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    Subject[PATCH 4.9 057/222] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set
    Date
    From: Oleksij Rempel <o.rempel@pengutronix.de>

    [ 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: Oleksij Rempel <o.rempel@pengutronix.de>
    Signed-off-by: Shawn Guo <shawnguo@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 1515e498d348c..dd9eb3f14f45c 100644
    --- a/arch/arm/mach-imx/pm-imx6.c
    +++ b/arch/arm/mach-imx/pm-imx6.c
    @@ -602,6 +602,28 @@ 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;
    @@ -618,6 +640,9 @@ 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)
    --
    2.20.1


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