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Commit ac892349 authored by Oleksij Rempel's avatar Oleksij Rempel Committed by Greg Kroah-Hartman
Browse files

ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set 

[ Upstream commit 8148d2136002da2e2887caf6a07bbd9c033f14f3 ]

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: default avatarOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 86d5ceae

arch/arm/mach-imx/pm-imx6.c

+25 −0
Original line number Diff line number Diff line
@@ -618,6 +618,28 @@ 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;
@@ -634,6 +656,9 @@ 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)