power/reset: vexpress: Register with kernel restart handler

Use the kernel restart handler instead of setting arm_pm_restart directly.
This allows for more than one restart handler in the system.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 30 insertions, 10 deletions

diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c
index 4dc102e2b230..9dfc9cee3232 100644
--- a/drivers/power/reset/vexpress-poweroff.c
+++ b/drivers/power/reset/vexpress-poweroff.c
@@ -12,14 +12,14 @@
  */
 
 #include <linux/delay.h>
+#include <linux/notifier.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/reboot.h>
 #include <linux/stat.h>
 #include <linux/vexpress.h>
 
-#include <asm/system_misc.h>
-
 static void vexpress_reset_do(struct device *dev, const char *what)
 {
         int err = -ENOENT;
@@ -43,11 +43,19 @@ static void vexpress_power_off(void)
 
 static struct device *vexpress_restart_device;
 
-static void vexpress_restart(enum reboot_mode reboot_mode, const char *cmd)
+static int vexpress_restart(struct notifier_block *this, unsigned long mode,
+                             void *cmd)
 {
         vexpress_reset_do(vexpress_restart_device, "restart");
+
+        return NOTIFY_DONE;
 }
 
+static struct notifier_block vexpress_restart_nb = {
+        .notifier_call = vexpress_restart,
+        .priority = 128,
+};
+
 static ssize_t vexpress_reset_active_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -86,12 +94,28 @@ static struct of_device_id vexpress_reset_of_match[] = {
         {}
 };
 
+static int _vexpress_register_restart_handler(struct device *dev)
+{
+        int err;
+
+        vexpress_restart_device = dev;
+        err = register_restart_handler(&vexpress_restart_nb);
+        if (err) {
+                dev_err(dev, "cannot register restart handler (err=%d)\n", err);
+                return err;
+        }
+        device_create_file(dev, &dev_attr_active);
+
+        return 0;
+}
+
 static int vexpress_reset_probe(struct platform_device *pdev)
 {
         enum vexpress_reset_func func;
         const struct of_device_id *match =
                         of_match_device(vexpress_reset_of_match, &pdev->dev);
         struct regmap *regmap;
+        int ret = 0;
 
         if (match)
                 func = (enum vexpress_reset_func)match->data;
@@ -110,18 +134,14 @@ static int vexpress_reset_probe(struct platform_device *pdev)
                 break;
         case FUNC_RESET:
                 if (!vexpress_restart_device)
-                        vexpress_restart_device = &pdev->dev;
-                arm_pm_restart = vexpress_restart;
-                device_create_file(&pdev->dev, &dev_attr_active);
+                        ret = _vexpress_register_restart_handler(&pdev->dev);
                 break;
         case FUNC_REBOOT:
-                vexpress_restart_device = &pdev->dev;
-                arm_pm_restart = vexpress_restart;
-                device_create_file(&pdev->dev, &dev_attr_active);
+                ret = _vexpress_register_restart_handler(&pdev->dev);
                 break;
         };
 
-        return 0;
+        return ret;
 }
 
 static const struct platform_device_id vexpress_reset_id_table[] = {