From mboxrd@z Thu Jan  1 00:00:00 1970
From: Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>
Subject: Re: [PATCH v2] arm64: allwinner: a64:
 orangepi-zero-plus2: add usb otg
Date: Mon, 15 Jan 2018 16:05:07 +0800
Message-ID: <8080607.cgOBd57Bn1@ice-x220i>
References: <1515748144-25204-1-git-send-email-jagan@amarulasolutions.com> <20180115080139.k2vrczo3hnvdt3df@flea.lan>
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To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>, Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Michael Trimarchi <michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
List-Id: devicetree@vger.kernel.org

=E5=9C=A8 2018=E5=B9=B41=E6=9C=8815=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=80 CST=
 =E4=B8=8B=E5=8D=884:01:39=EF=BC=8CMaxime Ripard =E5=86=99=E9=81=93=EF=BC=
=9A
> Hi,
>=20
> 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
> >=20
> > Tested mass storage function.
> >=20
> > Signed-off-by: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
> > ---
> > Changes for v2:
> > - Change dr_mode to peripheral
> >=20
> >  .../dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts    | 18
> >  ++++++++++++++++++ 1 file changed, 18 insertions(+)
> >=20
> > 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 @@
> >=20
> >  	};
> > =20
> >  };
> >=20
> > +&ehci0 {
> > +	status =3D "okay";
> > +};
> > +
> >=20
> >  &mmc0 {
> > =20
> >  	pinctrl-names =3D "default";
> >  	pinctrl-0 =3D <&mmc0_pins_a>;
> >=20
> > @@ -111,6 +115,10 @@
> >=20
> >  	status =3D "okay";
> > =20
> >  };
> >=20
> > +&ohci0 {
> > +	status =3D "okay";
> > +};
> > +
> >=20
> >  &uart0 {
> > =20
> >  	pinctrl-names =3D "default";
> >  	pinctrl-0 =3D <&uart0_pins_a>;
> >=20
> > @@ -122,3 +130,13 @@
> >=20
> >  	pinctrl-0 =3D <&uart1_pins>, <&uart1_rts_cts_pins>;
> >  	status =3D "okay";
> > =20
> >  };
> >=20
> > +
> > +&usb_otg {
> > +	dr_mode =3D "peripheral";
>=20
> 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 ho=
st=20
in peripheral mode.

>=20
> Maxime


--=20
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