[AVR32] add multidrive support for pio driver

This patch add multidrive support for pio driver
Signed-off-by: Matteo Vit - Dave S.r.l. <matteo.vit@dave.eu>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/mach-at32ap/pio.c

@@ -110,6 +110,10 @@ void __init at32_select_gpio(unsigned int pin, unsigned long flags)
 			pio_writel(pio, SODR, mask);
 		else
 			pio_writel(pio, CODR, mask);
+		if (flags & AT32_GPIOF_MULTIDRV)
+			pio_writel(pio, MDER, mask);
+		else
+			pio_writel(pio, MDDR, mask);
 		pio_writel(pio, PUDR, mask);
 		pio_writel(pio, OER, mask);
 	} else {

include/asm-avr32/arch-at32ap/portmux.h

@@ -19,6 +19,7 @@
 #define AT32_GPIOF_OUTPUT	0x00000002	/* (OUT) Enable output driver */
 #define AT32_GPIOF_HIGH		0x00000004	/* (OUT) Set output high */
 #define AT32_GPIOF_DEGLITCH	0x00000008	/* (IN) Filter glitches */
+#define AT32_GPIOF_MULTIDRV	0x00000010	/* Enable multidriver option */
 
 void at32_select_periph(unsigned int pin, unsigned int periph,
 			unsigned long flags);