linux-kernel - Re: [PATCH 4.19 182/422] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set

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Date:   Tue, 19 Nov 2019 21:19:45 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 182/422] ARM: imx6: register pm_power_off handler if
 "fsl,pmic-stby-poweroff" is set

Hi!

> From: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> [ Upstream commit 8148d2136002da2e2887caf6a07bbd9c033f14f3 ]
> 
> One of the Freescale recommended sequences for power off with external
> PMIC is the following:
> ...
> 3.  SoC is programming PMIC for power off when standby is asserted.
> 4.  In CCM STOP mode, Standby is asserted, PMIC gates SoC supplies.
> 
> See:
> http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6DQRM.pdf
> page 5083
> 
> This patch implements step 4. of this sequence.


> +	if (of_property_read_bool(np, "fsl,pmic-stby-poweroff"))
> +		imx6_pm_stby_poweroff_probe();
>  }

This is only active when fsl,pmic-stby-poweroff is present somewhere
in the tree, and that is not the case for 4.19-stable AFAICT. Is it
still good idea to have it stable branch?

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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