linux-kernel - Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek musb controller

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Message-ID: <1550133016.12020.13.camel@mhfsdcap03>
Date:   Thu, 14 Feb 2019 16:30:16 +0800
From:   Min Guo <min.guo@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Bin Liu <b-liu@...com>, Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <hdegoede@...hat.com>,
        <tony@...mide.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        <chunfeng.yun@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek
 musb controller

Hi Rob,

Sorry to bother you again.
Can I describe usb-connector in usb node like this?

usb2: usb@...00000 {
   compatible = "mediatek,mt2701-musb";
                "mediatek,mtk-musb";
   reg = <0 0x11200000 0 0x1000>;
   ...
   usb_connector: musb_connector {
       compatible = "usb-b-connector";
       label = "micro-USB";
       type = "micro";
       extcon = <&extcon_usb>;
       vbus-supply = <&usb_vbus>;
   };
};

Regards,
Min.


On Fri, 2019-01-25 at 10:07 +0800, Min Guo wrote:
> Hi Bin,
> 
> Thanks for your help.
> 
> Hi Rob,
> 
> I find that Samsung describes the usb-connector attribute in DTS, and
> uses a private driver.
> And try to write DTS as following:
> 
> usb-connector node:
> musb_con: musb_connector{
>     compatible = "linux,extcon-usb-gpio","usb-b-connector";
>     lable = "micro-USB";
>     type = "micro";
>     id-gpio = <&pio 44 GPIO_ACTIVE_HIGH>
>     vbus-supply = <&usb_vbus>;
>     port {
>         usb_to_connector: endpoint {
>             remote-endpoint = <&connector_to_usb>;
>         };
>     };
> };
> 
> usb node:
> &usb2{
>     status = "okay";
>     port {
>         connector_to_usb: endpoint {
>             remote-endpoint = <&usb_to_connector>;
>         };
>     };
> }
> 
> Can I describe usb-connector like this? Or can you give me some advices?
> 
> Regards,
> Min.
> 
> On Tue, 2019-01-22 at 08:33 -0600, Bin Liu wrote:
> > Hi Min,
> > 
> > On Tue, Jan 22, 2019 at 05:36:13PM +0800, Min Guo wrote:
> > > Hi Bin,
> > > 
> > > Sorry to bother you again, I encounter a problem about the extcon
> > > property.
> > > 
> > > I don't find a common driver describing the usb-connector. Is
> > > there any driver that I can refer to, specially the way to switch MUSB
> > > controller between host and device mode? 
> > > If it needs to implement by myself, is it possible to emulate an
> > > usb-connector driver by extcon-usb-gpio, and also use the notifier
> > > mechanism or can you give me some advices?
> > 
> > I am afraid I am unable to help you on this. I wasn't really pay
> > attention when usb-connector was introduced and not sure how it can
> > replace extcon. Now after read usb-connector.txt, it seems the binding
> > only defines a/b/c-connector, but not ab-connector, and there is no
> > enough information (at least for me) explaining how VBUS and ID fix into
> > this usb-connector binding.
> > 
> > Maybe Rob can provide some hint.
> > 
> > Regards,
> > -Bin.
>