linux-kernel - [PATCH 4/6] power/reset: st-poweroff: Register with kernel restart handler

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Message-Id: <1422209622-31994-4-git-send-email-linux@roeck-us.net>
Date:	Sun, 25 Jan 2015 10:13:40 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	linux-pm@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	David Woodhouse <dwmw2@...radead.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] power/reset: st-poweroff: Register with kernel restart handler

Register with kernel restart handler instead of setting arm_pm_restart
directly. Select high priority since the restart handler is instantiated
through devicetree, indicating that it should be used if configured.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/power/reset/st-poweroff.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/power/reset/st-poweroff.c b/drivers/power/reset/st-poweroff.c
index a0acf25..27383de 100644
--- a/drivers/power/reset/st-poweroff.c
+++ b/drivers/power/reset/st-poweroff.c
@@ -15,10 +15,9 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/syscon.h>
+#include <linux/reboot.h>
 #include <linux/regmap.h>
 
-#include <asm/system_misc.h>
-
 struct reset_syscfg {
 	struct regmap *regmap;
 	/* syscfg used for reset */
@@ -75,7 +74,8 @@ static struct reset_syscfg stid127_reset = {
 
 static struct reset_syscfg *st_restart_syscfg;
 
-static void st_restart(enum reboot_mode reboot_mode, const char *cmd)
+static int st_restart(struct notifier_block *this, unsigned long mode,
+		      void *cmd)
 {
 	/* reset syscfg updated */
 	regmap_update_bits(st_restart_syscfg->regmap,
@@ -88,8 +88,15 @@ static void st_restart(enum reboot_mode reboot_mode, const char *cmd)
 			   st_restart_syscfg->offset_rst_msk,
 			   st_restart_syscfg->mask_rst_msk,
 			   0);
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block st_restart_nb = {
+	.notifier_call = st_restart,
+	.priority = 192,
+};
+
 static struct of_device_id st_reset_of_match[] = {
 	{
 		.compatible = "st,stih415-restart",
@@ -126,9 +133,7 @@ static int st_reset_probe(struct platform_device *pdev)
 		return PTR_ERR(st_restart_syscfg->regmap);
 	}
 
-	arm_pm_restart = st_restart;
-
-	return 0;
+	return register_restart_handler(&st_restart_nb);
 }
 
 static struct platform_driver st_reset_driver = {
-- 
2.1.0

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