linux-kernel - Re: [PATCH v7 2/2] arm64: dts: amlogic: Used onboard usb hub reset on odroid n2

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Date: Mon, 24 Jun 2024 10:15:28 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Anand Moon <linux.amoon@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.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 v7 2/2] arm64: dts: amlogic: Used onboard usb hub reset on
 odroid n2

Hi,

On 13/06/2024 14:30, 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>
> ---
> v7:none
> V6:none
> V5:none
> V4:none
> V3:none
> V2:none
> V1:none
> ---
>   .../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 d80dd9a3da31..86eb81112232 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>;
> +			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>;
> +		};
> +	};

Why is this nodes under / and not the dwc3 node ????

With this current DT, there's no way for the usb controller
to find those usb devices subnodes in /usb-hub, and it's clearly
not described like this in the bindings.

Neil

> +
>   	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 {