[v3,2/2] watchdog: mtk: add disable_wdt_extrst support
From: Fengquan Chen <hidden>
Date: 2021-09-14 12:35:13
Also in:
linux-devicetree, linux-mediatek, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
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 <redacted> Reviewed-by: Guenter Roeck <linux@roeck-us.net> --- drivers/watchdog/mtk_wdt.c | 7 +++++++ 1 file changed, 7 insertions(+)
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; }
--
2.25.1
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