net: dm: fec: Fix phy-reset-duration clamping and defaults

The DT binding says:
- phy-reset-duration : Reset duration in milliseconds.  Should present
  only if property "phy-reset-gpios" is available.  Missing the property
  will have the duration be 1 millisecond.  Numbers greater than 1000 are
  invalid and 1 millisecond will be used instead.

However the current code:
 - clamps values greater than 1000ms to 1000ms rather than 1.
 - does not initialize the delay if the property does not exist
   (else clause mismatch)
 - returns an error if phy-reset-gpios is not defined

Fix all this and simplify by using dev_read_u32_default()

Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index a1295fc..da970ef 100644 (file)
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1352,22 +1352,19 @@ static int fecmxc_ofdata_to_platdata(struct udevice *dev)
 
 #ifdef CONFIG_DM_GPIO
        ret = gpio_request_by_name(dev, "phy-reset-gpios", 0,
-                            &priv->phy_reset_gpio, GPIOD_IS_OUT);
-       if (ret == 0) {
-               ret = dev_read_u32_array(dev, "phy-reset-duration",
-                                        &priv->reset_delay, 1);
-       } else if (ret == -ENOENT) {
-               priv->reset_delay = 1000;
-               ret = 0;
-       }
+                                  &priv->phy_reset_gpio, GPIOD_IS_OUT);
+       if (ret < 0)
+               return 0; /* property is optional, don't return error! */
 
+       priv->reset_delay = dev_read_u32_default(dev, "phy-reset-duration", 1);
        if (priv->reset_delay > 1000) {
-               printf("FEX MXC: gpio reset timeout should be less the 1000\n");
-               priv->reset_delay = 1000;
+               printf("FEC MXC: phy reset duration should be <= 1000ms\n");
+               /* property value wrong, use default value */
+               priv->reset_delay = 1;
        }
 #endif
 
-       return ret;
+       return 0;
 }
 
 static const struct udevice_id fecmxc_ids[] = {