linux-kernel - Re: [PATCHv3 1/6] ARM: dts: meson8b: odroidc1: Add usb phy power node

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Date:   Mon, 30 Aug 2021 09:45:26 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Anand Moon <linux.amoon@...il.com>, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Matt Corallo <oc2udbzfd@...tcorallo.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Emiliano Ingrassia <ingrassia@...genesys.com>,
        Brian Kim <brian.kim@...dkernel.com>
Subject: Re: [PATCHv3 1/6] ARM: dts: meson8b: odroidc1: Add usb phy power node

Hi,

On 17/08/2021 06:15, Anand Moon wrote:
> Add missing usb phy power node for usb node fix below warning.
> P5V0 regulator supply input voltage range to USB host controller.
> As described in the C1+ schematics, GPIO GPIOAO_5 is used to
> enable input power to USB ports, set it to Active Low.
> 
> [    1.260772] dwc2 c90c0000.usb: Looking up vbus-supply from device tree
> [    1.260784] dwc2 c90c0000.usb: Looking up vbus-supply property in
> 		mode /soc/usb@...c0000 failed

First of all, DT is not here to fix boot message.

Secondly, if the vbus-supply is optional, the message should be removed from
the driver/regulator core instead.

Finally, I looked at the Odroid-C1 schematics and the GPIOAO.BIT5 is an input
to the S805, and the PWREN signal is controlled by the USB Hub so this regulator
should not be added at all.

Neil

> 
> Fixes: 2eb79a4d15ff (ARM: dts: meson: enabling the USB Host
> 		controller on Odroid-C1/C1+ board)
> 
> Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> V2 > changes gpio polarity ACTIVE_HIGH to ACTIVE_LOW.
>      Fix the source power from phy-supply to vbus-supply.
> 
> [1] https://lore.kernel.org/linux-devicetree/20210716103651.1455-2-linux.amoon@gmail.com/
> 
> V1 > Fix the Input GPIO polarity from HIGH to LOW.
> 
> previous version
> [0] https://patchwork.kernel.org/project/linux-amlogic/patch/20190113181808.5768-1-linux.amoon@gmail.com
> 
> changes fix the vbus-suppy to phy-supply, drop enable usb0
> 
>     USB_PWR                       2    1      0 unknown  5000mV     0mA  5000mV  5000mV
>        phy-c1108820.phy.0-phy     2                                 0mA     0mV     0mV
> ---
>  arch/arm/boot/dts/meson8b-odroidc1.dts | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
> index c440ef94e082..30ec6a7f20c7 100644
> --- a/arch/arm/boot/dts/meson8b-odroidc1.dts
> +++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
> @@ -32,6 +32,23 @@ emmc_pwrseq: emmc-pwrseq {
>  		reset-gpios = <&gpio BOOT_9 GPIO_ACTIVE_LOW>;
>  	};
>  
> +	usb_pwr_en: regulator-usb-pwr-en {
> +		compatible = "regulator-fixed";
> +
> +		regulator-name = "USB_OTG_PWR";
> +
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		/*
> +		 * signal name from schematics: USB_POWER - P5V0
> +		 */
> +		vin-supply = <&p5v0>;
> +		/*
> +		 * signal name from schematics: PWREN - GPIOAO.BIT5
> +		 */
> +		gpios = <&gpio_ao GPIOAO_5 GPIO_ACTIVE_LOW>;
> +	};
> +
>  	leds {
>  		compatible = "gpio-leds";
>  		blue {
> @@ -119,7 +136,6 @@ vcc_3v3: regulator-vcc-3v3 {
>  		regulator-name = "VCC3V3";
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
> -
>  		vin-supply = <&p5v0>;

As martin said, only a single functional change per patch please, this line removal should go in another patch.

>  	};
>  
> @@ -382,4 +398,5 @@ &usb1_phy {
>  
>  &usb1 {
>  	status = "okay";
> +	vbus-supply = <&usb_pwr_en>;
>  };
>