--- /dev/null
+Add access to the function2 gpio register. This probably has to be
+converted into a pimux driver later on. This is needed for some setup
+functions on the Arduino Yun.
+
+--- a/arch/mips/ath79/common.h
++++ b/arch/mips/ath79/common.h
+@@ -27,6 +27,7 @@ void ath79_ddr_wb_flush(unsigned int reg
+ void ath79_gpio_function_enable(u32 mask);
+ void ath79_gpio_function_disable(u32 mask);
+ void ath79_gpio_function_setup(u32 set, u32 clear);
++void ath79_gpio_function2_setup(u32 set, u32 clear);
+ void ath79_gpio_output_select(unsigned gpio, u8 val);
+ int ath79_gpio_direction_select(unsigned gpio, bool oe);
+ void ath79_gpio_init(void);
+--- a/arch/mips/ath79/gpio.c
++++ b/arch/mips/ath79/gpio.c
+@@ -193,6 +193,36 @@ static void __iomem *ath79_gpio_get_func
+ return ath79_gpio_base + reg;
+ }
+
++static void __iomem *ath79_gpio_get_function2_reg(void)
++{
++ u32 reg = 0;
++
++ if (soc_is_ar71xx() ||
++ soc_is_ar724x() ||
++ soc_is_ar913x() ||
++ soc_is_ar933x())
++ reg = AR71XX_GPIO_REG_FUNC_2;
++ else
++ BUG();
++
++ return ath79_gpio_base + reg;
++}
++
++
++void ath79_gpio_function2_setup(u32 set, u32 clear)
++{
++ void __iomem *reg = ath79_gpio_get_function2_reg();
++ unsigned long flags;
++
++ spin_lock_irqsave(&ath79_gpio_lock, flags);
++
++ __raw_writel((__raw_readl(reg) & ~clear) | set, reg);
++ /* flush write */
++ __raw_readl(reg);
++
++ spin_unlock_irqrestore(&ath79_gpio_lock, flags);
++}
++
+ void ath79_gpio_function_setup(u32 set, u32 clear)
+ {
+ void __iomem *reg = ath79_gpio_get_function_reg();
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+@@ -840,6 +840,7 @@
+ #define AR71XX_GPIO_REG_INT_PENDING 0x20
+ #define AR71XX_GPIO_REG_INT_ENABLE 0x24
+ #define AR71XX_GPIO_REG_FUNC 0x28
++#define AR71XX_GPIO_REG_FUNC_2 0x30
+
+ #define AR934X_GPIO_REG_OUT_FUNC0 0x2c
+ #define AR934X_GPIO_REG_OUT_FUNC1 0x30
+@@ -964,6 +965,8 @@
+ #define AR724X_GPIO_FUNC_UART_EN BIT(1)
+ #define AR724X_GPIO_FUNC_JTAG_DISABLE BIT(0)
+
++#define AR933X_GPIO_FUNC2_JUMPSTART_DISABLE BIT(9)
++
+ #define AR913X_GPIO_FUNC_WMAC_LED_EN BIT(22)
+ #define AR913X_GPIO_FUNC_EXP_PORT_CS_EN BIT(21)
+ #define AR913X_GPIO_FUNC_I2S_REFCLKEN BIT(20)