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

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Message-ID: <CAFBinCCtJbF6UjG3czQjVy_Zy_B4DO8BkcayOqDirn0OXw3PtQ@mail.gmail.com>
Date:   Wed, 28 Dec 2022 13:51:32 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Anand Moon <linux.amoon@...il.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 Anand,

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).

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.


Best regards,
Martin


[0] https://github.com/xdarklight/linux/commit/d8b96e5bc9c20ab2585194e0e59580c3b062c431