watchdog: bcm6345: callback start use tick instead of ms

The function bcm6345_wdt_start use the argument timeout
as tick but it should be used as milliseconds.

A clock is added as requirement for this driver.
The frequency of the clock is then used to convert the
millisecond to ticks in the function bcm6345_wdt_start.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/watchdog/bcm6345_wdt.c b/drivers/watchdog/bcm6345_wdt.c
index 44f5662..9f14e7d 100644 (file)
--- a/drivers/watchdog/bcm6345_wdt.c
+++ b/drivers/watchdog/bcm6345_wdt.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <dm.h>
 #include <wdt.h>
+#include <clk.h>
 #include <asm/io.h>
 
 /* WDT Value register */
@@ -26,6 +27,7 @@
 
 struct bcm6345_wdt_priv {
        void __iomem *regs;
+       unsigned long clk_rate;
 };
 
 static int bcm6345_wdt_reset(struct udevice *dev)
@@ -41,16 +43,17 @@ static int bcm6345_wdt_reset(struct udevice *dev)
 static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
 {
        struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+       u32 val = priv->clk_rate / 1000 * timeout;
 
-       if (timeout < WDT_VAL_MIN) {
+       if (val < WDT_VAL_MIN) {
                debug("watchdog won't fire with less than 2 ticks\n");
-               timeout = WDT_VAL_MIN;
-       } else if (timeout > WDT_VAL_MAX) {
+               val = WDT_VAL_MIN;
+       } else if (val > WDT_VAL_MAX) {
                debug("maximum watchdog timeout exceeded\n");
-               timeout = WDT_VAL_MAX;
+               val = WDT_VAL_MAX;
        }
 
-       writel(timeout, priv->regs + WDT_VAL_REG);
+       writel(val, priv->regs + WDT_VAL_REG);
 
        return bcm6345_wdt_reset(dev);
 }
@@ -85,11 +88,19 @@ static const struct udevice_id bcm6345_wdt_ids[] = {
 static int bcm6345_wdt_probe(struct udevice *dev)
 {
        struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+       struct clk clk;
+       int ret;
 
        priv->regs = dev_remap_addr(dev);
        if (!priv->regs)
                return -EINVAL;
 
+       ret = clk_get_by_index(dev, 0, &clk);
+       if (!ret)
+               priv->clk_rate = clk_get_rate(&clk);
+       else
+               return -EINVAL;
+
        bcm6345_wdt_stop(dev);
 
        return 0;