linux-kernel - Re: [PATCH v2 2/9] ARM: dts: amlogic: Used onboard usb hub reset to enable usb hub

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Message-ID: <21daccb8-9e27-af65-4b90-4bae062be559@linaro.org>
Date:   Wed, 18 Jan 2023 09:26:42 +0100
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>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-amlogic@...ts.infradead.org,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Johan Hovold <johan@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/9] ARM: dts: amlogic: Used onboard usb hub reset to
 enable usb hub

On 18/01/2023 05:44, Anand Moon wrote:
> On Odroid c1 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 usb hub.
> 
> Add usb hub regulator as per the schematic.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> v2 - drop the vendor name from compatible string.
>     - move the hub node to USB controller node.
>     - drop the usb_otg_pwr since it only liked to OTG port
>       and link p5v0 to the vdd-supply.
> ---
>   arch/arm/boot/dts/meson8b-odroidc1.dts | 24 +++++++++++-------------
>   1 file changed, 11 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
> index 04356bc639fa..d1f9ce4742a8 100644
> --- a/arch/arm/boot/dts/meson8b-odroidc1.dts
> +++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
> @@ -281,19 +281,6 @@ &gpio_ao {
>   			  "J7 Header Pin 6", "J7 Header Pin 5",
>   			  "J7 Header Pin 7", "HDMI_CEC",
>   			  "SYS_LED", "", "";
> -
> -	/*
> -	 * WARNING: The USB Hub on the Odroid-C1/C1+ 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 {
> -		gpio-hog;
> -		gpios = <GPIOAO_4 GPIO_ACTIVE_HIGH>;
> -		output-high;
> -		line-name = "usb-hub-reset";
> -	};
>   };
>   
>   &ir_receiver {
> @@ -381,5 +368,16 @@ &usb1_phy {
>   };
>   
>   &usb1 {
> +	dr_mode = "host";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
>   	status = "okay";
> +
> +	hub@1 {
> +		/* Genesys Logic GL852G usb hub */
> +		compatible = "usb5e3,610";
> +		reg = <1>;
> +		vdd-supply = <&p5v0>;
> +		reset-gpio = <&gpio_ao GPIOAO_4 GPIO_ACTIVE_LOW>;
> +	};
>   };

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>