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authorFengquan Chen <Fengquan.Chen@mediatek.com>2021-09-14 20:34:54 +0800
committerWim Van Sebroeck <wim@linux-watchdog.org>2021-10-26 21:31:11 +0200
commit59b0f51335644ee603260faaa4298c0115fb7187 (patch)
treed1febd853a8a23e8a9f4e4f28ff4c3276c2bae85 /drivers/watchdog
parenteed09878923ef2cd69b832b8ac84f8dfa674f353 (diff)
watchdog: mtk: add disable_wdt_extrst support
In some cases, we may need watchdog just to trigger an internal soc reset without sending any output signal. Provide a disable_wdt_extrst parameter for configuration. We can disable or enable it just by configuring dts. Signed-off-by: Fengquan Chen <fengquan.chen@mediatek.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20210914123454.32603-3-Fengquan.Chen@mediatek.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/mtk_wdt.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 796fbb048cbe..ceb57ea627cd 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -65,6 +65,7 @@ struct mtk_wdt_dev {
void __iomem *wdt_base;
spinlock_t lock; /* protects WDT_SWSYSRST reg */
struct reset_controller_dev rcdev;
+ bool disable_wdt_extrst;
};
struct mtk_wdt_data {
@@ -256,6 +257,8 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev)
reg |= (WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
else
reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
+ if (mtk_wdt->disable_wdt_extrst)
+ reg &= ~WDT_MODE_EXRST_EN;
reg |= (WDT_MODE_EN | WDT_MODE_KEY);
iowrite32(reg, wdt_base + WDT_MODE);
@@ -381,6 +384,10 @@ static int mtk_wdt_probe(struct platform_device *pdev)
if (err)
return err;
}
+
+ mtk_wdt->disable_wdt_extrst =
+ of_property_read_bool(dev->of_node, "mediatek,disable-extrst");
+
return 0;
}