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diff -Naur linux-4.7.3/arch/avr32/boards/grasshopper/Kconfig linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/Kconfig
--- linux-4.7.3/arch/avr32/boards/grasshopper/Kconfig 2016-09-20 11:43:03.645251779 +0200
+++ linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/Kconfig 2016-09-20 11:58:20.129642638 +0200
@@ -49,4 +49,21 @@
depends on I2C && I2C_GPIO
default y
+config BOARD_GRASSHOPPER_USART0
+ bool "Enable USART0"
+ depends on SERIAL_ATMEL_PDC
+ default n
+ help
+ USART0 is mapped to /dev/ttyS1 (or /dev/ttyAT1 resp.) and available via
+ connector J6 and J13.
+
+config BOARD_GRASSHOPPER_USART1
+ bool "Enable USART1 (CP2102 USB-Interface)"
+ depends on SERIAL_ATMEL_PDC
+ default y
+ help
+ USART1 is mapped to /dev/ttyS0 (or /dev/ttyAT0 resp.) and available via
+ the CP2002 USB-USART-bridge. If you disable this option, you won't be
+ able to access the serial console, so it is recommended to say 'y' here.
+
endif # BOARD_GRASSHOPPER
diff -Naur linux-4.7.3/arch/avr32/boards/grasshopper/setup.c linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/setup.c
--- linux-4.7.3/arch/avr32/boards/grasshopper/setup.c 2016-09-20 11:43:03.646251793 +0200
+++ linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/setup.c 2016-09-20 12:03:04.864496603 +0200
@@ -166,7 +166,12 @@
void __init setup_board(void)
{
+#ifdef CONFIG_BOARD_GRASSHOPPER_USART1
at32_map_usart(1, 0, 0); // USART 1: /dev/ttyS0, CP2102
+#endif
+#ifdef CONFIG_BOARD_GRASSHOPPER_USART0
+ at32_map_usart(0, 1, 0); // USART 0: /dev/ttyS1
+#endif
at32_setup_serial_console(0);
// grasshopper_add_spi();
@@ -182,7 +187,12 @@
*/
at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL);
at32_add_device_usba(0, NULL);
+#ifdef CONFIG_BOARD_GRASSHOPPER_USART1
at32_add_device_usart(0);
+#endif
+#ifdef CONFIG_BOARD_GRASSHOPPER_USART0
+ at32_add_device_usart(1);
+#endif
#ifdef CONFIG_GRASSHOPPER_LCD
at32_add_device_lcdc(0, &grasshopper_lcdc_data,
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