From: Andre Przywara <andre.przywara@arm.com>
To: Maxime Ripard <maxime@cerno.tech>
Cc: qianfan <qianfanguijin@163.com>,
wens@csie.org, linux-sunxi@lists.linux.dev,
Jernej Skrabec <jernej.skrabec@gmail.com>
Subject: Re: [PATCH 3/3] ARM: dts: sun8i: r40: bananapi-m2-ultra: Enable usb_otg
Date: Fri, 2 Jul 2021 13:24:09 +0100 [thread overview]
Message-ID: <20210702132409.6c2e7bd4@slackpad.fritz.box> (raw)
In-Reply-To: <20210702120601.22k44u6cdlag57ku@gilmour>
On Fri, 2 Jul 2021 14:06:01 +0200
Maxime Ripard <maxime@cerno.tech> wrote:
Hi,
> On Fri, Jul 02, 2021 at 10:46:20AM +0800, qianfan wrote:
> >
> > 在 2021/7/1 22:47, Chen-Yu Tsai 写道:
> > > On Thu, Jul 1, 2021 at 10:37 PM Andre Przywara <andre.przywara@arm.com> wrote:
> > > > On Thu, 1 Jul 2021 09:50:09 +0800
> > > > qianfanguijin@163.com wrote:
> > > >
> > > > Hi,
> > > >
> > > > > From: qianfan Zhao <qianfanguijin@163.com>
> > > > >
> > > > > Enable it.
> > > > >
> > > > > Signed-off-by: qianfan Zhao <qianfanguijin@163.com>
> > > > > ---
> > > > > arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts | 14 ++++++++++++++
> > > > > 1 file changed, 14 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts b/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
> > > > > index a6a1087a0c9b..072535b383b5 100644
> > > > > --- a/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
> > > > > +++ b/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
> > > > > @@ -43,6 +43,7 @@
> > > > >
> > > > > /dts-v1/;
> > > > > #include "sun8i-r40.dtsi"
> > > > > +#include "sunxi-common-regulators.dtsi"
> > > > >
> > > > > #include <dt-bindings/gpio/gpio.h>
> > > > >
> > > > > @@ -299,6 +300,11 @@
> > > > > regulator-name = "vdd1v2-sata";
> > > > > };
> > > > >
> > > > > +®_usb0_vbus {
> > > > > + gpio = <&pio 8 13 GPIO_ACTIVE_HIGH>; /* PI13 */
> > > > > + status = "okay";
> > > > > +};
> > > > So there is the same USB0-DRVVBUS signal connected to this GPIO, but
> > > > also to the AXP's N_VBUSEN line.
> > > >
> > > > Not sure if that means either of them can control the voltage?
> > > It's better to use N_VBUSEN if that is connected. Since the PMIC
> > > may have that pin already enabled, it can cause issues with VBUS
> > > input not being correctly used.
> >
> > I had checked some boards in linux such as sun7i-a20-olinuxino-lime2.dts,
> > they has the same design
> >
> > that enable VBUS by using a gpio and then connect this gpio to PMIC.
> >
> > there is a example:
> >
> > ./sun7i-a20-olinuxino-lime2.dts:®_usb0_vbus {
> > ./sun7i-a20-olinuxino-lime2.dts- gpio = <&pio 2 17 GPIO_ACTIVE_HIGH>;
> > ./sun7i-a20-olinuxino-lime2.dts- status = "okay";
> > ./sun7i-a20-olinuxino-lime2.dts-};
>
> IIRC, the AXP209 typically used with these boards doesn't have a
> N_VBUSEN line
According to the Lime2 schematic and the AXP209 data sheet from the Wiki
it does have N_VBUSEN, from a quick glance with the usual
functionality. And the connection on the Lime2 looks indeed the same,
USB0_DRVVBUS connected to both the PMIC and a GPIO.
(Also the BPi-M2 Ultra has an AXP221 anyway.)
I would lean towards Chen-Yu's suggestion (use the PMIC).
It seems like my BPi M2 Berry uses the same layout, so I can do some
experiments later.
Cheers,
Andre
next prev parent reply other threads:[~2021-07-02 12:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-01 1:50 [PATCH 1/3] phy-sun4i-usb: Fix sun8i_r40_cfg qianfanguijin
2021-07-01 1:50 ` [PATCH 2/3] ARM: dts: sun8i: r40: Add usb_otg device node qianfanguijin
2021-07-01 14:29 ` Andre Przywara
2021-07-01 1:50 ` [PATCH 3/3] ARM: dts: sun8i: r40: bananapi-m2-ultra: Enable usb_otg qianfanguijin
2021-07-01 14:37 ` Andre Przywara
2021-07-01 14:47 ` Chen-Yu Tsai
2021-07-02 2:46 ` qianfan
2021-07-02 12:06 ` Maxime Ripard
2021-07-02 12:24 ` Andre Przywara [this message]
2021-07-02 12:30 ` Chen-Yu Tsai
2021-07-05 3:50 ` qianfan
2021-07-05 6:20 ` Chen-Yu Tsai
2021-07-05 6:29 ` qianfan
2021-07-05 14:20 ` Chen-Yu Tsai
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