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>

diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 2756ed54ca3d55c2d4d25b9b9828101d73244e86..109e2e37e8f09e6f8afd61375f52316664bc744d 100644 (file)
--- 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;