Re: [PATCH 2/2] arm64: dts: qcom: monaco-evk: Enable the tertiary USB controller

[Loic Poulain]

On Tue, Mar 3, 2026 at 9:25 AM Swati Agarwal
<swati.agarwal@xxxxxxxxxxxxxxxx> wrote:
>
> On Fri, Feb 13, 2026 at 4:15 PM Loic Poulain
> <loic.poulain@xxxxxxxxxxxxxxxx> wrote:
> >
> > Hi Swati,
> >
> > On Tue, Feb 10, 2026 at 4:54 PM Swati Agarwal
> > <swati.agarwal@xxxxxxxxxxxxxxxx> wrote:
> > >
> > > Enable the tertiary usb controller connected to micro usb port in OTG mode
> > > on Monaco EVK platform.
> > >
> > > Signed-off-by: Swati Agarwal <swati.agarwal@xxxxxxxxxxxxxxxx>
> > > ---
> > >  arch/arm64/boot/dts/qcom/monaco-evk.dts | 53 +++++++++++++++++++++++++
> > >  arch/arm64/boot/dts/qcom/monaco.dtsi    |  7 ++++
> > >  2 files changed, 60 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/monaco-evk.dts b/arch/arm64/boot/dts/qcom/monaco-evk.dts
> > > index 03af9bbcacc9..e6fc6f6a52e1 100644
> > > --- a/arch/arm64/boot/dts/qcom/monaco-evk.dts
> > > +++ b/arch/arm64/boot/dts/qcom/monaco-evk.dts
> > > @@ -27,6 +27,25 @@ chosen {
> > >                 stdout-path = "serial0:115200n8";
> > >         };
> > >
> > > +       connector-2 {
> > > +               compatible = "gpio-usb-b-connector", "usb-b-connector";
> > > +               label = "micro-USB";
> > > +               type = "micro";
> > > +
> > > +               id-gpios = <&pmm8620au_0_gpios 9 GPIO_ACTIVE_HIGH>;
> > > +               vbus-gpios = <&expander6 7 GPIO_ACTIVE_HIGH>;
> > > +               vbus-supply = <&vbus_supply_regulator_2>;
> > > +
> > > +               pinctrl-names = "default";
> > > +               pinctrl-0 = <&usb2_id>;
> > > +
> > > +               port {
> > > +                       usb2_con_hs_ep: endpoint {
> > > +                               remote-endpoint = <&usb_2_dwc3_hs>;
> > > +                       };
> > > +               };
> > > +       };
> > > +
> > >         dmic: audio-codec-0 {
> > >                 compatible = "dmic-codec";
> > >                 #sound-dai-cells = <0>;
> > > @@ -77,6 +96,15 @@ platform {
> > >                         };
> > >                 };
> > >         };
> > > +
> > > +       vbus_supply_regulator_2: vbus-supply-regulator-2 {
> > > +               compatible = "regulator-fixed";
> > > +               regulator-name = "vbus_supply_2";
> > > +               gpio = <&pmm8650au_1_gpios 7 GPIO_ACTIVE_HIGH>;
> > > +               regulator-min-microvolt = <5000000>;
> > > +               regulator-max-microvolt = <5000000>;
> > > +               enable-active-high;
> > > +       };
> > >  };
> > >
> > >  &apps_rsc {
> > > @@ -484,6 +512,16 @@ &pcieport1 {
> > >         wake-gpios = <&tlmm 21 GPIO_ACTIVE_HIGH>;
> > >  };
> > >
> > > +&pmm8620au_0_gpios {
> > > +       usb2_id: usb2-id-state {
> > > +               pins = "gpio9";
> > > +               function = "normal";
> > > +               input-enable;
> > > +               bias-pull-up;
> > > +               power-source = <0>;
> > > +       };
> > > +};
> > > +
> > >  &qupv3_id_0 {
> > >         firmware-name = "qcom/qcs8300/qupv3fw.elf";
> > >         status = "okay";
> > > @@ -690,3 +728,18 @@ &usb_qmpphy {
> > >
> > >         status = "okay";
> > >  };
> > > +
> > > +&usb_2 {
> > > +       status = "okay";
> > > +};
> > > +
> > > +&usb_2_dwc3_hs {
> > > +       remote-endpoint = <&usb2_con_hs_ep>;
> > > +};
> > > +
> > > +&usb_2_hsphy {
> > > +       vdda-pll-supply = <&vreg_l7a>;
> > > +       vdda18-supply = <&vreg_l7c>;
> > > +       vdda33-supply = <&vreg_l9a>;
> > > +       status = "okay";
> > > +};
> >
> > I noticed that usb_2/hs doesn’t work properly unless refgen is
> > supplied. It may appear to work on your setup if another PHY or
> > subsystem enables refgen, either explicitly in software (e.g. DSI) or
> > indirectly, such as through DP, which might be voting for it behind
> > the scenes.
>
> Hi Loic,
>
> Are you facing issues with this patch set? or your patch set that was
> raised as below?

Both. I'm basically running Debian with kernel mainline and your
series, booting from eMMC.
Usb seems to enumerate a boot time but is then unusable.

# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0781:5580 SanDisk Corp. SDCZ80 Flash Drive
#  dd if=/dev/zero of=/dev/sda bs=1MB count=10
[  225.248307] xhci-hcd xhci-hcd.0.auto: xHCI host not responding to
stop endpoint command
[  225.290186] xhci-hcd xhci-hcd.0.auto: xHCI host controller not
responding, assume dead
[  225.298385] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
[  225.307748] usb 1-1: USB disconnect, device number 2

It starts to work if I add the following in the monaco-evk devicetree:
&refgen{
    regulator-always-on;
};

# dd if=/dev/zero of=/dev/sda bs=1MB count=10
10+0 records in
10+0 records out
10000000 bytes (10 MB, 9.5 MiB) copied, 0.7521 s, 13.3 MB/s
# No more USB errors...

Regards,
Loic