[AM572xEVM] Power off signal to PMIC

Hi Kaka,

As far as I understand from the sources, when the poweroff command is executed on the target board running Linux, the following happens:

 1. Command propagates throughout the system, turning off the active SoC modules, unmounting the filesystem & so on.

 2. The PMIC is shut down with a command send through the dedicated i2c interface; it is a write to the appropriate PMIC hw register. See the palmas_power_off() function in drivers/mfd/palmas.c:

static void palmas_power_off(void)

{

       unsigned int addr;

       int ret, slave;

        if (!palmas_dev)

               return;

        slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);

        addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_DEV_CTRL);

        ret = regmap_update_bits(

                       palmas_dev->regmap[slave],

                       addr,

                       PALMAS_DEV_CTRL_DEV_ON,

                       0);

          if (ret)

                  pr_err("%s: Unable to write to DEV_CTRL_DEV_ON: %d\n",

                                __func__, ret);

}

Hope this helps.

Best Regards, 
Yordan