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@@ -0,0 +1,55 @@
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+diff -Naur linux-4.7.3/arch/avr32/boards/grasshopper/setup.c linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/setup.c
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+--- linux-4.7.3/arch/avr32/boards/grasshopper/setup.c 2016-09-14 10:48:53.403638569 +0200
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+@@ -129,6 +129,28 @@
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+ };
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+ #endif
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+
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++/* I2C/TWI */
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++#ifdef CONFIG_I2C
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++static struct i2c_gpio_platform_data i2c_gpio_data = {
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++ .sda_pin = GPIO_PIN_PA(6),
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++ .scl_pin = GPIO_PIN_PA(7),
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++ .sda_is_open_drain = 1,
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++ .scl_is_open_drain = 1,
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++ .udelay = 2, /* close to 100 kHz */
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++};
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++
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++static struct platform_device i2c_gpio_device = {
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++ .name = "i2c-gpio",
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++ .id = 0,
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++ .dev = {
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++ .platform_data = &i2c_gpio_data,
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++ },
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++};
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++
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++static struct i2c_board_info i2c_info[] = {
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++};
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++#endif
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++
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+ /* MCI */
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+ #ifdef CONFIG_MMC_ATMELMCI
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+ static struct mci_platform_data __initdata mci0_data = {
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+@@ -168,6 +190,22 @@
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+ ATMEL_LCDC_PRI_CONTROL | ATMEL_LCDC_PRI_24BIT);
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+ #endif
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+
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++ // I2C / TWI
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++#ifdef CONFIG_I2C
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++ /* all these i2c/smbus pins should have external pullups for
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++ * open-drain sharing among all I2C devices. SDA and SCL do;
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++ * PB28/EXTINT3 doesn't; it should be SMBALERT# (for PMBus),
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++ * but it's not available off-board.
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++ */
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++ at32_select_periph(GPIO_PIOB_BASE, 1 << 28, 0, AT32_GPIOF_PULLUP);
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++ at32_select_gpio(i2c_gpio_data.sda_pin,
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++ AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
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++ at32_select_gpio(i2c_gpio_data.scl_pin,
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++ AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
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++ platform_device_register(&i2c_gpio_device);
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++ i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
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++#endif
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++
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+ #ifdef CONFIG_MMC_ATMELMCI
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+ // at32_add_device_mci(0, &mci0_data); /* MMC/SD */
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+ #endif
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Mario Haustein