linux-kernel - Re: [PATCH v2] arm64: allwinner: a64: orangepi-zero-plus2: add usb otg

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Message-ID: <8080607.cgOBd57Bn1@ice-x220i>
Date:   Mon, 15 Jan 2018 16:05:07 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        linux-sunxi@...glegroups.com, Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>
Subject: Re: [PATCH v2] arm64: allwinner: a64: orangepi-zero-plus2: add usb otg

在 2018年1月15日星期一 CST 下午4:01:39，Maxime Ripard 写道：
> Hi,
> 
> On Fri, Jan 12, 2018 at 02:39:04PM +0530, Jagan Teki wrote:
> > Add usb otg support for orangepi-zero-plus2 board:
> > - Add usb_otg node with dr_mode as 'otg'
> > - USB0-IDDET connected to PA21
> > - VBUS connected through DCIN which always on
> > 
> > Tested mass storage function.
> > 
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> > Changes for v2:
> > - Change dr_mode to peripheral
> > 
> >  .../dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts    | 18
> >  ++++++++++++++++++ 1 file changed, 18 insertions(+)
> > 
> > diff --git
> > a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
> > b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts index
> > af43533..6511190 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
> > @@ -73,6 +73,10 @@
> > 
> >  	};
> >  
> >  };
> > 
> > +&ehci0 {
> > +	status = "okay";
> > +};
> > +
> > 
> >  &mmc0 {
> >  
> >  	pinctrl-names = "default";
> >  	pinctrl-0 = <&mmc0_pins_a>;
> > 
> > @@ -111,6 +115,10 @@
> > 
> >  	status = "okay";
> >  
> >  };
> > 
> > +&ohci0 {
> > +	status = "okay";
> > +};
> > +
> > 
> >  &uart0 {
> >  
> >  	pinctrl-names = "default";
> >  	pinctrl-0 = <&uart0_pins_a>;
> > 
> > @@ -122,3 +130,13 @@
> > 
> >  	pinctrl-0 = <&uart1_pins>, <&uart1_rts_cts_pins>;
> >  	status = "okay";
> >  
> >  };
> > 
> > +
> > +&usb_otg {
> > +	dr_mode = "peripheral";
> 
> If VBUS is always on, this can only operate safely in host mode, not
> peripheral.

I think this kind of device is designed to directly drain power from the host 
in peripheral mode.

> 
> Maxime