[PATCH v7 0/6] provide power off support for iMX6 with external PMIC

[PATCH v7 0/6] provide power off support for iMX6 with external PMIC

[Oleksij Rempel]

2018.05.17:
update patches to version v7


This patch series is providing power off support for Freescale/NXP iMX6 based
boards with external power management integrated circuit (PMIC).
As a first step the PMIC is configured to turn off the system if the
standby pin is asserted. On second step we assert the standby pin.
For this reason we need to use pm_power_off_prepare.

Usage of stnadby pin for power off is described in official iMX6
documentation.

2018.03.05:
As this patch set touches multiple subsystems I think it would make
sense for Shawn Guo to take the all patch set.
The only part which didn't receive an ACK is regulator stuff. So I would
hope that Mark Brown can ACK it.

Kind regards,
Oleksij Rempel

2017.12.06:
Adding Linus. Probably there is no maintainer for this patch set.
No changes are made, tested on v4.15-rc1.

2017.10.27:
Last version of this patch set was send at 20 Jun 2017, this is a rebase against
kernel v4.14-rc6. Probably this set got lost. If I forgot to address some comments,
please point me.

changes:
v7:
 - use EXPORT_SYMBOL_GPL(pm_power_off_prepare) instead of EXPORT_SYMBOL
 - call imx6q_suspend_finish() directly without cpu_suspend()

v6:
 - rename imx6_pm_poweroff to imx6_pm_stby_poweroff
 - fix "MPIC_STBY_REQ" typo in the comment.

v5:
 - remove useless includes from pm-imx6.c patch
 - add Acked-by to "regulator: pfuze100: add fsl,pmic-stby-poweroff property"
   patch

v4:
 - update comment in "regulator: pfuze100: add fsl,pmic-stby-poweroff ..."
   patch
 - add Acked-by to "ARM: imx6q: provide documentation for new ..."
   patch

v3:
 - set pm_power_off_prepare = NULL on .remove.
 - documentation and spelling fixes.
 - use %pf instead of lookup_symbol_name.

Oleksij Rempel (6):
  ARM: imx6q: provide documentation for new fsl,pmic-stby-poweroff
    property
  ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff"
    is set
  kernel/reboot.c: export pm_power_off_prepare
  regulator: pfuze100: add fsl,pmic-stby-poweroff property
  regulator: pfuze100-regulator: provide pm_power_off_prepare handler
  ARM: dts: imx6: RIoTboard provide standby on power off option

 .../devicetree/bindings/clock/imx6q-clock.txt |  8 ++
 .../bindings/regulator/pfuze100.txt           |  7 ++
 arch/arm/boot/dts/imx6dl-riotboard.dts        |  5 +
 arch/arm/mach-imx/pm-imx6.c                   | 25 +++++
 drivers/regulator/pfuze100-regulator.c        | 92 +++++++++++++++++++
 kernel/reboot.c                               |  1 +
 6 files changed, 138 insertions(+)

-- 
2.17.0

[PATCH v7 1/6] ARM: imx6q: provide documentation for new fsl, pmic-stby-poweroff property

[Oleksij Rempel]

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Rob Herring <robh@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.
+  Boards that are designed to initiate poweroff on PMIC_ON_REQ signal should
+  be using "syscon-poweroff" driver instead.
+
 The clock consumer should specify the desired clock by having the clock
 ID in its "clocks" phandle cell.  See include/dt-bindings/clock/imx6qdl-clock.h
 for the full list of i.MX6 Quad and DualLite clock IDs.
-- 
2.17.0

[PATCH v7 2/6] ARM: imx6: register pm_power_off handler if "fsl, pmic-stby-poweroff" is set

[Oleksij Rempel]

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@pengutronix.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 017539dd712b..2f5c643f62fb 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -601,6 +601,28 @@ 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);
+	imx6q_suspend_finish(0);
+
+	mdelay(1000);
+
+	pr_emerg("Unable to poweroff system\n");
+}
+
+static int imx6_pm_stby_poweroff_probe(void)
+{
+	if (pm_power_off) {
+		pr_warn("%s: pm_power_off already claimed  %p %pf!\n",
+			__func__, pm_power_off, pm_power_off);
+		return -EBUSY;
+	}
+
+	pm_power_off = imx6_pm_stby_poweroff;
+	return 0;
+}
+
 void __init imx6_pm_ccm_init(const char *ccm_compat)
 {
 	struct device_node *np;
@@ -617,6 +639,9 @@ void __init imx6_pm_ccm_init(const char *ccm_compat)
 	val = readl_relaxed(ccm_base + CLPCR);
 	val &= ~BM_CLPCR_LPM;
 	writel_relaxed(val, ccm_base + CLPCR);
+
+	if (of_property_read_bool(np, "fsl,pmic-stby-poweroff"))
+		imx6_pm_stby_poweroff_probe();
 }
 
 void __init imx6q_pm_init(void)
-- 
2.17.0

[PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare

[Oleksij Rempel]

Export pm_power_off_prepare. It is needed to implement power off on
Freescale/NXP iMX6 based boards with external power management
integrated circuit (PMIC).

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 kernel/reboot.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/reboot.c b/kernel/reboot.c
index e4ced883d8de..83810d726f3e 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -49,6 +49,7 @@ int reboot_force;
  */
 
 void (*pm_power_off_prepare)(void);
+EXPORT_SYMBOL_GPL(pm_power_off_prepare);
 
 /**
  *	emergency_restart - reboot the system
-- 
2.17.0

[PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare

[Oleksij Rempel]

Hi Rafael,

Last version of this patch was send at 17.05.2018. No other comment was
provided and this patch is a blocker for other patches in this serie.
Can you please give some feedback on it.

On 17.05.2018 07:50, Oleksij Rempel wrote:
> Export pm_power_off_prepare. It is needed to implement power off on
> Freescale/NXP iMX6 based boards with external power management
> integrated circuit (PMIC).
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  kernel/reboot.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index e4ced883d8de..83810d726f3e 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -49,6 +49,7 @@ int reboot_force;
>   */
>  
>  void (*pm_power_off_prepare)(void);
> +EXPORT_SYMBOL_GPL(pm_power_off_prepare);
>  
>  /**
>   *	emergency_restart - reboot the system
> 

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[PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare

[Rafael J. Wysocki]

On Tuesday, June 12, 2018 2:42:12 PM CEST Oleksij Rempel wrote:
>  This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
> --Sj2PRcQlY7eZybdA0sq9wWzJEO8fKS924
> Content-Type: multipart/mixed; boundary="d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg";
>  protected-headers="v1"
> From: Oleksij Rempel <o.rempel@pengutronix.de>
> To: Shawn Guo <shawnguo@kernel.org>, Mark Brown <broonie@kernel.org>,
>  "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> Cc: kernel at pengutronix.de, devicetree at vger.kernel.org,
>  linux-arm-kernel at lists.infradead.org, linux-clk at vger.kernel.org,
>  linux-kernel at vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
>  Liam Girdwood <lgirdwood@gmail.com>,
>  Leonard Crestez <leonard.crestez@nxp.com>, Rob Herring <robh+dt@kernel.org>,
>  Mark Rutland <mark.rutland@arm.com>,
>  Michael Turquette <mturquette@baylibre.com>,
>  Stephen Boyd <sboyd@codeaurora.org>, Fabio Estevam <fabio.estevam@nxp.com>,
>  Russell King <linux@armlinux.org.uk>
> Message-ID: <daba73df-037c-2583-3a08-f3f27c4129d1@pengutronix.de>
> Subject: Re: [PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare
> References: <20180517055014.6607-1-o.rempel@pengutronix.de>
>  <20180517055014.6607-4-o.rempel@pengutronix.de>
> In-Reply-To: <20180517055014.6607-4-o.rempel@pengutronix.de>
> 
> --d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg
> Content-Type: text/plain; charset=utf-8
> Content-Language: en-US
> Content-Transfer-Encoding: quoted-printable
> 
> Hi Rafael,
> 
> Last version of this patch was send at 17.05.2018. No other comment was
> provided and this patch is a blocker for other patches in this serie.
> Can you please give some feedback on it.

I would have done that had I not missed the patch.

Which probably wouldn't have happened had you CCed it to linux-pm.

Anyway, I have no particular problems with exporting pm_power_off_prepare via
EXPORT_SYMBOL_GPL().

> 
> On 17.05.2018 07:50, Oleksij Rempel wrote:
> > Export pm_power_off_prepare. It is needed to implement power off on
> > Freescale/NXP iMX6 based boards with external power management
> > integrated circuit (PMIC).
> >=20
> > Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> > ---
> >  kernel/reboot.c | 1 +
> >  1 file changed, 1 insertion(+)
> >=20
> > diff --git a/kernel/reboot.c b/kernel/reboot.c
> > index e4ced883d8de..83810d726f3e 100644
> > --- a/kernel/reboot.c
> > +++ b/kernel/reboot.c
> > @@ -49,6 +49,7 @@ int reboot_force;
> >   */
> > =20
> >  void (*pm_power_off_prepare)(void);
> > +EXPORT_SYMBOL_GPL(pm_power_off_prepare);
> > =20
> >  /**
> >   *	emergency_restart - reboot the system
> >=20
> 
> 
> --d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg--
> 
> --Sj2PRcQlY7eZybdA0sq9wWzJEO8fKS924
> Content-Type: application/pgp-signature; name="signature.asc"
> Content-Description: OpenPGP digital signature
> Content-Disposition: attachment; filename="signature.asc"
> 
> 
> --Sj2PRcQlY7eZybdA0sq9wWzJEO8fKS924--
> 

[PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare

[Shawn Guo]

On Tue, Jun 12, 2018 at 04:33:05PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, June 12, 2018 2:42:12 PM CEST Oleksij Rempel wrote:
> >  This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
> > --Sj2PRcQlY7eZybdA0sq9wWzJEO8fKS924
> > Content-Type: multipart/mixed; boundary="d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg";
> >  protected-headers="v1"
> > From: Oleksij Rempel <o.rempel@pengutronix.de>
> > To: Shawn Guo <shawnguo@kernel.org>, Mark Brown <broonie@kernel.org>,
> >  "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> > Cc: kernel at pengutronix.de, devicetree at vger.kernel.org,
> >  linux-arm-kernel at lists.infradead.org, linux-clk at vger.kernel.org,
> >  linux-kernel at vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
> >  Liam Girdwood <lgirdwood@gmail.com>,
> >  Leonard Crestez <leonard.crestez@nxp.com>, Rob Herring <robh+dt@kernel.org>,
> >  Mark Rutland <mark.rutland@arm.com>,
> >  Michael Turquette <mturquette@baylibre.com>,
> >  Stephen Boyd <sboyd@codeaurora.org>, Fabio Estevam <fabio.estevam@nxp.com>,
> >  Russell King <linux@armlinux.org.uk>
> > Message-ID: <daba73df-037c-2583-3a08-f3f27c4129d1@pengutronix.de>
> > Subject: Re: [PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare
> > References: <20180517055014.6607-1-o.rempel@pengutronix.de>
> >  <20180517055014.6607-4-o.rempel@pengutronix.de>
> > In-Reply-To: <20180517055014.6607-4-o.rempel@pengutronix.de>
> > 
> > --d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg
> > Content-Type: text/plain; charset=utf-8
> > Content-Language: en-US
> > Content-Transfer-Encoding: quoted-printable
> > 
> > Hi Rafael,
> > 
> > Last version of this patch was send at 17.05.2018. No other comment was
> > provided and this patch is a blocker for other patches in this serie.
> > Can you please give some feedback on it.
> 
> I would have done that had I not missed the patch.
> 
> Which probably wouldn't have happened had you CCed it to linux-pm.
> 
> Anyway, I have no particular problems with exporting pm_power_off_prepare via
> EXPORT_SYMBOL_GPL().

Rafael,

Can we have your explicit Acked-by tag on this patch?  Thanks.

Shawn

[PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare

[Oleksij Rempel]

Hi Rafael,

it is two weeks since this email. Probably it was lost some where in the
space time continuum.
Can you please respond to it :)

On 17.06.2018 09:05, Shawn Guo wrote:
> On Tue, Jun 12, 2018 at 04:33:05PM +0200, Rafael J. Wysocki wrote:
>> On Tuesday, June 12, 2018 2:42:12 PM CEST Oleksij Rempel wrote:
>>>  This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
>>> --Sj2PRcQlY7eZybdA0sq9wWzJEO8fKS924
>>> Content-Type: multipart/mixed; boundary="d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg";
>>>  protected-headers="v1"
>>> From: Oleksij Rempel <o.rempel@pengutronix.de>
>>> To: Shawn Guo <shawnguo@kernel.org>, Mark Brown <broonie@kernel.org>,
>>>  "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
>>> Cc: kernel at pengutronix.de, devicetree at vger.kernel.org,
>>>  linux-arm-kernel at lists.infradead.org, linux-clk at vger.kernel.org,
>>>  linux-kernel at vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
>>>  Liam Girdwood <lgirdwood@gmail.com>,
>>>  Leonard Crestez <leonard.crestez@nxp.com>, Rob Herring <robh+dt@kernel.org>,
>>>  Mark Rutland <mark.rutland@arm.com>,
>>>  Michael Turquette <mturquette@baylibre.com>,
>>>  Stephen Boyd <sboyd@codeaurora.org>, Fabio Estevam <fabio.estevam@nxp.com>,
>>>  Russell King <linux@armlinux.org.uk>
>>> Message-ID: <daba73df-037c-2583-3a08-f3f27c4129d1@pengutronix.de>
>>> Subject: Re: [PATCH v7 3/6] kernel/reboot.c: export pm_power_off_prepare
>>> References: <20180517055014.6607-1-o.rempel@pengutronix.de>
>>>  <20180517055014.6607-4-o.rempel@pengutronix.de>
>>> In-Reply-To: <20180517055014.6607-4-o.rempel@pengutronix.de>
>>>
>>> --d6BZYFRi4L3iCmOh3nm6wjii3dWC9QFDg
>>> Content-Type: text/plain; charset=utf-8
>>> Content-Language: en-US
>>> Content-Transfer-Encoding: quoted-printable
>>>
>>> Hi Rafael,
>>>
>>> Last version of this patch was send at 17.05.2018. No other comment was
>>> provided and this patch is a blocker for other patches in this serie.
>>> Can you please give some feedback on it.
>>
>> I would have done that had I not missed the patch.
>>
>> Which probably wouldn't have happened had you CCed it to linux-pm.
>>
>> Anyway, I have no particular problems with exporting pm_power_off_prepare via
>> EXPORT_SYMBOL_GPL().
> 
> Rafael,
> 
> Can we have your explicit Acked-by tag on this patch?  Thanks.
> 
> Shawn
> 

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[PATCH v7 4/6] regulator: pfuze100: add fsl, pmic-stby-poweroff property

[Oleksij Rempel]

Document the new optional "fsl,pmic-stby-poweroff" property.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/regulator/pfuze100.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
index c6dd3f5e485b..91fec1a0785d 100644
--- a/Documentation/devicetree/bindings/regulator/pfuze100.txt
+++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
@@ -4,6 +4,13 @@ Required properties:
 - compatible: "fsl,pfuze100", "fsl,pfuze200", "fsl,pfuze3000"
 - reg: I2C slave address
 
+Optional properties:
+- fsl,pmic-stby-poweroff: if present, configure the PMIC to shutdown all
+  power rails when PMIC_STBY_REQ line is asserted during the power off sequence.
+  Use this option if the SoC should be powered off by external power
+  management IC (PMIC) on PMIC_STBY_REQ signal.
+  As opposite to PMIC_STBY_REQ boards can implement PMIC_ON_REQ signal.
+
 Required child node:
 - regulators: This is the list of child nodes that specify the regulator
   initialization data for defined regulators. Please refer to below doc
-- 
2.17.0

[PATCH v7 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler

[Oleksij Rempel]

On some boards the SoC can use one pin "PMIC_STBY_REQ" to notify th PMIC
about state changes. In this case internal state of PMIC must be
preconfigured for upcomming state change.
It works fine with the current regulator framework, except with the
power-off case.

This patch is providing an optional pm_power_off_prepare handler
which will configure standby state of the PMIC to disable all power lines.

In my power consumption test on RIoTBoard, I got the following results:
power off without this patch:	320 mA
power off with this patch:	2   mA
suspend to ram:			40  mA

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/regulator/pfuze100-regulator.c | 92 ++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index 63922a2167e5..f6c276ed91d8 100644
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -28,6 +28,7 @@
 #include <linux/regulator/pfuze100.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/kallsyms.h>
 #include <linux/regmap.h>
 
 #define PFUZE_NUMREGS		128
@@ -42,11 +43,17 @@
 
 #define PFUZE100_COINVOL	0x1a
 #define PFUZE100_SW1ABVOL	0x20
+#define PFUZE100_SW1ABMODE	0x23
 #define PFUZE100_SW1CVOL	0x2e
+#define PFUZE100_SW1CMODE	0x31
 #define PFUZE100_SW2VOL		0x35
+#define PFUZE100_SW2MODE	0x38
 #define PFUZE100_SW3AVOL	0x3c
+#define PFUZE100_SW3AMODE	0x3f
 #define PFUZE100_SW3BVOL	0x43
+#define PFUZE100_SW3BMODE	0x46
 #define PFUZE100_SW4VOL		0x4a
+#define PFUZE100_SW4MODE	0x4d
 #define PFUZE100_SWBSTCON1	0x66
 #define PFUZE100_VREFDDRCON	0x6a
 #define PFUZE100_VSNVSVOL	0x6b
@@ -57,6 +64,13 @@
 #define PFUZE100_VGEN5VOL	0x70
 #define PFUZE100_VGEN6VOL	0x71
 
+#define PFUZE100_SWxMODE_MASK	0xf
+#define PFUZE100_SWxMODE_APS_APS	0x8
+#define PFUZE100_SWxMODE_APS_OFF	0x4
+
+#define PFUZE100_VGENxLPWR	BIT(6)
+#define PFUZE100_VGENxSTBY	BIT(5)
+
 enum chips { PFUZE100, PFUZE200, PFUZE3000 = 3 };
 
 struct pfuze_regulator {
@@ -489,6 +503,69 @@ static inline struct device_node *match_of_node(int index)
 }
 #endif
 
+static struct pfuze_chip *syspm_pfuze_chip;
+
+static void pfuze_power_off_prepare(void)
+{
+	dev_info(syspm_pfuze_chip->dev, "Configure standy mode for power off");
+
+	/* Switch from default mode: APS/APS to APS/Off */
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1ABMODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1CMODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW2MODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3AMODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3BMODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW4MODE,
+			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
+
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN1VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN2VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN3VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN4VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN5VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN6VOL,
+			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
+			   PFUZE100_VGENxSTBY);
+}
+
+static int pfuze_power_off_prepare_init(struct pfuze_chip *pfuze_chip)
+{
+	if (pfuze_chip->chip_id != PFUZE100) {
+		dev_warn(pfuze_chip->dev, "Requested pm_power_off_prepare handler for not supported chip\n");
+		return -ENODEV;
+	}
+
+	if (pm_power_off_prepare) {
+		dev_warn(pfuze_chip->dev, "pm_power_off_prepare is already registered.\n");
+		return -EBUSY;
+	}
+
+	if (syspm_pfuze_chip) {
+		dev_warn(pfuze_chip->dev, "syspm_pfuze_chip is already set.\n");
+		return -EBUSY;
+	}
+
+	syspm_pfuze_chip = pfuze_chip;
+	pm_power_off_prepare = pfuze_power_off_prepare;
+
+	return 0;
+}
+
 static int pfuze_identify(struct pfuze_chip *pfuze_chip)
 {
 	unsigned int value;
@@ -659,6 +736,20 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
 		}
 	}
 
+	if (of_property_read_bool(client->dev.of_node,
+				  "fsl,pmic-stby-poweroff"))
+		return pfuze_power_off_prepare_init(pfuze_chip);
+
+	return 0;
+}
+
+static int pfuze100_regulator_remove(struct i2c_client *client)
+{
+	if (syspm_pfuze_chip) {
+		syspm_pfuze_chip = NULL;
+		pm_power_off_prepare = NULL;
+	}
+
 	return 0;
 }
 
@@ -669,6 +760,7 @@ static struct i2c_driver pfuze_driver = {
 		.of_match_table = pfuze_dt_ids,
 	},
 	.probe = pfuze100_regulator_probe,
+	.remove = pfuze100_regulator_remove,
 };
 module_i2c_driver(pfuze_driver);
 
-- 
2.17.0

[PATCH v7 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler

[Oleksij Rempel]

Hi Mark,

Rob ACKed DT bindings, Rafael ACKed export of pm_power_off_prepare. I
need your OK for regulator patch.

On 17.05.2018 07:50, Oleksij Rempel wrote:
> On some boards the SoC can use one pin "PMIC_STBY_REQ" to notify th PMIC
> about state changes. In this case internal state of PMIC must be
> preconfigured for upcomming state change.
> It works fine with the current regulator framework, except with the
> power-off case.
> 
> This patch is providing an optional pm_power_off_prepare handler
> which will configure standby state of the PMIC to disable all power lines.
> 
> In my power consumption test on RIoTBoard, I got the following results:
> power off without this patch:	320 mA
> power off with this patch:	2   mA
> suspend to ram:			40  mA
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/regulator/pfuze100-regulator.c | 92 ++++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
> index 63922a2167e5..f6c276ed91d8 100644
> --- a/drivers/regulator/pfuze100-regulator.c
> +++ b/drivers/regulator/pfuze100-regulator.c
> @@ -28,6 +28,7 @@
>  #include <linux/regulator/pfuze100.h>
>  #include <linux/i2c.h>
>  #include <linux/slab.h>
> +#include <linux/kallsyms.h>
>  #include <linux/regmap.h>
>  
>  #define PFUZE_NUMREGS		128
> @@ -42,11 +43,17 @@
>  
>  #define PFUZE100_COINVOL	0x1a
>  #define PFUZE100_SW1ABVOL	0x20
> +#define PFUZE100_SW1ABMODE	0x23
>  #define PFUZE100_SW1CVOL	0x2e
> +#define PFUZE100_SW1CMODE	0x31
>  #define PFUZE100_SW2VOL		0x35
> +#define PFUZE100_SW2MODE	0x38
>  #define PFUZE100_SW3AVOL	0x3c
> +#define PFUZE100_SW3AMODE	0x3f
>  #define PFUZE100_SW3BVOL	0x43
> +#define PFUZE100_SW3BMODE	0x46
>  #define PFUZE100_SW4VOL		0x4a
> +#define PFUZE100_SW4MODE	0x4d
>  #define PFUZE100_SWBSTCON1	0x66
>  #define PFUZE100_VREFDDRCON	0x6a
>  #define PFUZE100_VSNVSVOL	0x6b
> @@ -57,6 +64,13 @@
>  #define PFUZE100_VGEN5VOL	0x70
>  #define PFUZE100_VGEN6VOL	0x71
>  
> +#define PFUZE100_SWxMODE_MASK	0xf
> +#define PFUZE100_SWxMODE_APS_APS	0x8
> +#define PFUZE100_SWxMODE_APS_OFF	0x4
> +
> +#define PFUZE100_VGENxLPWR	BIT(6)
> +#define PFUZE100_VGENxSTBY	BIT(5)
> +
>  enum chips { PFUZE100, PFUZE200, PFUZE3000 = 3 };
>  
>  struct pfuze_regulator {
> @@ -489,6 +503,69 @@ static inline struct device_node *match_of_node(int index)
>  }
>  #endif
>  
> +static struct pfuze_chip *syspm_pfuze_chip;
> +
> +static void pfuze_power_off_prepare(void)
> +{
> +	dev_info(syspm_pfuze_chip->dev, "Configure standy mode for power off");
> +
> +	/* Switch from default mode: APS/APS to APS/Off */
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1ABMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1CMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW2MODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3AMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3BMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW4MODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN1VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN2VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN3VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN4VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN5VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN6VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +}
> +
> +static int pfuze_power_off_prepare_init(struct pfuze_chip *pfuze_chip)
> +{
> +	if (pfuze_chip->chip_id != PFUZE100) {
> +		dev_warn(pfuze_chip->dev, "Requested pm_power_off_prepare handler for not supported chip\n");
> +		return -ENODEV;
> +	}
> +
> +	if (pm_power_off_prepare) {
> +		dev_warn(pfuze_chip->dev, "pm_power_off_prepare is already registered.\n");
> +		return -EBUSY;
> +	}
> +
> +	if (syspm_pfuze_chip) {
> +		dev_warn(pfuze_chip->dev, "syspm_pfuze_chip is already set.\n");
> +		return -EBUSY;
> +	}
> +
> +	syspm_pfuze_chip = pfuze_chip;
> +	pm_power_off_prepare = pfuze_power_off_prepare;
> +
> +	return 0;
> +}
> +
>  static int pfuze_identify(struct pfuze_chip *pfuze_chip)
>  {
>  	unsigned int value;
> @@ -659,6 +736,20 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
>  		}
>  	}
>  
> +	if (of_property_read_bool(client->dev.of_node,
> +				  "fsl,pmic-stby-poweroff"))
> +		return pfuze_power_off_prepare_init(pfuze_chip);
> +
> +	return 0;
> +}
> +
> +static int pfuze100_regulator_remove(struct i2c_client *client)
> +{
> +	if (syspm_pfuze_chip) {
> +		syspm_pfuze_chip = NULL;
> +		pm_power_off_prepare = NULL;
> +	}
> +
>  	return 0;
>  }
>  
> @@ -669,6 +760,7 @@ static struct i2c_driver pfuze_driver = {
>  		.of_match_table = pfuze_dt_ids,
>  	},
>  	.probe = pfuze100_regulator_probe,
> +	.remove = pfuze100_regulator_remove,
>  };
>  module_i2c_driver(pfuze_driver);
>  
> 

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[PATCH v7 6/6] ARM: dts: imx6: RIoTboard provide standby on power off option

[Oleksij Rempel]

This board, as well as some other boards with i.MX6 and a PMIC, uses a
"PMIC_STBY_REQ" line to notify the PMIC about a state change.
The PMIC is programmed for a specific state change before triggering the
line.
In this case, PMIC_STBY_REQ can be used for stand by, sleep
and power off modes.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/arm/boot/dts/imx6dl-riotboard.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/imx6dl-riotboard.dts b/arch/arm/boot/dts/imx6dl-riotboard.dts
index 2e98c92adff7..a0e9753ee767 100644
--- a/arch/arm/boot/dts/imx6dl-riotboard.dts
+++ b/arch/arm/boot/dts/imx6dl-riotboard.dts
@@ -90,6 +90,10 @@
 	status = "okay";
 };
 
+&clks {
+	fsl,pmic-stby-poweroff;
+};
+
 &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
@@ -170,6 +174,7 @@
 		reg = <0x08>;
 		interrupt-parent = <&gpio5>;
 		interrupts = <16 8>;
+		fsl,pmic-stby-poweroff;
 
 		regulators {
 			reg_vddcore: sw1ab {				/* VDDARM_IN */
-- 
2.17.0