+static int dp83640_led_brightness_set(struct phy_device *phydev, u8 index,
+				      enum led_brightness brightness)
+{
+	int val;
+
+	if (index > DP83640_SPDLED_IDX)
+		return -EINVAL;
+
+	phy_write(phydev, PAGESEL, 0);
+
+	val = phy_read(phydev, LEDCR) & ~DP83640_LED_DIS(index);
+	val |= DP83640_LED_DRV(index);
+	if (brightness)
+		val |= DP83640_LED_VAL(index);
+	else
+		val &= ~DP83640_LED_VAL(index);
+	phy_write(phydev, LEDCR, val);

I don't understand this driver too well, but should this be using
ext_read() and ext_write().

I'm also woundering if it would be good to implement the .read_page
and .write_page members in phy_driver and then use phy_write_paged()
and phy_write_paged() and phy_modify_paged(), which should do better
locking.

	Andrew