Hi Alvin,

I did a quick test and this looks like it works for me (with device tree).
I had a couple of small fixes below.

It is very appreciated to help testing.

Alan

quoted

-	port->bgc.gc.ngpio = ngpio;
-	port->bgc.gc.of_node = port_np;
+#ifdef CONFIG_OF_GPIO
+	port->bgc.gc.of_node = pp->node;
+#endif

Please use 'if (IS_ENABLED(CONFIG_OF_GPIO)) as a conditional as you do
elsewhere.

OK.

quoted

 static int dwapb_gpio_probe(struct platform_device *pdev)  {
+	int i;
 	struct resource *res;
 	struct dwapb_gpio *gpio;
-	struct device_node *np;
 	int err;
-	unsigned int offs = 0;
+	struct device *dev = &pdev->dev;
+	struct dwapb_platform_data *pdata = dev_get_platdata(dev);
+	bool is_pdata_alloc = !pdata;

Please combine the int's in one line (int err, i;) and put them as the last one on
this list.  It looks the same to the compiler of course, but more uniform for
human eyes :)

OK.