[PATCH v2 7/7] mfd: max77620: Provide system power-off functionality

Dmitry Osipenko
2019-04-22T19:19:16Z

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

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/mfd/max77620.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index b7a058069808..3b8fd0b45425 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -41,6 +41,8 @@ struct max77620_desc {
enum max77620_chip_id chip_id;
};

+static struct max77620_chip *max77620_scratch;
+
static const struct resource gpio_resources[] = {
DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
};
@@ -485,6 +487,15 @@ 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)
{
@@ -493,6 +504,7 @@ static int max77620_probe(struct i2c_client *client,
const struct mfd_cell *mfd_cells;
const struct max77620_desc *desc;
int n_mfd_cells;
+ bool pm_off;
int ret;

chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
@@ -563,6 +575,13 @@ static int max77620_probe(struct i2c_client *client,
return ret;
}

+ pm_off = of_property_read_bool(client->dev.of_node,
+ "maxim,system-power-controller");
+ if (pm_off && !pm_power_off) {
+ max77620_scratch = chip;
+ pm_power_off = max77620_pm_power_off;
+ }
+
return 0;
}

--
2.21.0