wdog: imx7ulp: Enable wdog int_en bit for watchdog any reset

The wdog INT_EN bit in CS register should be set to '1' to trigger
WDOG_ANY external reset on i.MX93.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231010081909.2899101-1-ping.bai@nxp.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
index c703586c6e5f086bd3f577ad77b80bbb052f30b9..b21d7a74a42df79f26399d1cf24484ed140abb46 100644 (file)
--- a/drivers/watchdog/imx7ulp_wdt.c
+++ b/drivers/watchdog/imx7ulp_wdt.c
@@ -23,6 +23,7 @@
 #define LPO_CLK_SHIFT          8
 #define WDOG_CS_CLK            (LPO_CLK << LPO_CLK_SHIFT)
 #define WDOG_CS_EN             BIT(7)
+#define WDOG_CS_INT_EN         BIT(6)
 #define WDOG_CS_UPDATE         BIT(5)
 #define WDOG_CS_WAIT           BIT(1)
 #define WDOG_CS_STOP           BIT(0)
@@ -62,6 +63,7 @@ struct imx7ulp_wdt_device {
        void __iomem *base;
        struct clk *clk;
        bool post_rcs_wait;
+       bool ext_reset;
        const struct imx_wdt_hw_feature *hw;
 };
 
@@ -285,6 +287,9 @@ static int imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout
        if (wdt->hw->prescaler_enable)
                val |= WDOG_CS_PRES;
 
+       if (wdt->ext_reset)
+               val |= WDOG_CS_INT_EN;
+
        do {
                ret = _imx7ulp_wdt_init(wdt, timeout, val);
                toval = readl(wdt->base + WDOG_TOVAL);
@@ -321,6 +326,9 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
                return PTR_ERR(imx7ulp_wdt->clk);
        }
 
+       /* The WDOG may need to do external reset through dedicated pin */
+       imx7ulp_wdt->ext_reset = of_property_read_bool(dev->of_node, "fsl,ext-reset-output");
+
        imx7ulp_wdt->post_rcs_wait = true;
        if (of_device_is_compatible(dev->of_node,
                                    "fsl,imx8ulp-wdt")) {