MIPS: txx9: rbtx4938: switch to gpiochip_add_data()

We're planning to remove the gpiochip_add() function to swith
to gpiochip_add_data() with NULL for data argument.

Cc: linux-mips@linux-mips.org
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/mips/txx9/rbtx4938/setup.c b/arch/mips/txx9/rbtx4938/setup.c
index c9afd05..54de668 100644
--- a/arch/mips/txx9/rbtx4938/setup.c
+++ b/arch/mips/txx9/rbtx4938/setup.c
@@ -14,6 +14,7 @@
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
+#include <linux/gpio/driver.h>
 #include <linux/gpio.h>
 #include <linux/mtd/physmap.h>
 
@@ -335,7 +336,7 @@
 
 static void __init rbtx4938_arch_init(void)
 {
-	gpiochip_add(&rbtx4938_spi_gpio_chip);
+	gpiochip_add_data(&rbtx4938_spi_gpio_chip, NULL);
 	rbtx4938_pci_setup();
 	rbtx4938_spi_init();
 }