From: Lucas Stach <l.stach@pengutronix.de>
To: Robin Gong <yibin.gong@nxp.com>,
Oleksij Rempel <o.rempel@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>, Mark Brown <broonie@kernel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
dl-linux-imx <linux-imx@nxp.com>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"A.s. Dong" <aisheng.dong@nxp.com>,
Fabio Estevam <fabio.estevam@nxp.com>,
Russell King <linux@armlinux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Leonard Crestez <leonard.crestez@nxp.com>,
"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v8 1/6] ARM: imx6q: provide documentation for new fsl,pmic-stby-poweroff property
Date: Fri, 27 Jul 2018 10:30:11 +0200 [thread overview]
Message-ID: <1532680211.32306.36.camel@pengutronix.de> (raw)
In-Reply-To: <DB6PR04MB32236EA307DCD070771B1D4D892A0@DB6PR04MB3223.eurprd04.prod.outlook.com>
Hi Robin,
Am Freitag, den 27.07.2018, 01:51 +0000 schrieb Robin Gong:
[...]
> > > > ---
> > > > Documentation/devicetree/bindings/clock/imx6q-clock.txt | 8 ++++++++
> > > > 1 file changed, 8 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/clock/imx6q-clock.txt
> > > > b/Documentation/devicetree/bindings/clock/imx6q-clock.txt
> > > > index a45ca67a9d5f..e1308346e00d 100644
> > > > --- a/Documentation/devicetree/bindings/clock/imx6q-clock.txt
> > > > +++ b/Documentation/devicetree/bindings/clock/imx6q-clock.txt
> > > > @@ -6,6 +6,14 @@ Required properties:
> > > > - interrupts: Should contain CCM interrupt
> > > > - #clock-cells: Should be <1>
> > > >
> > > > +Optional properties:
> > > > +- fsl,pmic-stby-poweroff: Configure CCM to assert PMIC_STBY_REQ
> > > > +signal
> > > > + on power off.
> > > > + Use this property if the SoC should be powered off by external
> > > > +power
> > > > + management IC (PMIC) triggered via PMIC_STBY_REQ signal.
> > >
> > > PMIC_ON_REQ didn't connect to any pin of PMIC in your case?
> >
> > No. First, it was only one customer specific issue. After some research I found
> > even publicly available boards (for example RioTboard) which has same/similar
> > design. After seeing this in imx6 documentation as valid power off way, I have
> > no doubts - there should be even more devices doin this in the wild.
>
> Not sure why the customer didn't follow reference design, since PMIC_ON_REQ can
> provide power off/on feature by pressing ONOFF key which connected ONOFF
> pin of i.mx6(ONOFF will toggle PMIC_ON_REQ to power off/on PMIC). The official
> power off/on way (PMIC_ON_REQ) can also power off all power rails of PFUZE except
> snvs as your patch did on PMIC_STBY_REQ. PMIC_STBY_REQ is used to notify pmic
> switch power mode (PFM/APS) or decrease voltage to save power in kernel suspend,
> not power off....I am not sure if we need this patchset to 'workaround' the board issue.
>
Not all boards follow the reference design, that's a fact of life.
Please look at the i.MX6Q reference manual. The sequence implemented in
this patchset can be found as a valid way to power off the system in
"60.4.3 Power mode transitions" "Normal ON to OFF with external PMIC",
so there is hardly any way to argue that this is a board specific
quirk. This is one of the Freescale/NXP recommended sequences to turn
off the system.
Regards,
Lucas
next prev parent reply other threads:[~2018-07-27 8:30 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-26 9:22 [PATCH v8 0/6] provide power off support for iMX6 with external PMIC Oleksij Rempel
2018-07-26 9:22 ` [PATCH v8 1/6] ARM: imx6q: provide documentation for new fsl,pmic-stby-poweroff property Oleksij Rempel
2018-07-26 9:51 ` Robin Gong
2018-07-26 11:37 ` Oleksij Rempel
2018-07-27 1:51 ` Robin Gong
2018-07-27 8:30 ` Lucas Stach [this message]
2018-07-27 8:58 ` Robin Gong
2018-07-27 9:06 ` Oleksij Rempel
2018-07-30 8:03 ` Oleksij Rempel
2018-08-06 2:34 ` Robin Gong
2018-08-06 16:49 ` Lucas Stach
2018-07-27 8:41 ` Oleksij Rempel
2018-07-26 9:22 ` [PATCH v8 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set Oleksij Rempel
2018-07-27 9:15 ` Robin Gong
2018-07-30 7:57 ` Oleksij Rempel
2018-07-26 9:22 ` [PATCH v8 3/6] kernel/reboot.c: export pm_power_off_prepare Oleksij Rempel
2018-07-26 9:22 ` [PATCH v8 4/6] regulator: pfuze100: add fsl,pmic-stby-poweroff property Oleksij Rempel
2018-07-26 9:22 ` [PATCH v8 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler Oleksij Rempel
2018-07-27 9:32 ` Robin Gong
2018-07-30 7:50 ` Oleksij Rempel
2018-07-30 10:24 ` Mark Brown
2018-08-02 8:11 ` Oleksij Rempel
2018-08-02 8:16 ` Oleksij Rempel
2018-08-06 2:51 ` Robin Gong
2018-07-26 9:22 ` [PATCH v8 6/6] ARM: dts: imx6: RIoTboard provide standby on power off option Oleksij Rempel
2018-07-27 9:33 ` Robin Gong
2018-07-30 7:58 ` Oleksij Rempel
2018-08-02 8:37 ` Oleksij Rempel
2018-07-26 9:48 ` [PATCH v8 0/6] provide power off support for iMX6 with external PMIC Stefan Wahren
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