +	status = "okay";
> > +
> > +	connector {
> > +		compatible = "usb-b-connector";
> > +		label = "micro-USB";
> > +		type = "micro";
> > +		id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
> > +		vbus-supply = <&usb_p0_vbus>;
> > +	};
> > +
> > +	port {
> 
> Humm, same mistake as Hikey patches...
> 
> This goes under the connector node as defined in the connector binding.
Ok, will fix it.

Thanks a lot.

> 
> > +		bconn_ep: endpoint@0 {
> > +			remote-endpoint = <&usb_role_sw>;
> > +		};
> > +	};
> > +};
> > +
> > +&mtu3 {
> > +	status = "okay";
> > +
> > +	port {
> > +		usb_role_sw: endpoint@0 {
> > +			remote-endpoint = <&bconn_ep>;
> > +		};
> > +	};
> > +};
> > -- 
> > 2.21.0
> >