rcar_gen3: drivers: cpld: fix power-off on reset

Method cpld_reset_cpu of bl31 is called from the Linux kernel and uses
GPIO6, GPIO2 pins as SPI bus lines to control the CPLD device. But in the
kernel GPIO6_8 pin are initialized to work in interrupt mode instead of
the input/output mode. This leads to the fact that the SPI bus becomes
non-functional. In this patch we switch the GPIO6_8 pin back to the
input-output mode.
Signed-off-by: Sergii Boryshchenko <sergii.boryshchenko@globallogic.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>

drivers/renesas/rcar/cpld/ulcb_cpld.c

@@ -24,6 +24,9 @@
 #define GPIO_INOUTSEL2		0xE6052004
 #define GPIO_INOUTSEL6		0xE6055404
 
+/* General IO/Interrupt Switching Register */
+#define GPIO_IOINTSEL6		0xE6055400
+
 /* GPIO/perihperal function select */
 #define PFC_GPSR2		0xE6060108
 #define PFC_GPSR6		0xE6060118
@@ -93,6 +96,7 @@ static void cpld_init(void)
 	gpio_pfc(PFC_GPSR2, SSTBZ);
 	gpio_pfc(PFC_GPSR6, MOSI);
 
+	gpio_set_value(GPIO_IOINTSEL6, SCLK, 0);
 	gpio_set_value(GPIO_OUTDT6, SCLK, 0);
 	gpio_set_value(GPIO_OUTDT2, SSTBZ, 1);
 	gpio_set_value(GPIO_OUTDT6, MOSI, 0);