power/reset: brcmstb: Register with kernel restart handler

Register with kernel restart handler instead of setting arm_pm_restart directly.

Cc: Marc Carino <marc.ceeeee@gmail.com>
Cc: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c
index 3f23692..1ad5629 100644 (file)
--- a/drivers/power/reset/brcmstb-reboot.c
+++ b/drivers/power/reset/brcmstb-reboot.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/jiffies.h>
+#include <linux/notifier.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
@@ -26,8 +27,6 @@
 #include <linux/smp.h>
 #include <linux/mfd/syscon.h>
 
-#include <asm/system_misc.h>
-
 #define RESET_SOURCE_ENABLE_REG 1
 #define SW_MASTER_RESET_REG 2
 
@@ -35,7 +34,8 @@ static struct regmap *regmap;
 static u32 rst_src_en;
 static u32 sw_mstr_rst;
 
-static void brcmstb_reboot(enum reboot_mode mode, const char *cmd)
+static int brcmstb_restart_handler(struct notifier_block *this,
+                                  unsigned long mode, void *cmd)
 {
        int rc;
        u32 tmp;
@@ -43,31 +43,38 @@ static void brcmstb_reboot(enum reboot_mode mode, const char *cmd)
        rc = regmap_write(regmap, rst_src_en, 1);
        if (rc) {
                pr_err("failed to write rst_src_en (%d)\n", rc);
-               return;
+               return NOTIFY_DONE;
        }
 
        rc = regmap_read(regmap, rst_src_en, &tmp);
        if (rc) {
                pr_err("failed to read rst_src_en (%d)\n", rc);
-               return;
+               return NOTIFY_DONE;
        }
 
        rc = regmap_write(regmap, sw_mstr_rst, 1);
        if (rc) {
                pr_err("failed to write sw_mstr_rst (%d)\n", rc);
-               return;
+               return NOTIFY_DONE;
        }
 
        rc = regmap_read(regmap, sw_mstr_rst, &tmp);
        if (rc) {
                pr_err("failed to read sw_mstr_rst (%d)\n", rc);
-               return;
+               return NOTIFY_DONE;
        }
 
        while (1)
                ;
+
+       return NOTIFY_DONE;
 }
 
+static struct notifier_block brcmstb_restart_nb = {
+       .notifier_call = brcmstb_restart_handler,
+       .priority = 128,
+};
+
 static int brcmstb_reboot_probe(struct platform_device *pdev)
 {
        int rc;
@@ -93,9 +100,12 @@ static int brcmstb_reboot_probe(struct platform_device *pdev)
                return -EINVAL;
        }
 
-       arm_pm_restart = brcmstb_reboot;
+       rc = register_restart_handler(&brcmstb_restart_nb);
+       if (rc)
+               dev_err(&pdev->dev,
+                       "cannot register restart handler (err=%d)\n", rc);
 
-       return 0;
+       return rc;
 }
 
 static const struct of_device_id of_match[] = {