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

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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>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Oleksij Rempel 2018-08-02 12:34:21 +02:00 committed by Shawn Guo
parent 9454a0caff
commit 8148d21360
1 changed files with 25 additions and 0 deletions
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25
arch/arm/mach-imx/pm-imx6.c
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@ -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)