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@xxxxxxxxxxxxxxxxxxxx>
> > ---
> > 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
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