From 575f100c1cce1486f581baefa97dde15b48728c7 Mon Sep 17 00:00:00 2001 From: Yang Xiwen Date: Wed, 21 Feb 2024 19:56:41 +0800 Subject: [PATCH] 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 Reviewed-by: Philipp Zabel Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20240221-hisi-wdt-v3-1-9642613dc2e6@outlook.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/sp805_wdt.c | 8 ++++++++ 1 file changed, 8 insertions(+) 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 #include #include +#include #include #include #include @@ -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;