avr32: Enable pullup on USART TX lines

Make USART initialization conform to Section 24.6.1 in the AT32AP7000 manual,
i.e. "To prevent the TXD line from falling when the USART is disabled, the use
of an internal pull up is mandatory."

Signed-off-by: Anders Blomdell <anders.blomdell@control.lth.se>
[haavard.skinnemoen@atmel.com: enable pullup on RX as well]
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index 0c6e02f80a3..066252eebf6 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -967,28 +967,28 @@ static inline void configure_usart0_pins(void)
 {
         u32 pin_mask = (1 << 8) | (1 << 9); /* RXD & TXD */
 
-        select_peripheral(PIOA, pin_mask, PERIPH_B, 0);
+        select_peripheral(PIOA, pin_mask, PERIPH_B, AT32_GPIOF_PULLUP);
 }
 
 static inline void configure_usart1_pins(void)
 {
         u32 pin_mask = (1 << 17) | (1 << 18); /* RXD & TXD */
 
-        select_peripheral(PIOA, pin_mask, PERIPH_A, 0);
+        select_peripheral(PIOA, pin_mask, PERIPH_A, AT32_GPIOF_PULLUP);
 }
 
 static inline void configure_usart2_pins(void)
 {
         u32 pin_mask = (1 << 26) | (1 << 27); /* RXD & TXD */
 
-        select_peripheral(PIOB, pin_mask, PERIPH_B, 0);
+        select_peripheral(PIOB, pin_mask, PERIPH_B, AT32_GPIOF_PULLUP);
 }
 
 static inline void configure_usart3_pins(void)
 {
         u32 pin_mask = (1 << 18) | (1 << 17); /* RXD & TXD */
 
-        select_peripheral(PIOB, pin_mask, PERIPH_B, 0);
+        select_peripheral(PIOB, pin_mask, PERIPH_B, AT32_GPIOF_PULLUP);
 }
 
 static struct platform_device *__initdata at32_usarts[4];