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| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2018-08-02 12:34:21 +0200 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2018-09-12 09:10:43 +0800 |
| commit | 8148d2136002da2e2887caf6a07bbd9c033f14f3 (patch) | |
| tree | 33b725ef68e939b0ea3fd57222af6ce3b91f29a0 | |
| parent | 9454a0caff6ac6d2a5ea17dd624dc13387bbfcd3 (diff) | |
| download | linux-8148d2136002da2e2887caf6a07bbd9c033f14f3.tar.bz2 | |
ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set
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>
| -rw-r--r-- | arch/arm/mach-imx/pm-imx6.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c index b08e407d8d96..529f4b5bbd3a 100644 --- a/arch/arm/mach-imx/pm-imx6.c +++ b/arch/arm/mach-imx/pm-imx6.c @@ -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) |