MIPS: lantiq: improve pci reset gpio handling

We need to make sure that the reset gpio is available and also set a sane
default state.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4817/

arch/mips/pci/pci-lantiq.c

@@ -129,8 +129,16 @@ static int ltq_pci_startup(struct platform_device *pdev)
 
 	/* setup reset gpio used by pci */
 	reset_gpio = of_get_named_gpio(node, "gpio-reset", 0);
-	if (gpio_is_valid(reset_gpio))
-		devm_gpio_request(&pdev->dev, reset_gpio, "pci-reset");
+	if (gpio_is_valid(reset_gpio)) {
+		int ret = devm_gpio_request(&pdev->dev,
+						reset_gpio, "pci-reset");
+		if (ret) {
+			dev_err(&pdev->dev,
+				"failed to request gpio %d\n", reset_gpio);
+			return ret;
+		}
+		gpio_direction_output(reset_gpio, 1);
+	}
 
 	/* enable auto-switching between PCI and EBU */
 	ltq_pci_w32(0xa, PCI_CR_CLK_CTRL);