linux-kernel - Re: [PATCH 8/8] arm64: dts: imx8mm-kontron: Leave reg_vdd

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Date:   Tue, 5 Oct 2021 15:27:24 +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>,
        Heiko Thiery <heiko.thiery@...il.com>, stable@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 8/8] arm64: dts: imx8mm-kontron: Leave reg_vdd_arm always
 powered on

On Thu, Sep 30, 2021 at 05:56:31PM +0200, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> When the cpufreq driver is enabled, the buck2 regulator is kept powered on
> by the dependency between the CPU nodes with 'cpu-supply' set. Without the
> cpufreq driver the kernel will power off the regulator as it doesn't see
> any users. This is obviously not what we want, therefore keep the regulator
> powered on in any case.
> 
> Reported-by: Heiko Thiery <heiko.thiery@...il.com>
> 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>

Already picked up the one from Heiko.

https://lore.kernel.org/all/20210915120325.20248-1-heiko.thiery@gmail.com/

Shawn

> ---
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> index 213014f59b46..c3418d263eb4 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> @@ -105,6 +105,7 @@ reg_vdd_arm: BUCK2 {
>  				regulator-min-microvolt = <850000>;
>  				regulator-max-microvolt = <950000>;
>  				regulator-boot-on;
> +				regulator-always-on;
>  				regulator-ramp-delay = <3125>;
>  				nxp,dvs-run-voltage = <950000>;
>  				nxp,dvs-standby-voltage = <850000>;
> -- 
> 2.33.0
>