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authorDmitry Osipenko <digetx@gmail.com>2019-05-05 18:43:24 +0300
committerLee Jones <lee.jones@linaro.org>2019-05-08 12:50:14 +0100
commit744b13107d0d2ec36c5293d7b59129d3186c9396 (patch)
tree6c43633a3ee6c34718acafcfea669b74a8d6bc06 /drivers/mfd
parent4c58f7012f15a71f05cd447f7658a61376d11591 (diff)
downloadlinux-744b13107d0d2ec36c5293d7b59129d3186c9396.tar.bz2
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/max77620.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index c2d88a5eca7a..436361ce3737 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 +566,12 @@ 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;
}