gpio: xilinx: Add support for using label property

Add support for reading label property from DT and set up bank name
based on that. If label property is not present full device node name is
used.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>

drivers/gpio/xilinx_gpio.c

@@ -241,8 +241,16 @@ static int xilinx_gpio_probe(struct udevice *dev)
 	struct xilinx_gpio_platdata *platdata = dev_get_platdata(dev);
 	struct xilinx_gpio_privdata *priv = dev_get_priv(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	const void *label_ptr;
 
-	uc_priv->bank_name = dev->name;
+	label_ptr = dev_read_prop(dev, "label", NULL);
+	if (label_ptr) {
+		uc_priv->bank_name = strdup(label_ptr);
+		if (!uc_priv->bank_name)
+			return -ENOMEM;
+	} else {
+		uc_priv->bank_name = dev->name;
+	}
 
 	uc_priv->gpio_count = platdata->bank_max[0] + platdata->bank_max[1];
 

drivers/gpio/zynq_gpio.c

@@ -336,8 +336,16 @@ static int zynq_gpio_probe(struct udevice *dev)
 {
 	struct zynq_gpio_platdata *platdata = dev_get_platdata(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	const void *label_ptr;
 
-	uc_priv->bank_name = dev->name;
+	label_ptr = dev_read_prop(dev, "label", NULL);
+	if (label_ptr) {
+		uc_priv->bank_name = strdup(label_ptr);
+		if (!uc_priv->bank_name)
+			return -ENOMEM;
+	} else {
+		uc_priv->bank_name = dev->name;
+	}
 
 	if (platdata->p_data)
 		uc_priv->gpio_count = platdata->p_data->ngpio;