diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 269c31ce0814..18f489a3501b 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -2431,6 +2431,15 @@ config SND_SOC_WCD937X_SDW
 	  via soundwire.
 	  To compile this codec driver say Y or m.
 
+config SND_SOC_WCD9378_SDW
+	tristate "WCD9378 Codec - SDW (bring-up skeleton)"
+	depends on SOUNDWIRE
+	select REGMAP_SOUNDWIRE
+	help
+	  Bring-up skeleton driver for the Qualcomm WCD9378 audio codec
+	  connected via SoundWire, as found on SM7635 phones.
+	  To compile this codec driver say Y or m.
+
 config SND_SOC_WCD938X
 	depends on SND_SOC_WCD938X_SDW
 	tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 172861d17cfd..466d7bd1a514 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -356,6 +356,7 @@ snd-soc-wcd9335-y := wcd9335.o
 snd-soc-wcd934x-y := wcd934x.o
 snd-soc-wcd937x-y := wcd937x.o
 snd-soc-wcd937x-sdw-y := wcd937x-sdw.o
+snd-soc-wcd9378-sdw-y := wcd9378-sdw.o
 snd-soc-wcd938x-y := wcd938x.o
 snd-soc-wcd938x-sdw-y := wcd938x-sdw.o
 snd-soc-wcd939x-y := wcd939x.o
@@ -796,6 +797,7 @@ ifdef CONFIG_SND_SOC_WCD937X_SDW
 # avoid link failure by forcing sdw code built-in when needed
 obj-$(CONFIG_SND_SOC_WCD937X) += snd-soc-wcd937x-sdw.o
 endif
+obj-$(CONFIG_SND_SOC_WCD9378_SDW) += snd-soc-wcd9378-sdw.o
 obj-$(CONFIG_SND_SOC_WCD938X)	+= snd-soc-wcd938x.o
 ifdef CONFIG_SND_SOC_WCD938X_SDW
 # avoid link failure by forcing sdw code built-in when needed
diff --git a/sound/soc/codecs/wcd9378-sdw.c b/sound/soc/codecs/wcd9378-sdw.c
new file mode 100644
index 000000000000..e613f6277113
--- /dev/null
+++ b/sound/soc/codecs/wcd9378-sdw.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026, Jorijn van der Graaf
+ *
+ * SoundWire slave driver for the Qualcomm WCD9378 audio codec.
+ *
+ * Bring-up skeleton: binds to the two WCD9378 SoundWire devices (TX and
+ * RX), maps the SDCA control space through regmap and verifies the device
+ * identity registers. No audio paths yet.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/soundwire/sdw_type.h>
+
+#include "wcd9378.h"
+
+struct wcd9378_sdw_priv {
+	struct sdw_slave *sdev;
+	struct regmap *regmap;
+};
+
+static const struct regmap_config wcd9378_sdw_regmap_config = {
+	.name = "wcd9378_sdw",
+	.reg_bits = 32,
+	.val_bits = 8,
+	.cache_type = REGCACHE_NONE,
+	.max_register = WCD9378_MAX_REGISTER,
+};
+
+static void wcd9378_sdw_read_id(struct wcd9378_sdw_priv *wcd)
+{
+	struct device *dev = &wcd->sdev->dev;
+	static const struct {
+		const char *name;
+		unsigned int reg;
+	} id_regs[] = {
+		{ "DEV_MANU_ID_0", WCD9378_DEV_MANU_ID_0 },
+		{ "DEV_MANU_ID_1", WCD9378_DEV_MANU_ID_1 },
+		{ "DEV_PART_ID_0", WCD9378_DEV_PART_ID_0 },
+		{ "DEV_PART_ID_1", WCD9378_DEV_PART_ID_1 },
+		{ "DEV_VER",       WCD9378_DEV_VER },
+		{ "FUNC_EXT_ID_0", WCD9378_FUNC_EXT_ID_0 },
+		{ "FUNC_EXT_ID_1", WCD9378_FUNC_EXT_ID_1 },
+		{ "ANA_BIAS",      WCD9378_ANA_BIAS },
+		{ "ANA_TX_CH1",    WCD9378_ANA_TX_CH1 },
+		{ "ANA_MICB1",     WCD9378_ANA_MICB1 },
+		{ "SYS_USAGE_CTRL", WCD9378_SYS_USAGE_CTRL },
+	};
+	unsigned int val, packed, pval;
+	int i, ret, pret;
+
+	for (i = 0; i < ARRAY_SIZE(id_regs); i++) {
+		/* downstream WCD9378_REG() wire packing */
+		packed = ((id_regs[i].reg & 0x0ff00000) >> 8) |
+			 (id_regs[i].reg & 0xfff);
+
+		ret = regmap_read(wcd->regmap, id_regs[i].reg, &val);
+		pret = regmap_read(wcd->regmap, packed, &pval);
+		dev_info(dev, "%s: virt %#010x = %#04x (ret %d), packed %#07x = %#04x (ret %d)\n",
+			 id_regs[i].name,
+			 id_regs[i].reg, ret ? 0xdead : val, ret,
+			 packed, pret ? 0xdead : pval, pret);
+	}
+}
+
+static int wcd9378_sdw_update_status(struct sdw_slave *slave,
+				     enum sdw_slave_status status)
+{
+	struct wcd9378_sdw_priv *wcd = dev_get_drvdata(&slave->dev);
+
+	dev_info(&slave->dev, "status %d (dev_num %d)\n", status,
+		 slave->dev_num);
+
+	if (status == SDW_SLAVE_ATTACHED)
+		wcd9378_sdw_read_id(wcd);
+
+	return 0;
+}
+
+static const struct sdw_slave_ops wcd9378_sdw_ops = {
+	.update_status = wcd9378_sdw_update_status,
+};
+
+static int wcd9378_sdw_probe(struct sdw_slave *pdev,
+			     const struct sdw_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct wcd9378_sdw_priv *wcd;
+
+	wcd = devm_kzalloc(dev, sizeof(*wcd), GFP_KERNEL);
+	if (!wcd)
+		return -ENOMEM;
+
+	wcd->sdev = pdev;
+	dev_set_drvdata(dev, wcd);
+
+	pdev->prop.scp_int1_mask = SDW_SCP_INT1_IMPL_DEF |
+				   SDW_SCP_INT1_BUS_CLASH |
+				   SDW_SCP_INT1_PARITY;
+	pdev->prop.simple_clk_stop_capable = true;
+	/* The SDCA control space sits above the 16-bit address range */
+	pdev->prop.paging_support = true;
+
+	wcd->regmap = devm_regmap_init_sdw(pdev, &wcd9378_sdw_regmap_config);
+	if (IS_ERR(wcd->regmap))
+		return dev_err_probe(dev, PTR_ERR(wcd->regmap),
+				     "regmap init failed\n");
+
+	dev_info(dev, "wcd9378 sdw slave probed\n");
+
+	return 0;
+}
+
+static const struct sdw_device_id wcd9378_sdw_id[] = {
+	SDW_SLAVE_ENTRY(0x0217, 0x0110, 0),
+	{ },
+};
+MODULE_DEVICE_TABLE(sdw, wcd9378_sdw_id);
+
+static struct sdw_driver wcd9378_sdw_driver = {
+	.probe = wcd9378_sdw_probe,
+	.ops = &wcd9378_sdw_ops,
+	.id_table = wcd9378_sdw_id,
+	.driver = {
+		.name = "wcd9378-sdw",
+	},
+};
+module_sdw_driver(wcd9378_sdw_driver);
+
+MODULE_DESCRIPTION("WCD9378 SoundWire slave driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/wcd9378.h b/sound/soc/codecs/wcd9378.h
new file mode 100644
index 000000000000..380786f2765e
--- /dev/null
+++ b/sound/soc/codecs/wcd9378.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2026, Jorijn van der Graaf
+ *
+ * Register map for the Qualcomm WCD9378 audio codec.
+ *
+ * The codec exposes its control registers in the SoundWire SDCA control
+ * address space (bit 30 set, SDCA function number in bits 25:22), accessed
+ * through the TX SoundWire slave. The analog core registers (function 0,
+ * implementation-defined region at +0x180000) are layout-compatible with
+ * the WCD937x family.
+ */
+
+#ifndef __WCD9378_H__
+#define __WCD9378_H__
+
+#include <linux/regmap.h>
+#include <sound/soc.h>
+
+/* SDCA function 0 (extension unit): device identity */
+#define WCD9378_FUNC_EXT_ID_0			0x40000048
+#define WCD9378_FUNC_EXT_ID_1			0x40000049
+#define WCD9378_FUNC_EXT_VER			0x40000050
+#define WCD9378_FUNC_STAT			0x40080000
+#define WCD9378_DEV_MANU_ID_0			0x40100060
+#define WCD9378_DEV_MANU_ID_1			0x40100061
+#define WCD9378_DEV_PART_ID_0			0x40100068
+#define WCD9378_DEV_PART_ID_1			0x40100069
+#define WCD9378_DEV_VER				0x40100070
+
+/* Analog core (WCD937x-compatible layout), function 0 + 0x180000 */
+#define WCD9378_ANA_PAGE			0x40180000
+#define WCD9378_ANA_BIAS			0x40180001
+#define WCD9378_ANA_RX_SUPPLIES			0x40180008
+#define WCD9378_ANA_TX_CH1			0x4018000e
+#define WCD9378_ANA_TX_CH2			0x4018000f
+#define WCD9378_ANA_TX_CH3			0x40180010
+#define WCD9378_ANA_MICB1			0x40180022
+#define WCD9378_ANA_MICB2			0x40180023
+#define WCD9378_ANA_MICB2_RAMP			0x40180024
+#define WCD9378_ANA_MICB3			0x40180025
+
+/* Sequencer block (SEQR) */
+#define WCD9378_SYS_USAGE_CTRL			0x40180501
+#define WCD9378_SM0_MB_SEL			0x401805b0
+#define WCD9378_SM1_MB_SEL			0x401805b1
+#define WCD9378_SM2_MB_SEL			0x401805b2
+
+/* SDCA function activation (one per function) */
+#define WCD9378_SMP_AMP_FUNC_STAT		0x40880000
+#define WCD9378_SMP_AMP_FUNC_ACT		0x40880008
+#define WCD9378_SMP_JACK_FUNC_STAT		0x40c80000
+#define WCD9378_SMP_JACK_FUNC_ACT		0x40c80008
+#define WCD9378_SMP_MIC_CTRL0_FUNC_STAT		0x41080000
+#define WCD9378_SMP_MIC_CTRL0_FUNC_ACT		0x41080008
+#define WCD9378_SMP_MIC_CTRL1_FUNC_STAT		0x41480000
+#define WCD9378_SMP_MIC_CTRL1_FUNC_ACT		0x41480008
+#define WCD9378_SMP_MIC_CTRL2_FUNC_STAT		0x41880000
+#define WCD9378_SMP_MIC_CTRL2_FUNC_ACT		0x41880008
+
+#define WCD9378_MAX_REGISTER			0x41900070
+
+#endif /* __WCD9378_H__ */