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authorYang Xiwen <forbidden405@outlook.com>2024-02-21 19:56:41 +0800
committerWim Van Sebroeck <wim@linux-watchdog.org>2024-03-03 14:17:30 +0100
commit575f100c1cce1486f581baefa97dde15b48728c7 (patch)
tree0e05543a2363134b45a20988b2badbc9044a1a1f /drivers/watchdog
parent12b8ab42e1c509121a8d4fae1ba57d3d0f22f571 (diff)
watchdog: sp805_wdt: deassert the reset if available
According to the datasheet, the core has an WDOGRESn input signal that needs to be deasserted before being operational. Implement it in the driver. Signed-off-by: Yang Xiwen <forbidden405@outlook.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20240221-hisi-wdt-v3-1-9642613dc2e6@outlook.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')
-rw-r--r--drivers/watchdog/sp805_wdt.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 2756ed54ca3d..109e2e37e8f0 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -25,6 +25,7 @@
#include <linux/moduleparam.h>
#include <linux/pm.h>
#include <linux/property.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
@@ -232,6 +233,7 @@ static int
sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
{
struct sp805_wdt *wdt;
+ struct reset_control *rst;
u64 rate = 0;
int ret = 0;
@@ -264,6 +266,12 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
return -ENODEV;
}
+ rst = devm_reset_control_get_optional_exclusive(&adev->dev, NULL);
+ if (IS_ERR(rst))
+ return dev_err_probe(&adev->dev, PTR_ERR(rst), "Can not get reset\n");
+
+ reset_control_deassert(rst);
+
wdt->adev = adev;
wdt->wdd.info = &wdt_info;
wdt->wdd.ops = &wdt_ops;