diff --git a/src/mainboard/google/asurada/mainboard.c b/src/mainboard/google/asurada/mainboard.c
index 358717b690..6a0d433ca4 100644
--- a/src/mainboard/google/asurada/mainboard.c
+++ b/src/mainboard/google/asurada/mainboard.c
@@ -83,7 +83,7 @@ static bool configure_display(void)
 	printk(BIOS_INFO, "%s: Starting display init\n", __func__);
 
 	configure_backlight_and_bridge();
-	mtk_i2c_bus_init(i2c_bus);
+	mtk_i2c_bus_init(i2c_bus, I2C_SPEED_FAST);
 
 	if (anx7625_init(i2c_bus)) {
 		printk(BIOS_ERR, "%s: Can't init ANX7625 bridge\n", __func__);
diff --git a/src/mainboard/google/kukui/boardid.c b/src/mainboard/google/kukui/boardid.c
index 117475680f..a15f6d08c9 100644
--- a/src/mainboard/google/kukui/boardid.c
+++ b/src/mainboard/google/kukui/boardid.c
@@ -128,7 +128,7 @@ static uint8_t wfc_id(void)
 		[1] = 0x5035,  /* GC5035 */
 	};
 
-	mtk_i2c_bus_init(bus);
+	mtk_i2c_bus_init(bus, I2C_SPEED_FAST);
 
 	/* Turn on camera sensor EEPROM */
 	pwrap_write(PMIC_LDO_VCAMIO_CON0, 0x1);
diff --git a/src/mainboard/google/kukui/panel_anx7625.c b/src/mainboard/google/kukui/panel_anx7625.c
index 90a041b42a..45cf27c64c 100644
--- a/src/mainboard/google/kukui/panel_anx7625.c
+++ b/src/mainboard/google/kukui/panel_anx7625.c
@@ -60,7 +60,7 @@ struct panel_description *get_panel_description(int panel_id)
 	/* To read panel EDID, we have to first power on anx7625. */
 	power_on_anx7625();
 
-	mtk_i2c_bus_init(ANX7625_I2C_BUS);
+	mtk_i2c_bus_init(ANX7625_I2C_BUS, I2C_SPEED_FAST);
 
 	if (anx7625_init(ANX7625_I2C_BUS)) {
 		printk(BIOS_ERR, "Can't init ANX7625 bridge.\n");
diff --git a/src/mainboard/google/kukui/panel_ps8640.c b/src/mainboard/google/kukui/panel_ps8640.c
index c4e90ea81c..c1e8c4cc2c 100644
--- a/src/mainboard/google/kukui/panel_ps8640.c
+++ b/src/mainboard/google/kukui/panel_ps8640.c
@@ -49,7 +49,7 @@ struct panel_description *get_panel_description(int panel_id)
 	power_on_ps8640();
 
 	u8 i2c_bus = 4, i2c_addr = 0x08;
-	mtk_i2c_bus_init(i2c_bus);
+	mtk_i2c_bus_init(i2c_bus, I2C_SPEED_FAST);
 
 	ps8640_init(i2c_bus, i2c_addr);
 	struct edid *edid = &ps8640_data.edid;
diff --git a/src/mainboard/google/oak/bootblock.c b/src/mainboard/google/oak/bootblock.c
index dd3d7a362a..365b80311e 100644
--- a/src/mainboard/google/oak/bootblock.c
+++ b/src/mainboard/google/oak/bootblock.c
@@ -70,7 +70,7 @@ void bootblock_mainboard_init(void)
 		gpio_output(GPIO(SRCLKENAI2), 1);
 
 	/* Init i2c bus 2 Timing register for TPM */
-	mtk_i2c_bus_init(CONFIG_DRIVER_TPM_I2C_BUS);
+	mtk_i2c_bus_init(CONFIG_DRIVER_TPM_I2C_BUS, I2C_SPEED_FAST);
 
 	mtk_spi_init(CONFIG_EC_GOOGLE_CHROMEEC_SPI_BUS, SPI_PAD1_MASK, 6*MHz,
 		     0);
diff --git a/src/mainboard/google/oak/mainboard.c b/src/mainboard/google/oak/mainboard.c
index 55ef91aad1..9c8481f621 100644
--- a/src/mainboard/google/oak/mainboard.c
+++ b/src/mainboard/google/oak/mainboard.c
@@ -26,7 +26,7 @@ enum {
 
 static void configure_ext_buck(void)
 {
-	mtk_i2c_bus_init(EXT_BUCK_I2C_BUS);
+	mtk_i2c_bus_init(EXT_BUCK_I2C_BUS, I2C_SPEED_FAST);
 
 	switch (board_id() + CONFIG_BOARD_ID_ADJUSTMENT) {
 	case 3:
@@ -97,7 +97,7 @@ static void configure_audio(void)
 	}
 
 	/* Init i2c bus Timing register for audio codecs */
-	mtk_i2c_bus_init(CODEC_I2C_BUS);
+	mtk_i2c_bus_init(CODEC_I2C_BUS, I2C_SPEED_FAST);
 
 	/* set I2S clock to 48KHz */
 	mt_pll_set_aud_div(48 * KHz);
@@ -193,7 +193,7 @@ static int read_edid_from_ps8640(struct edid *edid)
 		i2c_addr = 0x18;
 	}
 
-	mtk_i2c_bus_init(i2c_bus);
+	mtk_i2c_bus_init(i2c_bus, I2C_SPEED_FAST);
 
 	ps8640_init(i2c_bus, i2c_addr);
 	if (ps8640_get_edid(i2c_bus, i2c_addr, edid)) {
diff --git a/src/soc/mediatek/common/i2c_common.c b/src/soc/mediatek/common/i2c_common.c
new file mode 100644
index 0000000000..d68fb87e53
--- /dev/null
+++ b/src/soc/mediatek/common/i2c_common.c
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/i2c.h>
+#include <soc/i2c_common.h>
+#include <device/i2c_simple.h>
+
+void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
+{
+	mtk_i2c_speed_init(bus, speed);
+	mtk_i2c_set_gpio_pinmux(bus);
+}
+
+void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
+{
+	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
+	       read32(&regs->ltiming),
+	       read32(&regs->clock_div));
+}
+
+void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
+{
+	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
+	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
+	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
+	write32(&regs->hs, bus_ctrl->ac_timing.hs);
+	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
+}
diff --git a/src/soc/mediatek/common/include/soc/i2c_common.h b/src/soc/mediatek/common/include/soc/i2c_common.h
index 63eef92f27..d59fcce2d2 100644
--- a/src/soc/mediatek/common/include/soc/i2c_common.h
+++ b/src/soc/mediatek/common/include/soc/i2c_common.h
@@ -154,5 +154,7 @@ int mtk_i2c_calculate_speed(uint8_t bus, uint32_t clk_src,
 			    uint32_t *timing_sample_cnt);
 void mtk_i2c_speed_init(uint8_t bus, uint32_t speed);
 void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl);
+void mtk_i2c_set_gpio_pinmux(uint8_t bus);
+void mtk_i2c_bus_init(uint8_t bus, uint32_t speed);
 
 #endif
diff --git a/src/soc/mediatek/mt8173/i2c.c b/src/soc/mediatek/mt8173/i2c.c
index 9cd20cf465..a87dd0b5db 100644
--- a/src/soc/mediatek/mt8173/i2c.c
+++ b/src/soc/mediatek/mt8173/i2c.c
@@ -60,13 +60,14 @@ _Static_assert(ARRAY_SIZE(mtk_i2c_bus_controller) == I2C_BUS_NUMBER,
 #define I2CLOG(fmt, arg...)
 #endif /* CONFIG_DEBUG_I2C */
 
-void mtk_i2c_bus_init(uint8_t bus)
+void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
 {
 	uint8_t step_div;
 	uint32_t i2c_freq;
 	const uint8_t sample_div = 1;
 
 	assert(bus < ARRAY_SIZE(mtk_i2c_bus_controller));
+	assert(speed == I2C_SPEED_FAST);
 
 	/* Calculate i2c frequency */
 	step_div = DIV_ROUND_UP(I2C_CLK_HZ, (400 * KHz * sample_div * 2));
diff --git a/src/soc/mediatek/mt8173/include/soc/i2c.h b/src/soc/mediatek/mt8173/include/soc/i2c.h
index 02a21817d9..cc23f547ee 100644
--- a/src/soc/mediatek/mt8173/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8173/include/soc/i2c.h
@@ -42,6 +42,4 @@ struct mt_i2c_regs {
 
 check_member(mt_i2c_regs, debug_stat, 0x64);
 
-void mtk_i2c_bus_init(uint8_t bus);
-
 #endif /* SOC_MEDIATEK_MT8173_I2C_H */
diff --git a/src/soc/mediatek/mt8183/i2c.c b/src/soc/mediatek/mt8183/i2c.c
index c23377e8af..36354d2809 100644
--- a/src/soc/mediatek/mt8183/i2c.c
+++ b/src/soc/mediatek/mt8183/i2c.c
@@ -84,7 +84,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 	},
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -122,8 +122,9 @@ static void mtk_i2c_speed_init_soc(uint8_t bus)
 		clock_div - 1);
 }
 
-void mtk_i2c_bus_init(uint8_t bus)
+void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
 {
+	assert(speed == I2C_SPEED_FAST);
 	mtk_i2c_speed_init_soc(bus);
 	mtk_i2c_set_gpio_pinmux(bus);
 }
diff --git a/src/soc/mediatek/mt8183/include/soc/i2c.h b/src/soc/mediatek/mt8183/include/soc/i2c.h
index ebe75facce..237a182da9 100644
--- a/src/soc/mediatek/mt8183/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8183/include/soc/i2c.h
@@ -46,6 +46,4 @@ struct mt_i2c_regs {
 
 check_member(mt_i2c_regs, multi_dma, 0xf8c);
 
-void mtk_i2c_bus_init(uint8_t bus);
-
 #endif /* SOC_MEDIATEK_MT8183_I2C_H */
diff --git a/src/soc/mediatek/mt8186/Makefile.mk b/src/soc/mediatek/mt8186/Makefile.mk
index c6c47fdd92..4e0526c0e5 100644
--- a/src/soc/mediatek/mt8186/Makefile.mk
+++ b/src/soc/mediatek/mt8186/Makefile.mk
@@ -5,7 +5,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8186),y)
 all-y += ../common/cpu_id.c
 all-y += ../common/flash_controller.c
 all-y += ../common/gpio_eint_v1.c ../common/gpio.c ../common/gpio_op.c  gpio.c
-all-y += ../common/i2c.c i2c.c
+all-y += ../common/i2c.c ../common/i2c_common.c i2c.c
 all-y += ../common/pll.c pll.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 all-y += ../common/timer.c ../common/timer_prepare.c
diff --git a/src/soc/mediatek/mt8186/i2c.c b/src/soc/mediatek/mt8186/i2c.c
index 536627583e..64506a625e 100644
--- a/src/soc/mediatek/mt8186/i2c.c
+++ b/src/soc/mediatek/mt8186/i2c.c
@@ -101,7 +101,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 	},
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -111,25 +111,3 @@ static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 		gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
 	}
 }
-
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
-{
-	mtk_i2c_speed_init(bus, speed);
-	mtk_i2c_set_gpio_pinmux(bus);
-}
-
-void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
-{
-	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
-	       read32(&regs->ltiming),
-	       read32(&regs->clock_div));
-}
-
-void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
-{
-	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
-	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
-	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
-	write32(&regs->hs, bus_ctrl->ac_timing.hs);
-	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
-}
diff --git a/src/soc/mediatek/mt8186/include/soc/i2c.h b/src/soc/mediatek/mt8186/include/soc/i2c.h
index 4024e7de6b..28da112efc 100644
--- a/src/soc/mediatek/mt8186/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8186/include/soc/i2c.h
@@ -65,6 +65,4 @@ enum {
 
 check_member(mt_i2c_regs, multi_dma, 0xf8c);
 
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed);
-
 #endif /* SOC_MEDIATEK_MT8186_I2C_H */
diff --git a/src/soc/mediatek/mt8188/Makefile.mk b/src/soc/mediatek/mt8188/Makefile.mk
index dc6b649299..e28c50d02e 100644
--- a/src/soc/mediatek/mt8188/Makefile.mk
+++ b/src/soc/mediatek/mt8188/Makefile.mk
@@ -3,7 +3,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8188),y)
 
 all-y += ../common/flash_controller.c
 all-y += ../common/gpio_eint_v1.c ../common/gpio.c ../common/gpio_op.c gpio.c
-all-y += ../common/i2c.c i2c.c
+all-y += ../common/i2c.c ../common/i2c_common.c i2c.c
 all-y += ../common/pll.c pll.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 all-y += timer.c ../common/timer_prepare.c
diff --git a/src/soc/mediatek/mt8188/i2c.c b/src/soc/mediatek/mt8188/i2c.c
index edfe510202..6aae8fbc53 100644
--- a/src/soc/mediatek/mt8188/i2c.c
+++ b/src/soc/mediatek/mt8188/i2c.c
@@ -84,7 +84,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 	},
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -94,25 +94,3 @@ static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 		gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
 	}
 }
-
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
-{
-	mtk_i2c_speed_init(bus, speed);
-	mtk_i2c_set_gpio_pinmux(bus);
-}
-
-void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
-{
-	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
-	       read32(&regs->ltiming),
-	       read32(&regs->clock_div));
-}
-
-void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
-{
-	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
-	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
-	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
-	write32(&regs->hs, bus_ctrl->ac_timing.hs);
-	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
-}
diff --git a/src/soc/mediatek/mt8188/include/soc/i2c.h b/src/soc/mediatek/mt8188/include/soc/i2c.h
index 104da9a7be..615660bde8 100644
--- a/src/soc/mediatek/mt8188/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8188/include/soc/i2c.h
@@ -69,6 +69,4 @@ enum {
 
 check_member(mt_i2c_regs, dma_nreq, 0xf94);
 
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed);
-
 #endif /* SOC_MEDIATEK_MT8188_I2C_H */
diff --git a/src/soc/mediatek/mt8192/i2c.c b/src/soc/mediatek/mt8192/i2c.c
index 3e8c21e30a..278972a6e7 100644
--- a/src/soc/mediatek/mt8192/i2c.c
+++ b/src/soc/mediatek/mt8192/i2c.c
@@ -109,7 +109,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 	},
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -169,8 +169,9 @@ static void mtk_i2c_speed_init_soc(uint8_t bus)
 	write32(&mtk_i2c_bus_controller[bus].i2c_regs->ext_conf, I2C_FS_START_CON);
 }
 
-void mtk_i2c_bus_init(uint8_t bus)
+void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
 {
+	assert(speed == I2C_SPEED_FAST);
 	mtk_i2c_speed_init_soc(bus);
 	mtk_i2c_set_gpio_pinmux(bus);
 }
diff --git a/src/soc/mediatek/mt8192/include/soc/i2c.h b/src/soc/mediatek/mt8192/include/soc/i2c.h
index fbf41e6c48..45d664e325 100644
--- a/src/soc/mediatek/mt8192/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8192/include/soc/i2c.h
@@ -46,6 +46,4 @@ struct mt_i2c_regs {
 
 check_member(mt_i2c_regs, multi_dma, 0xf8c);
 
-void mtk_i2c_bus_init(uint8_t bus);
-
 #endif /* SOC_MEDIATEK_MT8192_I2C_H */
diff --git a/src/soc/mediatek/mt8195/Makefile.mk b/src/soc/mediatek/mt8195/Makefile.mk
index c460d5894f..5e4e98f121 100644
--- a/src/soc/mediatek/mt8195/Makefile.mk
+++ b/src/soc/mediatek/mt8195/Makefile.mk
@@ -4,7 +4,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8195),y)
 # for bootblock, verstage, romstage, ramstage
 all-y += ../common/flash_controller.c
 all-y += ../common/gpio_eint_v1.c ../common/gpio.c ../common/gpio_op.c gpio.c
-all-y += ../common/i2c.c i2c.c
+all-y += ../common/i2c.c ../common/i2c_common.c i2c.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
diff --git a/src/soc/mediatek/mt8195/i2c.c b/src/soc/mediatek/mt8195/i2c.c
index 1fa9608fb9..a9593fed19 100644
--- a/src/soc/mediatek/mt8195/i2c.c
+++ b/src/soc/mediatek/mt8195/i2c.c
@@ -89,7 +89,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -100,25 +100,3 @@ static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 			gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
 	}
 }
-
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
-{
-	mtk_i2c_speed_init(bus, speed);
-	mtk_i2c_set_gpio_pinmux(bus);
-}
-
-void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
-{
-	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
-	       read32(&regs->ltiming),
-	       read32(&regs->clock_div));
-}
-
-void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
-{
-	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
-	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
-	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
-	write32(&regs->hs, bus_ctrl->ac_timing.hs);
-	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
-}
diff --git a/src/soc/mediatek/mt8195/include/soc/i2c.h b/src/soc/mediatek/mt8195/include/soc/i2c.h
index e7ba71474d..64d77ef410 100644
--- a/src/soc/mediatek/mt8195/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8195/include/soc/i2c.h
@@ -59,6 +59,4 @@ enum {
 
 check_member(mt_i2c_regs, multi_dma, 0xf8c);
 
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed);
-
 #endif /* SOC_MEDIATEK_MT8195_I2C_H */
diff --git a/src/soc/mediatek/mt8196/Makefile.mk b/src/soc/mediatek/mt8196/Makefile.mk
index a1ee6fb304..5d6e1db74d 100644
--- a/src/soc/mediatek/mt8196/Makefile.mk
+++ b/src/soc/mediatek/mt8196/Makefile.mk
@@ -5,7 +5,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8196),y)
 all-y += ../common/flash_controller.c
 all-y += ../common/gpio.c ../common/gpio_op.c gpio.c
 all-y += ../common/gpio_eint_v2.c gpio_eint.c
-all-y += ../common/i2c.c i2c.c
+all-y += ../common/i2c.c ../common/i2c_common.c i2c.c
 all-y += ../common/pll.c pll.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 all-y += timer.c timer_prepare.c
diff --git a/src/soc/mediatek/mt8196/i2c.c b/src/soc/mediatek/mt8196/i2c.c
index c3d3ccb31c..21ae058fb8 100644
--- a/src/soc/mediatek/mt8196/i2c.c
+++ b/src/soc/mediatek/mt8196/i2c.c
@@ -156,7 +156,7 @@ static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
 	},
 };
 
-static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
+void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 {
 	assert(bus < I2C_BUS_NUMBER);
 
@@ -167,25 +167,3 @@ static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 		gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
 	}
 }
-
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
-{
-	mtk_i2c_speed_init(bus, speed);
-	mtk_i2c_set_gpio_pinmux(bus);
-}
-
-void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
-{
-	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
-	       read32(&regs->ltiming),
-	       read32(&regs->clock_div));
-}
-
-void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
-{
-	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
-	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
-	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
-	write32(&regs->hs, bus_ctrl->ac_timing.hs);
-	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
-}
diff --git a/src/soc/mediatek/mt8196/include/soc/i2c.h b/src/soc/mediatek/mt8196/include/soc/i2c.h
index 7dae2d804a..884902b2af 100644
--- a/src/soc/mediatek/mt8196/include/soc/i2c.h
+++ b/src/soc/mediatek/mt8196/include/soc/i2c.h
@@ -68,6 +68,4 @@ enum {
 
 check_member(mt_i2c_regs, fifo_thresh, 0xf8);
 
-void mtk_i2c_bus_init(uint8_t bus, uint32_t speed);
-
 #endif /* __SOC_MEDIATEK_MT8196_I2C_H__ */