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

Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/power/reset/mt6323-poweroff.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
index 57a63c0ab7fb7..c663347547f97 100644
--- a/drivers/power/reset/mt6323-poweroff.c
+++ b/drivers/power/reset/mt6323-poweroff.c
@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/mfd/mt6397/core.h>
 #include <linux/mfd/mt6397/rtc.h>
+#include <linux/reboot.h>
 
 struct mt6323_pwrc {
 	struct device *dev;
@@ -21,11 +22,9 @@ struct mt6323_pwrc {
 	u32 base;
 };
 
-static struct mt6323_pwrc *mt_pwrc;
-
-static void mt6323_do_pwroff(void)
+static int mt6323_do_pwroff(struct sys_off_data *data)
 {
-	struct mt6323_pwrc *pwrc = mt_pwrc;
+	struct mt6323_pwrc *pwrc = data->cb_data;
 	unsigned int val;
 	int ret;
 
@@ -44,6 +43,8 @@ static void mt6323_do_pwroff(void)
 	mdelay(1000);
 
 	WARN_ONCE(1, "Unable to power off system\n");
+
+	return NOTIFY_DONE;
 }
 
 static int mt6323_pwrc_probe(struct platform_device *pdev)
@@ -51,6 +52,7 @@ static int mt6323_pwrc_probe(struct platform_device *pdev)
 	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
 	struct mt6323_pwrc *pwrc;
 	struct resource *res;
+	int ret;
 
 	pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
 	if (!pwrc)
@@ -63,19 +65,18 @@ static int mt6323_pwrc_probe(struct platform_device *pdev)
 	pwrc->base = res->start;
 	pwrc->regmap = mt6397_chip->regmap;
 	pwrc->dev = &pdev->dev;
-	mt_pwrc = pwrc;
 
-	pm_power_off = &mt6323_do_pwroff;
+	ret = devm_register_sys_off_handler(pwrc->dev,
+					    SYS_OFF_MODE_POWER_OFF,
+					    SYS_OFF_PRIO_DEFAULT,
+					    mt6323_do_pwroff,
+					    pwrc);
+	if (ret)
+		return dev_err_probe(pwrc->dev, ret, "failed to register power-off handler\n");
 
 	return 0;
 }
 
-static void mt6323_pwrc_remove(struct platform_device *pdev)
-{
-	if (pm_power_off == &mt6323_do_pwroff)
-		pm_power_off = NULL;
-}
-
 static const struct of_device_id mt6323_pwrc_dt_match[] = {
 	{ .compatible = "mediatek,mt6323-pwrc" },
 	{},
@@ -84,7 +85,6 @@ MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);
 
 static struct platform_driver mt6323_pwrc_driver = {
 	.probe          = mt6323_pwrc_probe,
-	.remove_new     = mt6323_pwrc_remove,
 	.driver         = {
 		.name   = "mt6323-pwrc",
 		.of_match_table = mt6323_pwrc_dt_match,
-- 
2.39.2