diff --git a/src/mainboard/google/oak/mainboard.c b/src/mainboard/google/oak/mainboard.c
index c219678ae8..8dde2ef186 100644
--- a/src/mainboard/google/oak/mainboard.c
+++ b/src/mainboard/google/oak/mainboard.c
@@ -17,10 +17,59 @@
 #include <arch/io.h>
 #include <boardid.h>
 #include <boot/coreboot_tables.h>
+#include <delay.h>
 #include <device/device.h>
 
+#include <gpio.h>
+#include <soc/mt6391.h>
+#include <soc/mtcmos.h>
+#include <soc/pinmux.h>
+#include <soc/pll.h>
+
+static void configure_audio(void)
+{
+	mtcmos_audio_power_on();
+
+	/* regulator for codecs */
+	switch (board_id()) {
+	case 0:
+		/* vgp1 set to 1.22V */
+		mt6391_configure_ldo(LDO_VCAMD, LDO_1P22);
+		/* vgp4 set to 1.8V */
+		mt6391_configure_ldo(LDO_VGP4, LDO_1P8);
+		break;
+	default:
+		/* board from Rev1 */
+		/* vgp1 set to 1.8V */
+		mt6391_configure_ldo(LDO_VCAMD, LDO_1P8);
+		/* delay 1ms for realtek's power sequence request */
+		mdelay(1);
+		/* vcama set to 1.8V */
+		mt6391_configure_ldo(LDO_VCAMA, LDO_1P8);
+		break;
+	}
+
+	/* reset ALC5676 */
+	gpio_output(PAD_LCM_RST, 1);
+
+	/* SoC I2S */
+	gpio_set_mode(PAD_I2S0_LRCK, PAD_I2S0_LRCK_FUNC_I2S1_WS);
+	gpio_set_mode(PAD_I2S0_BCK, PAD_I2S0_BCK_FUNC_I2S1_BCK);
+	gpio_set_mode(PAD_I2S0_MCK, PAD_I2S0_MCK_FUNC_I2S1_MCK);
+	gpio_set_mode(PAD_I2S0_DATA0, PAD_I2S0_DATA0_FUNC_I2S1_DO_1);
+	gpio_set_mode(PAD_I2S0_DATA1, PAD_I2S0_DATA1_FUNC_I2S2_DI_2);
+
+	/* codec ext MCLK ON */
+	mt6391_gpio_output(MT6391_KP_COL4, 1);
+	mt6391_gpio_output(MT6391_KP_COL5, 1);
+
+	/* set I2S clock to 48KHz */
+	mt_pll_set_aud_div(48 * KHz);
+}
+
 static void mainboard_init(device_t dev)
 {
+	configure_audio();
 }
 
 static void mainboard_enable(device_t dev)