On Fri, Jul 27, 2018 at 01:51:35AM +0000, Robin Gong wrote: > > > > -----Original Message----- > > From: Oleksij Rempel [mailto:o.rem...@pengutronix.de] > > Sent: 2018年7月26日 19:38 > > To: Robin Gong <yibin.g...@nxp.com>; Shawn Guo <shawn...@kernel.org>; > > Mark Brown <broo...@kernel.org>; Rafael J. Wysocki > > <rafael.j.wyso...@intel.com> > > Cc: ker...@pengutronix.de; devicet...@vger.kernel.org; > > linux-arm-ker...@lists.infradead.org; linux-...@vger.kernel.org; > > linux-kernel@vger.kernel.org; Andrew Morton <a...@linux-foundation.org>; > > Liam Girdwood <lgirdw...@gmail.com>; Leonard Crestez > > <leonard.cres...@nxp.com>; Rob Herring <robh...@kernel.org>; Mark > > Rutland <mark.rutl...@arm.com>; Michael Turquette > > <mturque...@baylibre.com>; Stephen Boyd <sb...@codeaurora.org>; Fabio > > Estevam <fabio.este...@nxp.com>; Russell King <li...@armlinux.org.uk>; > > dl-linux-imx <linux-...@nxp.com>; A.s. Dong <aisheng.d...@nxp.com> > > Subject: Re: [PATCH v8 1/6] ARM: imx6q: provide documentation for new > > fsl,pmic-stby-poweroff property > > > > Hi, > > > > On 26.07.2018 11:51, Robin Gong wrote: > > > > > > > > >> -----Original Message----- > > >> From: Oleksij Rempel [mailto:o.rem...@pengutronix.de] > > >> Sent: 2018年7月26日 17:22 > > >> To: Shawn Guo <shawn...@kernel.org>; Mark Brown > > <broo...@kernel.org>; > > >> Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > >> Cc: Oleksij Rempel <o.rem...@pengutronix.de>; ker...@pengutronix.de; > > >> devicet...@vger.kernel.org; linux-arm-ker...@lists.infradead.org; > > >> linux-...@vger.kernel.org; linux-kernel@vger.kernel.org; Andrew > > >> Morton <a...@linux-foundation.org>; Liam Girdwood > > >> <lgirdw...@gmail.com>; Leonard Crestez <leonard.cres...@nxp.com>; > > Rob > > >> Herring <robh...@kernel.org>; Mark Rutland <mark.rutl...@arm.com>; > > >> Michael Turquette <mturque...@baylibre.com>; Stephen Boyd > > >> <sb...@codeaurora.org>; Fabio Estevam <fabio.este...@nxp.com>; > > >> Russell King <li...@armlinux.org.uk>; dl-linux-imx > > >> <linux-...@nxp.com>; Robin Gong <yibin.g...@nxp.com>; A.s. Dong > > >> <aisheng.d...@nxp.com> > > >> Subject: [PATCH v8 1/6] ARM: imx6q: provide documentation for new > > >> fsl,pmic-stby-poweroff property > > >> > > >> Signed-off-by: Oleksij Rempel <o.rem...@pengutronix.de> > > >> Acked-by: Rob Herring <r...@kernel.org> > > >> --- > > >> 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. > > > > > Don't understand > > > why not follow normal board design guide to power off pmic by > > PMIC_ON_REQ. > > > How to power on board again then? > > > > Power cycle. Without this patch, power of is not real power off. So, power > > cycle, > > is expected behavior for user interaction. On usual PC, reset button will > > not > > enable PC as well. > Your board can't support wakeup by RTC alarm if not use PMIC_ON_REQ to power > off. > Again, why your board not follow the design guide?
Just wild assumption: you haven't read comment provided in patch: Subject: [PATCH v8 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set 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. -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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