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

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Date:   Wed, 28 Dec 2022 20:14:26 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...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 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

> In case hub@1 is not detected within &usb1 then you may need something
> like [0] (not tested for your use-case).
> If that helps: feel free to include that patch in your series.
>

Thanks, will check if this is needed in this case. As of now it just
reinitializes the hub.

>
> Best regards,
> Martin
>
>
> [0] https://github.com/xdarklight/linux/commit/d8b96e5bc9c20ab2585194e0e59580c3b062c431

Thanks
-Anand