[PATCH 2/4] mfd: max77620: convert poweroff support to sys-off API

[Diogo Ivo]

Convert max77620_pm_power_off() to the sys-off callback prototype and
register it with the sys-off API when the device tree marks the PMIC as
a system power controller. This also removes the global max77620_scratch
pointer by passing the chip instance through the callback data.

This modernizes the driver's poweroff handling and aligns it with
the kernel sys-off infrastructure.

Signed-off-by: Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt>
---
 drivers/mfd/max77620.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index 3af2974b3023..c4f89a9681f3 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -31,11 +31,10 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/reboot.h>
 #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),
 };
@@ -484,13 +483,15 @@ static int max77620_read_es_version(struct max77620_chip *chip)
 	return ret;
 }
 
-static void max77620_pm_power_off(void)
+static int max77620_pm_power_off(struct sys_off_data *data)
 {
-	struct max77620_chip *chip = max77620_scratch;
+	struct max77620_chip *chip = data->cb_data;
 
 	regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 			   MAX77620_ONOFFCNFG1_SFT_RST,
 			   MAX77620_ONOFFCNFG1_SFT_RST);
+
+	return NOTIFY_DONE;
 }
 
 static int max77620_probe(struct i2c_client *client)
@@ -501,7 +502,6 @@ static int max77620_probe(struct i2c_client *client)
 	struct regmap_irq_chip *chip_desc;
 	const struct mfd_cell *mfd_cells;
 	int n_mfd_cells;
-	bool pm_off;
 	int ret;
 
 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
@@ -573,10 +573,14 @@ 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;
+	if (of_device_is_system_power_controller(client->dev.of_node)) {
+		ret = devm_register_sys_off_handler(&client->dev,
+						    SYS_OFF_MODE_POWER_OFF,
+						    SYS_OFF_PRIO_DEFAULT,
+						    max77620_pm_power_off, chip);
+		if (ret)
+			return dev_err_probe(&client->dev, ret,
+					"failed to register power-off handler\n");
 	}
 
 	return 0;

-- 
2.54.0