linux-kernel - Re: [PATCH v3 09/11] ARM: dts: imx6ul-kontron-n6x1x-s: Disable the snvs-poweroff driver

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Message-ID: <20191104074346.GT24620@dragon>
Date:   Mon, 4 Nov 2019 15:43:47 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 09/11] ARM: dts: imx6ul-kontron-n6x1x-s: Disable the
 snvs-poweroff driver

On Thu, Oct 31, 2019 at 02:24:27PM +0000, Schrempf Frieder wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> The snvs-poweroff driver can power off the system by pulling the
> PMIC_ON_REQ signal low, to let the PMIC disable the power.
> The Kontron SoMs do not have this signal connected, so let's remove
> the node.
> 
> This seems to fix a real issue when the signal is asserted at
> poweroff, but not actually causing the power to turn off. It was
> observed, that in this case the system would not shut down properly.

I do not quite follow on this.  How does disabling snvs_poweroff fix the
issue?  The root cause of system not shut down properly seems to be that
PMIC doesn't shut down power.  This looks like a clean-up rather than
bug fix.

> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
> Fixes: 1ea4b76cdfde ("ARM: dts: imx6ul-kontron-n6310: Add Kontron i.MX6UL N6310 SoM and boards")

If you think this is really a bug fix, it should be applied to the file
before renaming rather than the one after renaming.

Shawn

> ---
>  arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi b/arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi
> index e18a8bd239be..4682a79f5b23 100644
> --- a/arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi
> +++ b/arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi
> @@ -158,10 +158,6 @@
>  	status = "okay";
>  };
>  
> -&snvs_poweroff {
> -	status = "okay";
> -};
> -
>  &uart1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_uart1>;
> -- 
> 2.17.1