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Subject[PATCH v3 6/6] mfd: max77620: Provide system power-off functionality
Date
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 9b0009c29610..e56223bde568 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -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 +566,13 @@ 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
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