Commit 59b0f513 authored by Fengquan Chen's avatar Fengquan Chen Committed by Wim Van Sebroeck
Browse files

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: default avatarFengquan Chen <fengquan.chen@mediatek.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210914123454.32603-3-Fengquan.Chen@mediatek.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent eed09878

drivers/watchdog/mtk_wdt.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}