linux-kernel - Re: [PATCH 4/8] arm64: dts: imx8mm-kontron: Fix reg_rst_eth2 and reg_vdd

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Date:   Tue, 5 Oct 2021 15:09:49 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Frieder Schrempf <frieder@...s.de>
Cc:     devicetree@...r.kernel.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>, stable@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 4/8] arm64: dts: imx8mm-kontron: Fix reg_rst_eth2 and
 reg_vdd_5v regulators

On Thu, Sep 30, 2021 at 05:56:27PM +0200, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> The regulator reg_vdd_5v represents the fixed 5V supply on the board which
> can't be switched off. Mark it as always-on.
> 
> The regulator reg_rst_eth2 should keep the reset signal of the USB ethernet
> adapter deassertet anytime. Fix the polarity and mark it as always-on.

It seems to be wrong from the beginning that the reset is modelled by a
regulator.

> 
> Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
> Cc: stable@...r.kernel.org
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
> index 62ba3bd08a0c..f2c8ccefd1bf 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
> @@ -70,7 +70,9 @@ reg_rst_eth2: regulator-rst-eth2 {
>  		regulator-name = "rst-usb-eth2";
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&pinctrl_usb_eth2>;
> -		gpio = <&gpio3 2 GPIO_ACTIVE_LOW>;
> +		gpio = <&gpio3 2 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +		regulator-always-on;
>  	};
>  
>  	reg_vdd_5v: regulator-5v {
> @@ -78,6 +80,7 @@ reg_vdd_5v: regulator-5v {
>  		regulator-name = "vdd-5v";
>  		regulator-min-microvolt = <5000000>;
>  		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;

You do not have any on/off control over the regulator.  So how does this
always-on property make any difference?

Shawn

>  	};
>  };
>  
> -- 
> 2.33.0
>