From 59b0f51335644ee603260faaa4298c0115fb7187 Mon Sep 17 00:00:00 2001 From: Fengquan Chen Date: Tue, 14 Sep 2021 20:34:54 +0800 Subject: [PATCH] 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 Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20210914123454.32603-3-Fengquan.Chen@mediatek.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/mtk_wdt.c | 7 +++++++ 1 file changed, 7 insertions(+) --- 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 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 if (err) return err; } + + mtk_wdt->disable_wdt_extrst = + of_property_read_bool(dev->of_node, "mediatek,disable-extrst"); + return 0; }