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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>
This commit is contained in:
Yang Xiwen 2024-02-21 19:56:41 +08:00 committed by Wim Van Sebroeck
parent 12b8ab42e1
commit 575f100c1c
1 changed files with 8 additions and 0 deletions
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8
drivers/watchdog/sp805_wdt.c
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@ -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;