4 files changed, 71 insertions, 0 deletions
diff --git a/src/drivers/i2c/gpiomux/Makefile.inc b/src/drivers/i2c/gpiomux/Makefile.inc
index fec8d5b00f..5c328cba40 100644
--- a/src/drivers/i2c/gpiomux/Makefile.inc
+++ b/src/drivers/i2c/gpiomux/Makefile.inc
@@ -1 +1,2 @@
 subdirs-$(CONFIG_DRIVERS_I2C_GPIO_MUX) += mux
+subdirs-$(CONFIG_DRIVERS_I2C_GPIO_MUX) += bus
diff --git a/src/drivers/i2c/gpiomux/bus/Makefile.inc b/src/drivers/i2c/gpiomux/bus/Makefile.inc
new file mode 100644
index 0000000000..1c462dc094
--- /dev/null
+++ b/src/drivers/i2c/gpiomux/bus/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_I2C_GPIO_MUX) += bus.c
diff --git a/src/drivers/i2c/gpiomux/bus/bus.c b/src/drivers/i2c/gpiomux/bus/bus.c
new file mode 100644
index 0000000000..66aef8e8c0
--- /dev/null
+++ b/src/drivers/i2c/gpiomux/bus/bus.c
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <stdlib.h>
+#include <string.h>
+#include "chip.h"
+
+static const char *i2c_gpiomux_bus_acpi_name(const struct device *dev)
+{
+	static char name[ACPI_NAME_BUFFER_SIZE];
+
+	snprintf(name, ACPI_NAME_BUFFER_SIZE, "MXA%01.1X", dev->path.generic.id);
+	return name;
+}
+
+static void i2c_gpiomux_bus_fill_ssdt(const struct device *dev)
+{
+	const char *scope = acpi_device_scope(dev);
+	const char *path = acpi_device_path(dev);
+
+	if (!dev || !dev->enabled || !scope || !path)
+		return;
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(acpi_device_name(dev));
+
+	acpigen_write_STA(acpi_device_status(dev));
+	acpigen_write_ADR(dev->path.generic.id);
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+
+	printk(BIOS_INFO, "%s: %s at %s\n", path, dev->chip_ops->name, dev_path(dev));
+}
+
+static struct device_operations i2c_gpiomux_bus_ops = {
+	.read_resources		= noop_read_resources,
+	.set_resources		= noop_set_resources,
+	.scan_bus		= scan_static_bus,
+	.acpi_name		= i2c_gpiomux_bus_acpi_name,
+	.acpi_fill_ssdt		= i2c_gpiomux_bus_fill_ssdt,
+};
+
+static void i2c_gpiomux_bus_enable(struct device *dev)
+{
+	if (!dev)
+		return;
+
+	dev->ops = &i2c_gpiomux_bus_ops;
+}
+
+struct chip_operations drivers_i2c_gpiomux_bus_ops = {
+	CHIP_NAME("I2C GPIO MUX Bus Device")
+	.enable_dev = i2c_gpiomux_bus_enable
+};
diff --git a/src/drivers/i2c/gpiomux/bus/chip.h b/src/drivers/i2c/gpiomux/bus/chip.h
new file mode 100644
index 0000000000..2baf334a6c
--- /dev/null
+++ b/src/drivers/i2c/gpiomux/bus/chip.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __I2C_GPIOMUX_BUS_CHIP_H__
+#define __I2C_GPIOMUX_BUS_CHIP_H__
+
+struct drivers_i2c_gpiomux_bus_config {
+};
+
+#endif /* __I2C_GPIOMUX_BUS_CHIP_H__ */