diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index e28e3065c99d..3e26bdf8806b 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1390,17 +1390,12 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 
 	dev_dbg(dev, "Reference clock set to %i Hz\n", uartclk);
 
+	/*
+	 * Set up each port's state before registering the gpiochip,
+	 * since the gpiochip callbacks will read s->p[i].regmap as
+	 * soon as gpiolib exposes the controller.
+	 */
 	for (i = 0; i < devtype->nr; i++) {
-		unsigned int line;
-
-		line = find_first_zero_bit(max310x_lines, MAX310X_UART_NRMAX);
-		if (line == MAX310X_UART_NRMAX) {
-			ret = -ERANGE;
-			goto out_uart;
-		}
-
-		/* Initialize port data */
-		s->p[i].port.line	= line;
 		s->p[i].port.dev	= dev;
 		s->p[i].port.irq	= irq;
 		s->p[i].port.type	= PORT_MAX310X;
@@ -1430,20 +1425,16 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 		INIT_WORK(&s->p[i].md_work, max310x_md_proc);
 		/* Initialize queue for changing RS485 mode */
 		INIT_WORK(&s->p[i].rs_work, max310x_rs_proc);
-
-		/* Register port */
-		ret = uart_add_one_port(&max310x_uart, &s->p[i].port);
-		if (ret)
-			goto out_uart;
-
-		set_bit(line, max310x_lines);
-
-		/* Go to suspend mode */
-		max310x_power(&s->p[i].port, 0);
 	}
 
 #ifdef CONFIG_GPIOLIB
-	/* Setup GPIO controller */
+	/*
+	 * Register the GPIO controller before adding the UART ports so
+	 * that consumers referencing the chip's own GPIOs from device
+	 * tree (for example rs485-term-gpios = <&max310x ...>) can
+	 * resolve them at uart_add_one_port() time instead of receiving
+	 * -EPROBE_DEFER from their own provider.
+	 */
 	s->gpio.owner		= THIS_MODULE;
 	s->gpio.parent		= dev;
 	s->gpio.label		= devtype->name;
@@ -1460,6 +1451,27 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 		goto out_uart;
 #endif
 
+	for (i = 0; i < devtype->nr; i++) {
+		unsigned int line;
+
+		line = find_first_zero_bit(max310x_lines, MAX310X_UART_NRMAX);
+		if (line == MAX310X_UART_NRMAX) {
+			ret = -ERANGE;
+			goto out_uart;
+		}
+		s->p[i].port.line = line;
+
+		/* Register port */
+		ret = uart_add_one_port(&max310x_uart, &s->p[i].port);
+		if (ret)
+			goto out_uart;
+
+		set_bit(line, max310x_lines);
+
+		/* Go to suspend mode */
+		max310x_power(&s->p[i].port, 0);
+	}
+
 	/* Setup interrupt */
 	ret = devm_request_threaded_irq(dev, irq, NULL, max310x_ist,
 					IRQF_ONESHOT | IRQF_SHARED, dev_name(dev), s);