mmc: Only retrieve cd pin when GPIO is enabled

The driver only needs to retrieve the pin for the ACPI info. The driver
itself works without depending on GPIO.
Signed-off-by: NHarm Berntsen <harm.berntsen@nedap.com>
CC: Simon Glass <sjg@chromium.org>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/mmc/pci_mmc.c

@@ -52,9 +52,11 @@ static int pci_mmc_probe(struct udevice *dev)
 
 static int pci_mmc_of_to_plat(struct udevice *dev)
 {
-	struct pci_mmc_priv *priv = dev_get_priv(dev);
+	if (CONFIG_IS_ENABLED(DM_GPIO)) {
+		struct pci_mmc_priv *priv = dev_get_priv(dev);
 
-	gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
+		gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
+	}
 
 	return 0;
 }