openwrt/target/linux/ar71xx/patches-4.14/505-MIPS-ath79-add-ath79_gpio_function_select.patch

--- a/arch/mips/ath79/common.h
+++ b/arch/mips/ath79/common.h
@@ -27,6 +27,7 @@ void ath79_ddr_ctrl_init(void);
 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_output_select(unsigned gpio, u8 val);
 void ath79_gpio_init(void);
 
 #endif /* __ATH79_COMMON_H */
--- a/arch/mips/ath79/gpio.c
+++ b/arch/mips/ath79/gpio.c
@@ -57,3 +57,26 @@ void ath79_gpio_function_disable(u32 mas
 {
 	ath79_gpio_function_setup(0, mask);
 }
+
+void __init ath79_gpio_output_select(unsigned gpio, u8 val)
+{
+	void __iomem *base = ath79_gpio_base;
+	unsigned int reg;
+	u32 t, s;
+
+	BUG_ON(!soc_is_ar934x());
+
+	if (gpio >= AR934X_GPIO_COUNT)
+		return;
+
+	reg = AR934X_GPIO_REG_OUT_FUNC0 + 4 * (gpio / 4);
+	s = 8 * (gpio % 4);
+
+	t = __raw_readl(base + reg);
+	t &= ~(0xff << s);
+	t |= val << s;
+	__raw_writel(t, base + reg);
+
+	/* flush write */
+	(void) __raw_readl(base + reg);
+}