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@xxxxxxxxxxxxxx> Cc: kernel@xxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: Michael Turquette <mturquette@xxxxxxxxxxxx> Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: linux-clk@xxxxxxxxxxxxxxx Cc: devicetree@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx --- arch/arm/mach-imx/pm-imx6.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c index e61b1d1027e1..fd7b95f340e5 100644 --- a/arch/arm/mach-imx/pm-imx6.c +++ b/arch/arm/mach-imx/pm-imx6.c @@ -27,6 +27,8 @@ #include <asm/proc-fns.h> #include <asm/suspend.h> #include <asm/tlb.h> +#include <linux/kallsyms.h> +#include <linux/regulator/machine.h> #include "common.h" #include "hardware.h" @@ -602,6 +604,31 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata IMX6Q_GPR1_GINT); } +static void imx6_pm_poweroff(void) +{ + imx6_set_lpm(STOP_POWER_OFF); + cpu_suspend(0, imx6q_suspend_finish); + + mdelay(1000); + + pr_emerg("Unable to poweroff system\n"); +} + +static int imx6_pm_poweroff_probe(void) +{ + char symname[KSYM_NAME_LEN]; + + if (pm_power_off) { + lookup_symbol_name((ulong)pm_power_off, symname); + pr_warn("%s: pm_power_off already claimed %p %s!\n", + __func__, pm_power_off, symname); + return -EBUSY; + } + + pm_power_off = imx6_pm_poweroff; + return 0; +} + void __init imx6_pm_ccm_init(const char *ccm_compat) { struct device_node *np; @@ -618,6 +645,9 @@ 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_poweroff_probe(); } void __init imx6q_pm_init(void) -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
