[PATCH v2 3/4] watchdog: imxwd: support .running device parameter on i.MX2+

[Ahmad Fatoum]

The i.MX can be fused to start the watchdog on power-on reset.
To give users an easy way to determine whether the watchdog is running,
implement support for WDOG_HW_RUNNING.

Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
v1 -> v2:
  Use new WDOG_HW_RUNNING_SUPPORTED
---
 drivers/watchdog/imxwd.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
index 77a3bd76cefa..e4a4b5ee71f5 100644
--- a/drivers/watchdog/imxwd.c
+++ b/drivers/watchdog/imxwd.c
@@ -28,6 +28,7 @@ struct imx_wd_ops {
        int (*set_timeout)(struct imx_wd *, unsigned);
        void (*soc_reset)(struct imx_wd *);
        int (*init)(struct imx_wd *);
+       bool (*is_running)(struct imx_wd *);
        unsigned int timeout_max;
 };
 
@@ -111,6 +112,11 @@ static void imx1_soc_reset(struct imx_wd *priv)
        writew(IMX1_WDOG_WCR_WDE, priv->base + IMX1_WDOG_WCR);
 }
 
+static inline bool imx21_watchdog_is_running(struct imx_wd *priv)
+{
+       return imxwd_read(priv, IMX21_WDOG_WCR) & IMX21_WDOG_WCR_WDE;
+}
+
 static int imx21_watchdog_set_timeout(struct imx_wd *priv, unsigned timeout)
 {
        u16 val;
@@ -243,6 +249,12 @@ static int imx_wd_probe(struct device_d *dev)
                                                "fsl,ext-reset-output");
 
        if (IS_ENABLED(CONFIG_WATCHDOG_IMX)) {
+               if (priv->ops->is_running) {
+                       set_bit(WDOG_HW_RUNNING_SUPPORTED, &priv->wd.status);
+                       if (priv->ops->is_running(priv))
+                               set_bit(WDOG_HW_RUNNING, &priv->wd.status);
+               }
+
                ret = watchdog_register(&priv->wd);
                if (ret)
                        goto on_error;
@@ -277,6 +289,7 @@ static const struct imx_wd_ops imx21_wd_ops = {
        .set_timeout = imx21_watchdog_set_timeout,
        .soc_reset = imx21_soc_reset,
        .init = imx21_wd_init,
+       .is_running = imx21_watchdog_is_running,
        .timeout_max = 128,
 };
 
-- 
2.24.0.rc1


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