gpio: mpc8xxx: add support for MPC5125

The gpio controller on MPC5125 is identical to the MPC5121 register
wise, the only difference is that the lines 0..3 are input only instead
of 28..31 on MPC5121.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mpc8xxx.c

@@ -174,6 +174,15 @@ static int mpc5121_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val
 	return mpc8xxx_gpio_dir_out(gc, gpio, val);
 }
 
+static int mpc5125_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+	/* GPIO 0..3 are input only on MPC5125 */
+	if (gpio <= 3)
+		return -EINVAL;
+
+	return mpc8xxx_gpio_dir_out(gc, gpio, val);
+}
+
 static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
 	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
@@ -341,6 +350,11 @@ static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
 	.irq_set_type = mpc512x_irq_set_type,
 };
 
+static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
+	.gpio_dir_out = mpc5125_gpio_dir_out,
+	.irq_set_type = mpc512x_irq_set_type,
+};
+
 static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
 	.gpio_get = mpc8572_gpio_get,
 };
@@ -356,6 +370,7 @@ static const struct of_device_id mpc8xxx_gpio_ids[] = {
 	{ .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
 	{ .compatible = "fsl,mpc8610-gpio", },
 	{ .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
+	{ .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
 	{ .compatible = "fsl,pq3-gpio",     },
 	{ .compatible = "fsl,qoriq-gpio",   },
 	{}