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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: Oleksij Rempel <o.rempel@pengutronix.de>,
	kernel@pengutronix.de, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org,
	linux-kernel@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>,
	linux-imx@nxp.com, yibin.gong@nxp.com,
	"A.s. Dong" <aisheng.dong@nxp.com>
Subject: [PATCH v9 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set
Date: Thu,  2 Aug 2018 12:34:21 +0200	[thread overview]
Message-ID: <20180802103425.3053-3-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20180802103425.3053-1-o.rempel@pengutronix.de>

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)
-- 
2.18.0


WARNING: multiple messages have this Message-ID (diff)
From: o.rempel@pengutronix.de (Oleksij Rempel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 2/6] ARM: imx6: register pm_power_off handler if "fsl, pmic-stby-poweroff" is set
Date: Thu,  2 Aug 2018 12:34:21 +0200	[thread overview]
Message-ID: <20180802103425.3053-3-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20180802103425.3053-1-o.rempel@pengutronix.de>

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)
-- 
2.18.0

  parent reply	other threads:[~2018-08-02 10:34 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-02 10:34 [PATCH v9 0/6] provide power off support for iMX6 with external PMIC Oleksij Rempel
2018-08-02 10:34 ` Oleksij Rempel
2018-08-02 10:34 ` [PATCH v9 1/6] ARM: imx6q: provide documentation for new fsl,pmic-stby-poweroff property Oleksij Rempel
2018-08-02 10:34   ` [PATCH v9 1/6] ARM: imx6q: provide documentation for new fsl, pmic-stby-poweroff property Oleksij Rempel
2018-09-12  1:04   ` [PATCH v9 1/6] ARM: imx6q: provide documentation for new fsl,pmic-stby-poweroff property Shawn Guo
2018-09-12  1:04     ` Shawn Guo
2018-08-02 10:34 ` Oleksij Rempel [this message]
2018-08-02 10:34   ` [PATCH v9 2/6] ARM: imx6: register pm_power_off handler if "fsl, pmic-stby-poweroff" is set Oleksij Rempel
2018-09-12  1:10   ` [PATCH v9 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" " Shawn Guo
2018-09-12  1:10     ` Shawn Guo
2018-08-02 10:34 ` [PATCH v9 3/6] kernel/reboot.c: export pm_power_off_prepare Oleksij Rempel
2018-08-02 10:34   ` Oleksij Rempel
2018-08-02 10:44   ` Mark Brown
2018-08-02 10:44     ` Mark Brown
2018-08-02 10:44     ` Mark Brown
2018-08-02 10:47     ` Oleksij Rempel
2018-08-02 10:47       ` Oleksij Rempel
2018-08-02 11:35       ` Mark Brown
2018-08-02 11:35         ` Mark Brown
2018-08-27  1:48         ` Shawn Guo
2018-08-27  1:48           ` Shawn Guo
2018-09-06 10:15           ` Mark Brown
2018-09-06 10:15             ` Mark Brown
2018-09-07  7:35             ` Oleksij Rempel
2018-09-07  7:35               ` Oleksij Rempel
2018-09-09  2:00             ` Shawn Guo
2018-09-09  2:00               ` Shawn Guo
2018-09-09  2:00               ` Shawn Guo
2018-09-10 15:19               ` Mark Brown
2018-09-10 15:19                 ` Mark Brown
2018-09-11  1:53                 ` Shawn Guo
2018-09-11  1:53                   ` Shawn Guo
2018-09-11  4:36                   ` Oleksij Rempel
2018-09-11  4:36                     ` Oleksij Rempel
2018-09-11  4:36                     ` Oleksij Rempel
2018-09-11 15:19                   ` Mark Brown
2018-09-11 15:19                     ` Mark Brown
2018-08-02 10:34 ` [PATCH v9 4/6] regulator: pfuze100: add fsl,pmic-stby-poweroff property Oleksij Rempel
2018-08-02 10:34   ` [PATCH v9 4/6] regulator: pfuze100: add fsl, pmic-stby-poweroff property Oleksij Rempel
2018-08-02 10:34 ` [PATCH v9 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler Oleksij Rempel
2018-08-02 10:34   ` Oleksij Rempel
2018-08-02 10:34   ` Oleksij Rempel
2018-08-02 10:34 ` [PATCH v9 6/6] ARM: dts: imx6: RIoTboard provide standby on power off option Oleksij Rempel
2018-08-02 10:34   ` Oleksij Rempel
2018-09-12  1:11   ` Shawn Guo
2018-09-12  1:11     ` Shawn Guo

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