linux-kernel - Re: [PATCH v2] ARM: dts: sun8i: Open FETA40i-C regulator aldo1

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Date: Tue, 09 Jan 2024 21:21:13 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Andre Przywara <andre.przywara@....com>,
 Florian Fainelli <f.fainelli@...il.com>, Wei Xu <xuwei5@...ilicon.com>,
 Gregory CLEMENT <gregory.clement@...tlin.com>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
 linux-kernel@...r.kernel.org,
 麦健建 <maijianzhang@...winnertech.com>
Subject: Re: [PATCH v2] ARM: dts: sun8i: Open FETA40i-C regulator aldo1

Dne torek, 26. december 2023 ob 09:40:05 CET je Fuyao Kashizuku napisal(a):
> The USB PHY in the Allwinner R40 SoC seems to rely on voltage on the
> VCC-TVIN/OUT supply pins for proper operation, on top of its own supply
> voltage on VCC-USB. Without a 3.3V voltage supplied to VCC-TV*, USB
> operation becomes unstable and can result in disconnects.
> 
> The Forlinx FETA40i-C SoM connects both the VCC-TVOUT and VCC-TVIN pins
> to the ALDO1 rail of the PMIC, so we need to enable that rail for USB
> operation. Since there is no supply property in the DT bindings for
> the USB core, we need to always enable the regulator.
> 
> This fixes unstable USB operation on boards using the Forlinx FETA40i-C
> module.
> 
> Signed-off-by: Fuyao Kashizuku <fuyao@...erm.com>

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
> Changes in v2:
>  - Subject include board name.
>  - regulator name changed to vcc-3v3-tv-usb.
>  - explain why we need to enable the regulator.
>  - use full name of the commiter
>  - Link to v1: https://lore.kernel.org/lkml/ZYKjYypuAx7gNuam@debian.cyg/
> 
>  arch/arm/boot/dts/allwinner/sun8i-r40-feta40i.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/allwinner/sun8i-r40-feta40i.dtsi b/arch/arm/boot/dts/allwinner/sun8i-r40-feta40i.dtsi
> index 9f39b5a2bb35..c12361d0317f 100644
> --- a/arch/arm/boot/dts/allwinner/sun8i-r40-feta40i.dtsi
> +++ b/arch/arm/boot/dts/allwinner/sun8i-r40-feta40i.dtsi
> @@ -42,6 +42,13 @@ &pio {
>  	vcc-pg-supply = <&reg_dldo1>;
>  };
>  
> +&reg_aldo1 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <3300000>;
> +	regulator-max-microvolt = <3300000>;
> +	regulator-name = "vcc-3v3-tv-usb";
> +};
> +
>  &reg_aldo2 {
>  	regulator-always-on;
>  	regulator-min-microvolt = <1800000>;
>