diff --git a/arch/arm/mach-rockchip/rk3308/rk3308.c b/arch/arm/mach-rockchip/rk3308/rk3308.c
index f27f9e8..b6815dd 100644
--- a/arch/arm/mach-rockchip/rk3308/rk3308.c
+++ b/arch/arm/mach-rockchip/rk3308/rk3308.c
@@ -72,6 +72,11 @@
 	UART2_IO_SEL_M1,
 	UART2_IO_SEL_USB,
 
+	GPIO2C0_SEL_SRC_CTRL_SHIFT	= 11,
+	GPIO2C0_SEL_SRC_CTRL_MASK	= BIT(11),
+	GPIO2C0_SEL_SRC_CTRL_IOMUX	= 0,
+	GPIO2C0_SEL_SRC_CTRL_SEL_PLUS,
+
 	GPIO3B3_SEL_SRC_CTRL_SHIFT	= 7,
 	GPIO3B3_SEL_SRC_CTRL_MASK	= BIT(7),
 	GPIO3B3_SEL_SRC_CTRL_IOMUX	= 0,
@@ -97,6 +102,18 @@
 	GPIO3B2_SEL_PLUS_EMMC_RSTN,
 	GPIO3B2_SEL_PLUS_SPI1_MISO,
 	GPIO3B2_SEL_PLUS_LCDC_D22_M1,
+
+	I2C3_IOFUNC_SRC_CTRL_SHIFT	= 10,
+	I2C3_IOFUNC_SRC_CTRL_MASK	= BIT(10),
+	I2C3_IOFUNC_SRC_CTRL_SEL_PLUS	= 1,
+
+	GPIO2A3_SEL_SRC_CTRL_SHIFT	= 7,
+	GPIO2A3_SEL_SRC_CTRL_MASK	= BIT(7),
+	GPIO2A3_SEL_SRC_CTRL_SEL_PLUS	= 1,
+
+	GPIO2A2_SEL_SRC_CTRL_SHIFT	= 3,
+	GPIO2A2_SEL_SRC_CTRL_MASK	= BIT(3),
+	GPIO2A2_SEL_SRC_CTRL_SEL_PLUS	= 1,
 };
 
 enum {
@@ -166,10 +183,30 @@
 int arch_cpu_init(void)
 {
 	static struct rk3308_sgrf * const sgrf = (void *)SGRF_BASE;
+	static struct rk3308_grf * const grf = (void *)GRF_BASE;
 
 	/* Set CRYPTO SDMMC EMMC NAND SFC USB master bus to be secure access */
 	rk_clrreg(&sgrf->con_secure0, 0x2b83);
 
+	/*
+	 * Enable plus options to use more pinctrl functions, including
+	 * GPIO2A2_PLUS, GPIO2A3_PLUS and I2C3_MULTI_SRC_PLUS.
+	 */
+	rk_clrsetreg(&grf->soc_con13,
+		     I2C3_IOFUNC_SRC_CTRL_MASK | GPIO2A3_SEL_SRC_CTRL_MASK |
+		     GPIO2A2_SEL_SRC_CTRL_MASK,
+		     I2C3_IOFUNC_SRC_CTRL_SEL_PLUS << I2C3_IOFUNC_SRC_CTRL_SHIFT |
+		     GPIO2A3_SEL_SRC_CTRL_SEL_PLUS << GPIO2A3_SEL_SRC_CTRL_SHIFT |
+		     GPIO2A2_SEL_SRC_CTRL_SEL_PLUS << GPIO2A2_SEL_SRC_CTRL_SHIFT);
+
+	/* Plus options about GPIO3B2_PLUS, GPIO3B3_PLUS and GPIO2C0_PLUS. */
+	rk_clrsetreg(&grf->soc_con15,
+		     GPIO2C0_SEL_SRC_CTRL_MASK | GPIO3B3_SEL_SRC_CTRL_MASK |
+		     GPIO3B2_SEL_SRC_CTRL_MASK,
+		     GPIO2C0_SEL_SRC_CTRL_SEL_PLUS << GPIO2C0_SEL_SRC_CTRL_SHIFT |
+		     GPIO3B3_SEL_SRC_CTRL_SEL_PLUS << GPIO3B3_SEL_SRC_CTRL_SHIFT |
+		     GPIO3B2_SEL_SRC_CTRL_SEL_PLUS << GPIO3B2_SEL_SRC_CTRL_SHIFT);
+
 	return 0;
 }
 #endif