[PATCH v1 1/1] driver: watchdog: get timeout and clock from dt file

[Rayagonda Kokatanur]

From: Bharat Kumar Reddy Gooty <bharat.go...@broadcom.com>

Get the watchdog default timeout value and clock from the DTS file

Signed-off-by: Bharat Kumar Reddy Gooty <bharat.go...@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokata...@broadcom.com>
---
 drivers/watchdog/sp805_wdt.c | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index ca3ccbe76c..e8f54d6804 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -34,8 +34,31 @@ DECLARE_GLOBAL_DATA_PTR;
 
 struct sp805_wdt_priv {
        void __iomem *reg;
+       u32 timeout_msec;
+       u32 clk_mhz;
 };
 
+static u32 msec_to_ticks(struct udevice *dev)
+{
+       u32 timeout_msec;
+       u32 msec;
+       struct sp805_wdt_priv *priv = dev_get_priv(dev);
+
+       timeout_msec = env_get_ulong("wdt_timeout_msec", 10, 0);
+       if (timeout_msec) {
+               dev_dbg(dev, "Overriding timeout :%u\n", timeout_msec);
+               msec = timeout_msec;
+       } else {
+               msec = priv->timeout_msec;
+       }
+
+       timeout_msec = (msec / 2) * (priv->clk_mhz / 1000);
+
+       dev_dbg(dev, "ticks :%u\n", timeout_msec);
+
+       return timeout_msec;
+}
+
 static int sp805_wdt_reset(struct udevice *dev)
 {
        struct sp805_wdt_priv *priv = dev_get_priv(dev);
@@ -63,8 +86,11 @@ static int sp805_wdt_start(struct udevice *dev, u64 timeout, 
ulong flags)
         * set 120s, the gd->bus_clk is less than 1145MHz, the load_value will
         * not overflow.
         */
-       load_value = (gd->bus_clk) /
-               (2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
+       if (gd->bus_clk)
+               load_value = (gd->bus_clk) /
+                       (2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
+       else /* platform provide clk */
+               load_value = msec_to_ticks(dev);
 
        writel(UNLOCK, priv->reg + WDTLOCK);
        writel(load_value, priv->reg + WDTLOAD);
@@ -110,6 +136,12 @@ static int sp805_wdt_ofdata_to_platdata(struct udevice 
*dev)
        if (IS_ERR(priv->reg))
                return PTR_ERR(priv->reg);
 
+       if (dev_read_u32(dev, "timeout-msec", &priv->timeout_msec))
+               return -ENODATA;
+
+       if (dev_read_u32(dev, "clk-mhz", &priv->clk_mhz))
+               return -ENODATA;
+
        return 0;
 }
 
-- 
2.17.1