linux-kernel - [PATCH v2 09/10] power/reset: hisi: Register with kernel restart handler

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Date:	Tue, 30 Sep 2014 10:48:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	linux-pm@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Haojian Zhuang <haojian.zhuang@...aro.org>
Subject: [PATCH v2 09/10] power/reset: hisi: Register with kernel restart handler

Register with kernel restart handler instead of setting arm_pm_restart directly.

Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/power/reset/hisi-reboot.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/power/reset/hisi-reboot.c b/drivers/power/reset/hisi-reboot.c
index 0c91d02..5385460 100644
--- a/drivers/power/reset/hisi-reboot.c
+++ b/drivers/power/reset/hisi-reboot.c
@@ -14,27 +14,36 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
 
 #include <asm/proc-fns.h>
-#include <asm/system_misc.h>
 
 static void __iomem *base;
 static u32 reboot_offset;
 
-static void hisi_restart(enum reboot_mode mode, const char *cmd)
+static int hisi_restart_handler(struct notifier_block *this,
+				unsigned long mode, void *cmd)
 {
 	writel_relaxed(0xdeadbeef, base + reboot_offset);
 
 	while (1)
 		cpu_do_idle();
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block hisi_restart_nb = {
+	.notifier_call = hisi_restart_handler,
+	.priority = 128,
+};
+
 static int hisi_reboot_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	int err;
 
 	base = of_iomap(np, 0);
 	if (!base) {
@@ -47,9 +56,12 @@ static int hisi_reboot_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	arm_pm_restart = hisi_restart;
+	err = register_restart_handler(&hisi_restart_nb);
+	if (err)
+		dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
+			err);
 
-	return 0;
+	return err;
 }
 
 static struct of_device_id hisi_reboot_of_match[] = {
-- 
1.9.1

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