linux-kernel - Re: [PATCH v1 03/11] arm64: dts: amlogic: Used onboard usb hub reset on odroid c2

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Date:   Wed, 4 Jan 2023 14:47:36 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     neil.armstrong@...aro.org
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/11] arm64: dts: amlogic: Used onboard usb hub reset
 on odroid c2

Hi Niel,


On Wed, 4 Jan 2023 at 14:26, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 04/01/2023 09:13, Anand Moon wrote:
> > Hi Martin,
> >
> > On Wed, 28 Dec 2022 at 20:14, Anand Moon <linux.amoon@...il.com> wrote:
> >>
> >> Hi Martin,
> >>
> >> On Wed, 28 Dec 2022 at 18:21, Martin Blumenstingl
> >> <martin.blumenstingl@...glemail.com> wrote:
> >>>
> >>> Hi Anand,
> >>>
> >> Thanks for your review comments.
> >>
> >>> thank you for working on this topic!
> >>>
> >>> On Wed, Dec 28, 2022 at 11:05 AM Anand Moon <linux.amoon@...il.com> wrote:
> >>> [...]
> >>>> +       usb {
> >>>> +               dr_mode = "host";
> >>>> +               #address-cells = <1>;
> >>>> +               #size-cells = <0>;
> >>>> +
> >>>> +               hub@1 {
> >>>> +                       /* Genesys Logic GL852G-OHG usb hub */
> >>>> +                       compatible = "genesys,usb5e3,610";
> >>>> +                       reg = <1>;
> >>>> +                       vdd-supply = <&usb_otg_pwr>;
> >>>> +                       reset-gpio = <&gpio_ao GPIOAO_4 GPIO_ACTIVE_LOW>;
> >>>> +               };
> >>>> +       };
> >>> My understanding is that the hub@1 node should be part of the
> >>> corresponding USB controller node, not a new node.
> >>> In this case hub@1 should go into the existing &usb1 node. That way we
> >>> describe the way the hardware is set up (meaning: hub@1 is connected
> >>> to &usb1).
> >>>
> >>
> >> Ok, I will move this code under &usb0 and &usb1 nodes.
> >>
> >> onboard_usb_hub module just assists in usb hub reset.
> >> so these changes are meant to replace the gpio-hog.
> >>
> >> $ dmesg | grep onboard
> >> [    5.405558] usbcore: registered new device driver onboard-usb-hub
> >> [    6.383428] onboard-usb-hub 1-1: reset high-speed USB device number
> >> 2 using dwc2
> >>
> >> Here is the boot log of the odroid c2 [0] https://pastebin.com/PFy5waPb
> >>
> >
> > Moving the usb hub into usb subnode usb0 or usb1 does not work
> > on Odroid n2 and c4, we have a combo phys of usb 2.0 and usb 3.0
> > so the onboard usb hub reset does not get initialized until both the PHY
> > and USB nodes are brought up by the drivers.
>
> Fine, then add a comment before the usb node explaining that.
>

Sure, thanks.

> Thanks,
> Neil
>
Thanks
-Anand