linux-kernel - Re: [PATCH v6 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set

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Date:   Wed, 9 May 2018 07:06:28 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, kernel@...gutronix.de,
        Fabio Estevam <fabio.estevam@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Leonard Crestez <leonard.crestez@....com>,
        Shawn Guo <shawnguo@...nel.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 2/6] ARM: imx6: register pm_power_off handler if
 "fsl,pmic-stby-poweroff" is set

On Tue, May 08, 2018 at 01:40:33PM +0100, Russell King - ARM Linux wrote:
> On Mon, Mar 05, 2018 at 11:25:19AM +0100, Oleksij Rempel wrote:
> > 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.
> > 
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > ---
> >  arch/arm/mach-imx/pm-imx6.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
> > index ecdf071653d4..24689260a2a5 100644
> > --- a/arch/arm/mach-imx/pm-imx6.c
> > +++ b/arch/arm/mach-imx/pm-imx6.c
> > @@ -604,6 +604,28 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata
> >  				   IMX6Q_GPR1_GINT);
> >  }
> >  
> > +static void imx6_pm_stby_poweroff(void)
> > +{
> > +	imx6_set_lpm(STOP_POWER_OFF);
> > +	cpu_suspend(0, imx6q_suspend_finish);
> 
> Do you actually need to save the processor state etc here - the request
> is after all to power down the system and not to suspend.  Would calling
> imx6q_suspend_finish() directly work (and hence simplify the code) ?

yes you right. This will work as well.
I'll send changed version after Rafaels feedback for kernel/reboot.c
part.
Russell, can I expect your Signed-off-by for changed patch?

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