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mfd: max77620: Provide system power-off functionality 

Provide system power-off functionality that allows to turn off machine
gracefully.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Dmitry Osipenko 2019-05-05 18:43:24 +03:00 committed by Lee Jones
parent 4c58f7012f
commit 744b13107d
1 changed files with 18 additions and 0 deletions
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18
drivers/mfd/max77620.c
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@ -37,6 +37,8 @@
#include <linux/regmap.h>
#include <linux/slab.h>
static struct max77620_chip *max77620_scratch;
static const struct resource gpio_resources[] = {
DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
};
@ -481,6 +483,15 @@ static int max77620_read_es_version(struct max77620_chip *chip)
return ret;
}
static void max77620_pm_power_off(void)
{
struct max77620_chip *chip = max77620_scratch;
regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
MAX77620_ONOFFCNFG1_SFT_RST,
MAX77620_ONOFFCNFG1_SFT_RST);
}
static int max77620_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -488,6 +499,7 @@ static int max77620_probe(struct i2c_client *client,
struct max77620_chip *chip;
const struct mfd_cell *mfd_cells;
int n_mfd_cells;
bool pm_off;
int ret;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
@ -554,6 +566,12 @@ static int max77620_probe(struct i2c_client *client,
return ret;
}
pm_off = of_device_is_system_power_controller(client->dev.of_node);
if (pm_off && !pm_power_off) {
max77620_scratch = chip;
pm_power_off = max77620_pm_power_off;
}
return 0;
}