fec: Do not assume that PHY reset is active low

We should not assume that the PHY reset is always active low.

Retrieve this information from the device tree instead, so that the PHY reset
can work on both cases.

Reported-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec_main.c

@@ -2049,6 +2049,8 @@ static void fec_reset_phy(struct platform_device *pdev)
 	int err, phy_reset;
 	int msec = 1;
 	struct device_node *np = pdev->dev.of_node;
+	enum of_gpio_flags flags;
+	bool port;
 
 	if (!np)
 		return;
@@ -2058,18 +2060,22 @@ static void fec_reset_phy(struct platform_device *pdev)
 	if (msec > 1000)
 		msec = 1;
 
-	phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
+	phy_reset = of_get_named_gpio_flags(np, "phy-reset-gpios", 0, &flags);
 	if (!gpio_is_valid(phy_reset))
 		return;
 
-	err = devm_gpio_request_one(&pdev->dev, phy_reset,
-				    GPIOF_OUT_INIT_LOW, "phy-reset");
+	if (flags & OF_GPIO_ACTIVE_LOW)
+		port = GPIOF_OUT_INIT_LOW;
+	else
+		port = GPIOF_OUT_INIT_HIGH;
+
+	err = devm_gpio_request_one(&pdev->dev, phy_reset, port, "phy-reset");
 	if (err) {
 		dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", err);
 		return;
 	}
 	msleep(msec);
-	gpio_set_value(phy_reset, 1);
+	gpio_set_value(phy_reset, !port);
 }
 #else /* CONFIG_OF */
 static void fec_reset_phy(struct platform_device *pdev)