Messages in this thread | | | Subject | Re: [PATCH] watchdog: sp805: add restart handler | From | Guenter Roeck <> | Date | Mon, 30 Apr 2018 04:18:26 -0700 |
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On 04/29/2018 11:44 PM, Jongsung Kim wrote: > Add restart handler for SP805 watchdog so that the driver can be > used to reboot the system. > > Signed-off-by: Jongsung Kim <neidhard.kim@lge.com> > --- > drivers/watchdog/sp805_wdt.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c > index 01d816251302..01f7b6c29f92 100644 > --- a/drivers/watchdog/sp805_wdt.c > +++ b/drivers/watchdog/sp805_wdt.c > @@ -23,6 +23,7 @@ > #include <linux/module.h> > #include <linux/moduleparam.h> > #include <linux/pm.h> > +#include <linux/reboot.h> > #include <linux/slab.h> > #include <linux/spinlock.h> > #include <linux/types.h> > @@ -67,6 +68,7 @@ struct sp805_wdt { > struct clk *clk; > struct amba_device *adev; > unsigned int load_val; > + struct notifier_block restart; > }; > > static bool nowayout = WATCHDOG_NOWAYOUT; > @@ -200,6 +202,18 @@ static const struct watchdog_ops wdt_ops = { > .get_timeleft = wdt_timeleft, > }; > > +static int > +wdt_restart(struct notifier_block *this, unsigned long mode, void *cmd) > +{ > + struct sp805_wdt *wdt = container_of(this, struct sp805_wdt, restart); > + > + writel_relaxed(0, wdt->base + WDTCONTROL); > + writel_relaxed(0, wdt->base + WDTLOAD); > + writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL); > + > + return 0; > +} > + > static int > sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id) > { > @@ -241,6 +255,10 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id) > } > amba_set_drvdata(adev, wdt); > > + wdt->restart.notifier_call = wdt_restart; > + wdt->restart.priority = 128; > + register_restart_handler(&wdt->restart); > +
Why not use the watchdog core ?
Guenter
> dev_info(&adev->dev, "registration successful\n"); > return 0; > > @@ -253,6 +271,7 @@ static int sp805_wdt_remove(struct amba_device *adev) > { > struct sp805_wdt *wdt = amba_get_drvdata(adev); > > + unregister_restart_handler(&wdt->restart); > watchdog_unregister_device(&wdt->wdd); > watchdog_set_drvdata(&wdt->wdd, NULL); > >
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