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 v8 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set
Date: Thu, 26 Jul 2018 11:22:16 +0200 [thread overview]
Message-ID: <20180726092220.17250-3-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20180726092220.17250-1-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
next prev parent reply other threads:[~2018-07-26 9:23 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
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 ` Oleksij Rempel [this message]
2018-07-27 9:15 ` [PATCH v8 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set 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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