linux-kernel - Re: [PATCH v1] arm64: dts: amlogic: Used onboard usb hub reset on odroid n2

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Message-ID: <9fe7d0d2-3582-4b62-be9b-aa9134c18023@linaro.org>
Date:   Tue, 10 Oct 2023 10:10:55 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Anand Moon <linux.amoon@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: amlogic: Used onboard usb hub reset on
 odroid n2

Hi,

On 10/10/2023 05:24, Anand Moon wrote:
> On Odroid n2/n2+ previously use gpio-hog to reset the usb hub,
> switch to used on-board usb hub reset to enable the usb hub
> and enable power to hub.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>   .../dts/amlogic/meson-g12b-odroid-n2.dtsi     | 36 ++++++++++++-------
>   1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> index 91c9769fda20..9e671444eca6 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> @@ -31,6 +31,30 @@ hub_5v: regulator-hub_5v {
>   		enable-active-high;
>   	};
>   
> +	/* USB hub supports both USB 2.0 and USB 3.0 root hub */
> +	usb-hub {
> +		dr_mode = "host";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		/* 2.0 hub on port 1 */
> +		hub_2_0: hub@1 {
> +			compatible = "usb5e3,610";
> +			reg = <1>;
> +			peer-hub = <&hub_3_0>;

It seems peer-hub is missing from Documentation/devicetree/bindings/usb/genesys,gl850g.yaml, could you add it ?

Thanks,
Neil

> +			vdd-supply = <&usb_pwr_en>;
> +		};
> +
> +		/* 3.0 hub on port 4 */
> +		hub_3_0: hub@2 {
> +			compatible = "usb5e3,620";
> +			reg = <2>;
> +			peer-hub = <&hub_2_0>;
> +			reset-gpios = <&gpio GPIOH_4 GPIO_ACTIVE_LOW>;
> +			vdd-supply = <&vcc_5v>;
> +		};
> +	};
> +
>   	sound {
>   		compatible = "amlogic,axg-sound-card";
>   		model = "ODROID-N2";
> @@ -234,18 +258,6 @@ &gpio {
>   		"PIN_3",  /* GPIOX_17 */
>   		"PIN_5",  /* GPIOX_18 */
>   		"PIN_36"; /* GPIOX_19 */
> -	/*
> -	 * WARNING: The USB Hub on the Odroid-N2 needs a reset signal
> -	 * to be turned high in order to be detected by the USB Controller
> -	 * This signal should be handled by a USB specific power sequence
> -	 * in order to reset the Hub when USB bus is powered down.
> -	 */
> -	usb-hub-hog {
> -		gpio-hog;
> -		gpios = <GPIOH_4 GPIO_ACTIVE_HIGH>;
> -		output-high;
> -		line-name = "usb-hub-reset";
> -	};
>   };
>   
>   &i2c3 {