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authorYunus Bas <y.bas@phytec.de>2021-11-24 11:06:54 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2021-12-28 16:03:03 +0300
commit968011a291f3c80afe9446968d21422569f1bc1c (patch)
tree656b960ab2e860aab41b03dbe572eaea3aa3ded9 /drivers/watchdog/da9063_wdt.c
parent1fc8a2c021c3abb8083ef4d9b6d4c93f88f33dc7 (diff)
downloadlinux-968011a291f3c80afe9446968d21422569f1bc1c.tar.xz
watchdog: da9063: use atomic safe i2c transfer in reset handler
This patch is based on commit 057b52b4b3d5 ("watchdog: da9062: make restart handler atomic safe"), which uses the atomic transfer capability of the i2c framework. Signed-off-by: Yunus Bas <y.bas@phytec.de> Signed-off-by: Andrej Picej <andrej.picej@norik.com> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20211124080654.2601135-1-andrej.picej@norik.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/da9063_wdt.c')
-rw-r--r--drivers/watchdog/da9063_wdt.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index d79ce64e26a9..9adad1862bbd 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
+#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
@@ -169,14 +170,19 @@ static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
void *data)
{
struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ struct i2c_client *client = to_i2c_client(da9063->dev);
int ret;
- ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
- DA9063_SHUTDOWN);
- if (ret)
+ /* Don't use regmap because it is not atomic safe */
+ ret = i2c_smbus_write_byte_data(client, DA9063_REG_CONTROL_F,
+ DA9063_SHUTDOWN);
+ if (ret < 0)
dev_alert(da9063->dev, "Failed to shutdown (err = %d)\n",
ret);
+ /* wait for reset to assert... */
+ mdelay(500);
+
return ret;
}