diff --git a/target/linux/mediatek/files-5.4/sound/soc/codecs/si3218x-spi.c b/target/linux/mediatek/files-5.4/sound/soc/codecs/si3218x-spi.c
new file mode 100644
index 0000000..e39af93
--- /dev/null
+++ b/target/linux/mediatek/files-5.4/sound/soc/codecs/si3218x-spi.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2023 MediaTek Inc.
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/spi/spi.h>
+
+/* alsa sound header */
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+
+#include "si3218x/si3218x.h"
+
+enum si3218x_spi_type {
+	MTK_EXT_PROSLIC = 0,
+	MTK_EXT_TYPE_NUM
+};
+
+struct mtk_ext_spi_ctrl {
+	int (*spi_probe)(struct spi_device *spi, struct spi_driver *spi_drv);
+	int (*spi_remove)(struct spi_device *spi);
+	const char *stream_name;
+	const char *codec_dai_name;
+	const char *codec_name;
+};
+
+static struct mtk_ext_spi_ctrl mtk_ext_list[MTK_EXT_TYPE_NUM] = {
+	[MTK_EXT_PROSLIC] = {
+		.spi_probe = si3218x_spi_probe,
+		.spi_remove = si3218x_spi_remove,
+	},
+};
+
+static unsigned int mtk_ext_type;
+
+static int mtk_ext_spi_probe(struct spi_device *spi);
+static int mtk_ext_spi_remove(struct spi_device *spi)
+{
+	dev_info(&spi->dev, "%s()\n", __func__);
+
+	if (mtk_ext_list[mtk_ext_type].spi_remove)
+		mtk_ext_list[mtk_ext_type].spi_remove(spi);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_ext_match_table[] = {
+	{.compatible = "silabs,proslic_spi" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_ext_match_table);
+
+static struct spi_driver mtk_ext_spi_driver = {
+	.driver = {
+		.name = "proslic_spi",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(mtk_ext_match_table),
+	},
+	.probe = mtk_ext_spi_probe,
+	.remove = mtk_ext_spi_remove,
+};
+
+module_spi_driver(mtk_ext_spi_driver);
+
+static int mtk_ext_spi_probe(struct spi_device *spi)
+{
+	int i, ret = 0;
+
+	dev_err(&spi->dev, "%s()\n", __func__);
+
+	mtk_ext_type = MTK_EXT_PROSLIC;
+	for (i = 0; i < MTK_EXT_TYPE_NUM; i++) {
+		if (!mtk_ext_list[i].spi_probe)
+			continue;
+
+		ret = mtk_ext_list[i].spi_probe(spi, &mtk_ext_spi_driver);
+		if (ret)
+			continue;
+
+		mtk_ext_type = i;
+		break;
+	}
+
+	return ret;
+}