linux-kernel - Re: [PATCH] ARM: dts: imx6qdl-udoo: add support for powering off

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Message-ID: <20171129143946.GO9376@dragon>
Date:   Wed, 29 Nov 2017 22:39:47 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: imx6qdl-udoo: add support for powering off

On Mon, Nov 27, 2017 at 11:22:28PM +0100, Maciej S. Szmigiero wrote:
> UDOO board has a possibility to disable most of imx6 SoC power supplies via
> "EN_5V" signal, which is connected to "NANDF_D4" pad.
> 
> This reduces current consumption after shutdown from ~350 mA to ~40 mA and
> prevents a SoC watchdog from starting it again on its own after the
> watchdog timeout expires (previously it was not possible to shut down the
> SoC permanently if its watchdog was ever enabled since it was still ticking
> after the shutdown).
> 
> Unfortunately, this does not extinguish the "Power" LED (as it is powered
> from an always-on voltage regulator).
> 
> To power the SoC up again press the power button (SW2, the one with a long
> shaft).
> 
> Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>

Applied, thanks.