Use device life-cycle managed register function to simplify probe and
exit paths.

Signed-off-by: Andrew Davis <afd@ti.com>
---
 drivers/power/reset/as3722-poweroff.c | 30 ++++++++++-----------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/power/reset/as3722-poweroff.c b/drivers/power/reset/as3722-poweroff.c
index ab3350ce2d621..bb26fa6fa67ca 100644
--- a/drivers/power/reset/as3722-poweroff.c
+++ b/drivers/power/reset/as3722-poweroff.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/reboot.h>
 #include <linux/slab.h>
 
 struct as3722_poweroff {
@@ -18,22 +19,18 @@ struct as3722_poweroff {
 	struct as3722 *as3722;
 };
 
-static struct as3722_poweroff *as3722_pm_poweroff;
-
-static void as3722_pm_power_off(void)
+static int as3722_pm_power_off(struct sys_off_data *data)
 {
+	struct as3722_poweroff *as3722_pm_poweroff = data->cb_data;
 	int ret;
 
-	if (!as3722_pm_poweroff) {
-		pr_err("AS3722 poweroff is not initialised\n");
-		return;
-	}
-
 	ret = as3722_update_bits(as3722_pm_poweroff->as3722,
 		AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF);
 	if (ret < 0)
 		dev_err(as3722_pm_poweroff->dev,
 			"RESET_CONTROL_REG update failed, %d\n", ret);
+
+	return NOTIFY_DONE;
 }
 
 static int as3722_poweroff_probe(struct platform_device *pdev)
@@ -54,18 +51,14 @@ static int as3722_poweroff_probe(struct platform_device *pdev)
 
 	as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent);
 	as3722_poweroff->dev = &pdev->dev;
-	as3722_pm_poweroff = as3722_poweroff;
-	if (!pm_power_off)
-		pm_power_off = as3722_pm_power_off;
 
-	return 0;
-}
+	return devm_register_sys_off_handler(as3722_poweroff->dev,
+					     SYS_OFF_MODE_POWER_OFF,
+					     SYS_OFF_PRIO_DEFAULT,
+					     as3722_pm_power_off,
+					     as3722_poweroff);
 
-static void as3722_poweroff_remove(struct platform_device *pdev)
-{
-	if (pm_power_off == as3722_pm_power_off)
-		pm_power_off = NULL;
-	as3722_pm_poweroff = NULL;
+	return 0;
 }
 
 static struct platform_driver as3722_poweroff_driver = {
@@ -73,7 +66,6 @@ static struct platform_driver as3722_poweroff_driver = {
 		.name = "as3722-power-off",
 	},
 	.probe = as3722_poweroff_probe,
-	.remove_new = as3722_poweroff_remove,
 };
 
 module_platform_driver(as3722_poweroff_driver);
-- 
2.39.2