driver:gpio: Added DT support to PI4IO GPIO Expander

BCS 746-001106

drivers/staging/gpio/gpio-pi4ioe5v6408.c

@@ -3,6 +3,7 @@
  * Driver for the Pericom PI4IOE5V6408 GPIO Expander.
  *
  * Copyright (C) 2018 Google, LLC.
+ * Copyright (C) 2023 SECO Northern Europe GmbH
  */
 
 #include <linux/gpio.h>
@@ -217,9 +218,18 @@ static int pi4io_probe(
 	return 0;
 }
 
-static const struct i2c_device_id pi4io_id_table[] = { { "pi4io", 0 }, {} };
+static const struct i2c_device_id pi4io_id_table[] = {
+	{ "pi4io", 0 },
+	{ }
+};
 MODULE_DEVICE_TABLE(i2c, pi4io_id_table);
 
+static const struct of_device_id pi4io_of_table[] = {
+	{ .compatible = "psc,pi4io" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pi4io_of_table);
+
 static struct i2c_driver pi4io_driver = {
 	.driver = {
 		.name = "pi4io-gpio",