Commit 744b1310 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Lee Jones
Browse files

mfd: max77620: Provide system power-off functionality 



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

Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 4c58f701

drivers/mfd/max77620.c

+18 −0
Original line number Diff line number Diff line
@@ -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;

}