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

From: Min Guo <min.guo@mediatek.com>
To: Rob Herring <robh@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, tony@atomide.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	hdegoede@redhat.com, chunfeng.yun@mediatek.com,
	Alan Stern <stern@rowland.harvard.edu>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-mediatek@lists.infradead.org, Bin Liu <b-liu@ti.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek musb controller
Date: Thu, 14 Feb 2019 16:30:16 +0800	[thread overview]
Message-ID: <1550133016.12020.13.camel@mhfsdcap03> (raw)
In-Reply-To: <1548382046.4433.304.camel@mhfsdcap03>

Hi Rob,

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

usb2: usb@11200000 {
   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.
> 

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