diff --git a/src/soc/mediatek/mt8186/Makefile.inc b/src/soc/mediatek/mt8186/Makefile.inc
index a68d051..cb07ac0 100644
--- a/src/soc/mediatek/mt8186/Makefile.inc
+++ b/src/soc/mediatek/mt8186/Makefile.inc
@@ -6,14 +6,14 @@
 bootblock-y += ../common/gpio.c gpio.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/pll.c pll.c
-bootblock-$(CONFIG_SPI_FLASH) += spi.c
+bootblock-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 bootblock-y += ../common/timer.c timer.c
 bootblock-y += ../common/uart.c
 bootblock-y += ../common/wdt.c wdt.c
 
 verstage-y += ../common/flash_controller.c
 verstage-y += ../common/gpio.c gpio.c
-verstage-$(CONFIG_SPI_FLASH) += spi.c
+verstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 verstage-y += ../common/timer.c timer.c
 verstage-y += ../common/uart.c
 verstage-y += ../common/wdt.c wdt.c
@@ -22,7 +22,7 @@
 romstage-y += emi.c
 romstage-y += ../common/flash_controller.c
 romstage-y += ../common/gpio.c gpio.c
-romstage-$(CONFIG_SPI_FLASH) += spi.c
+romstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 romstage-y += ../common/timer.c timer.c
 romstage-y += ../common/uart.c
 romstage-y += ../common/wdt.c wdt.c
@@ -30,7 +30,7 @@
 ramstage-y += emi.c
 ramstage-y += ../common/flash_controller.c
 ramstage-y += ../common/gpio.c gpio.c
-ramstage-$(CONFIG_SPI_FLASH) += spi.c
+ramstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 ramstage-y += soc.c
 ramstage-y += ../common/timer.c timer.c
 ramstage-y += ../common/uart.c
diff --git a/src/soc/mediatek/mt8186/include/soc/spi.h b/src/soc/mediatek/mt8186/include/soc/spi.h
index fbf3995..15e7b91 100644
--- a/src/soc/mediatek/mt8186/include/soc/spi.h
+++ b/src/soc/mediatek/mt8186/include/soc/spi.h
@@ -8,7 +8,22 @@
 #ifndef MTK_MT8186_SPI_H
 #define MTK_MT8186_SPI_H
 
-#include <spi-generic.h>
+#include <soc/spi_common.h>
+
+#define SPI_BUS_NUMBER 6
+
+#define GET_SCK_REG(x) x->spi_cfg2_reg
+
+DEFINE_BITFIELD(SPI_CFG_CS_HOLD, 15, 0)
+DEFINE_BITFIELD(SPI_CFG_CS_SETUP, 31, 16)
+
+DEFINE_BITFIELD(SPI_CFG_SCK_LOW, 15, 0)
+DEFINE_BITFIELD(SPI_CFG_SCK_HIGH, 31, 16)
+
+DEFINE_BITFIELD(SPI_CFG1_CS_IDLE, 7, 0)
+DEFINE_BITFIELD(SPI_CFG1_PACKET_LOOP, 15, 8)
+DEFINE_BITFIELD(SPI_CFG1_PACKET_LENGTH, 28, 16)
+DEFINE_BITFIELD(SPI_CFG1_TICK_DLY, 31, 29)
 
 enum {
 	SPI_NOR_GPIO_SET0 = 0,
diff --git a/src/soc/mediatek/mt8186/spi.c b/src/soc/mediatek/mt8186/spi.c
index 4a1c13c..87f669d 100644
--- a/src/soc/mediatek/mt8186/spi.c
+++ b/src/soc/mediatek/mt8186/spi.c
@@ -7,17 +7,116 @@
 
 #include <assert.h>
 #include <device/mmio.h>
+#include <spi_flash.h>
 #include <soc/addressmap.h>
 #include <soc/flash_controller_common.h>
 #include <soc/gpio.h>
 #include <soc/spi.h>
 
+struct mtk_spi_bus spi_bus[SPI_BUS_NUMBER] = {
+	{
+		.regs = (void *)SPI0_BASE,
+		.cs_gpio = GPIO(SPI0_CSB),
+	},
+	{
+		.regs = (void *)SPI1_BASE,
+		.cs_gpio = GPIO(SPI1_CSB),
+	},
+	{
+		.regs = (void *)SPI2_BASE,
+		.cs_gpio = GPIO(SPI2_CSB),
+	},
+	{
+		.regs = (void *)SPI3_BASE,
+		.cs_gpio = GPIO(SPI3_CSB),
+	},
+	{
+		.regs = (void *)SPI4_BASE,
+		.cs_gpio = GPIO(EINT11),
+	},
+	{
+		.regs = (void *)SPI5_BASE,
+		.cs_gpio = GPIO(SPI5_CSB),
+	}
+};
+
 struct pad_func {
 	gpio_t gpio;
 	u8 func;
 };
 
 #define PAD_FUNC(name, func) {GPIO(name), PAD_##name##_FUNC_##func}
+#define PAD_FUNC_GPIO(name) {GPIO(name), 0}
+
+static const struct pad_func pad0_funcs[SPI_BUS_NUMBER][4] = {
+	{
+		PAD_FUNC(SPI0_MI, SPI0_MI_A),
+		PAD_FUNC_GPIO(SPI0_CSB),
+		PAD_FUNC(SPI0_MO, SPI0_MO_A),
+		PAD_FUNC(SPI0_CLK, SPI0_CLK_A),
+	},
+	{
+		PAD_FUNC(SPI1_MI, SPI1_MI_A),
+		PAD_FUNC_GPIO(SPI1_CSB),
+		PAD_FUNC(SPI1_MO, SPI1_MO_A),
+		PAD_FUNC(SPI1_CLK, SPI1_CLK_A),
+	},
+	{
+		PAD_FUNC(SPI2_MI, SPI2_MI_A),
+		PAD_FUNC_GPIO(SPI2_CSB),
+		PAD_FUNC(SPI2_MO, SPI2_MO_A),
+		PAD_FUNC(SPI2_CK, SPI2_CLK_A),
+	},
+	{
+		PAD_FUNC(SPI3_MI, SPI3_MI),
+		PAD_FUNC_GPIO(SPI3_CSB),
+		PAD_FUNC(SPI3_MO, SPI3_MO),
+		PAD_FUNC(SPI3_CLK, SPI3_CLK),
+	},
+	{
+		PAD_FUNC(EINT13, SPI4_MI_A),
+		PAD_FUNC_GPIO(EINT11),
+		PAD_FUNC(EINT12, SPI4_MO_A),
+		PAD_FUNC(EINT10, SPI4_CLK_A),
+	},
+	{
+		PAD_FUNC(SPI5_MI, SPI5_MI),
+		PAD_FUNC_GPIO(SPI5_CSB),
+		PAD_FUNC(SPI5_MO, SPI5_MO),
+		PAD_FUNC(SPI5_CLK, SPI5_CLK),
+	},
+};
+
+static const struct pad_func pad1_funcs[SPI_BUS_NUMBER][4] = {
+	{
+		PAD_FUNC(EINT3, SPI0_MI_B),
+		PAD_FUNC_GPIO(EINT1),
+		PAD_FUNC(EINT2, SPI0_MO_B),
+		PAD_FUNC(EINT0, SPI0_CLK_B),
+	},
+	{
+		PAD_FUNC(EINT9, SPI1_MI_B),
+		PAD_FUNC_GPIO(EINT7),
+		PAD_FUNC(EINT8, SPI1_MO_B),
+		PAD_FUNC(EINT6, SPI1_CLK_B),
+	},
+	{
+		PAD_FUNC(CAM_PDN1, SPI2_MI_B),
+		PAD_FUNC_GPIO(CAM_PDN0),
+		PAD_FUNC(CAM_RST0, SPI2_MO_B),
+		PAD_FUNC(EINT18, SPI2_CLK_B),
+	},
+	{
+	},
+	{
+		PAD_FUNC(I2S2_DI, SPI4_MI_B),
+		PAD_FUNC_GPIO(I2S2_BCK),
+		PAD_FUNC(I2S2_LRCK, SPI4_MO_B),
+		PAD_FUNC(I2S2_MCK, SPI4_CLK_B),
+	},
+	{
+	},
+};
 
 static const struct pad_func nor_pinmux[SPI_NOR_GPIO_SET_NUM][4] = {
 	/* GPIO 36 ~ 39 */
@@ -49,6 +148,22 @@
 	}
 }
 
+void mtk_spi_set_gpio_pinmux(unsigned int bus, enum spi_pad_mask pad_select)
+{
+	assert(bus < SPI_BUS_NUMBER);
+	const struct pad_func *ptr;
+
+	if (pad_select == SPI_PAD0_MASK) {
+		ptr = pad0_funcs[bus];
+	} else {
+		assert((bus == 0 || bus == 1 || bus == 2 || bus == 4) &&
+		       pad_select == SPI_PAD1_MASK);
+		ptr = pad1_funcs[bus];
+	}
+	for (int i = 0; i < 4; i++)
+		gpio_set_mode(ptr[i].gpio, ptr[i].func);
+}
+
 static const struct spi_ctrlr spi_flash_ctrlr = {
 	.max_xfer_size = 65535,
 	.flash_probe = mtk_spi_flash_probe,
@@ -56,6 +171,11 @@
 
 const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
 	{
+		.ctrlr = &spi_ctrlr,
+		.bus_start = 0,
+		.bus_end = SPI_BUS_NUMBER - 1,
+	},
+	{
 		.ctrlr = &spi_flash_ctrlr,
 		.bus_start = CONFIG_BOOT_DEVICE_SPI_FLASH_BUS,
 		.bus_end = CONFIG_BOOT_DEVICE_SPI_FLASH_BUS,