From: shawnguo@kernel.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: imx6qdl-udoo: add support for powering off
Date: Wed, 29 Nov 2017 22:39:47 +0800 [thread overview]
Message-ID: <20171129143946.GO9376@dragon> (raw)
In-Reply-To: <475cb655-a88f-0cc2-2e00-405458f80433@maciej.szmigiero.name>
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@maciej.szmigiero.name>
Applied, thanks.
WARNING: multiple messages have this Message-ID (diff)
From: Shawn Guo <shawnguo@kernel.org>
To: "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc: Sascha Hauer <kernel@pengutronix.de>,
Fabio Estevam <fabio.estevam@nxp.com>,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ARM: dts: imx6qdl-udoo: add support for powering off
Date: Wed, 29 Nov 2017 22:39:47 +0800 [thread overview]
Message-ID: <20171129143946.GO9376@dragon> (raw)
In-Reply-To: <475cb655-a88f-0cc2-2e00-405458f80433@maciej.szmigiero.name>
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@maciej.szmigiero.name>
Applied, thanks.
next prev parent reply other threads:[~2017-11-29 14:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 22:22 [PATCH] ARM: dts: imx6qdl-udoo: add support for powering off Maciej S. Szmigiero
2017-11-27 22:22 ` Maciej S. Szmigiero
2017-11-29 14:39 ` Shawn Guo [this message]
2017-11-29 14:39 ` Shawn Guo
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