4 files changed, 86 insertions, 0 deletions
diff --git a/src/drivers/generic/nau8315/Kconfig b/src/drivers/generic/nau8315/Kconfig
new file mode 100644
index 0000000000..64b12e6e33
--- /dev/null
+++ b/src/drivers/generic/nau8315/Kconfig
@@ -0,0 +1,3 @@
+config DRIVERS_GENERIC_NAU8315
+	bool
+	depends on HAVE_ACPI_TABLES
diff --git a/src/drivers/generic/nau8315/Makefile.inc b/src/drivers/generic/nau8315/Makefile.inc
new file mode 100644
index 0000000000..09641892e5
--- /dev/null
+++ b/src/drivers/generic/nau8315/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_GENERIC_NAU8315) += nau8315.c
diff --git a/src/drivers/generic/nau8315/chip.h b/src/drivers/generic/nau8315/chip.h
new file mode 100644
index 0000000000..aa194bb3e9
--- /dev/null
+++ b/src/drivers/generic/nau8315/chip.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_device.h>
+
+struct drivers_generic_nau8315_config {
+	/* ENABLE GPIO */
+	struct acpi_gpio enable_gpio;
+};
diff --git a/src/drivers/generic/nau8315/nau8315.c b/src/drivers/generic/nau8315/nau8315.c
new file mode 100644
index 0000000000..21b8ff9e17
--- /dev/null
+++ b/src/drivers/generic/nau8315/nau8315.c
@@ -0,0 +1,74 @@
+/* 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 <gpio.h>
+#include "chip.h"
+
+static void nau8315_fill_ssdt(const struct device *dev)
+{
+	struct drivers_generic_nau8315_config *config = dev->chip_info;
+	const char *path;
+	struct acpi_dp *dp;
+
+	if (!dev->enabled || !config)
+		return;
+
+	const char *scope = acpi_device_scope(dev);
+	const char *name = acpi_device_name(dev);
+	if (!scope || !name)
+		return;
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(name);
+
+	acpigen_write_name_string("_HID", "NVTN2010");
+	acpigen_write_name_integer("_UID", 0);
+	acpigen_write_name_string("_DDN", dev->chip_ops->name);
+	acpigen_write_STA(acpi_device_status(dev));
+
+	/* Resources */
+	acpigen_write_name("_CRS");
+	acpigen_write_resourcetemplate_header();
+	acpi_device_write_gpio(&config->enable_gpio);
+	acpigen_write_resourcetemplate_footer();
+
+	/* _DSD for devicetree properties */
+	/* This points to the first pin in the first gpio entry in _CRS */
+	path = acpi_device_path(dev);
+	dp = acpi_dp_new_table("_DSD");
+	acpi_dp_add_gpio(dp, "enable-gpios", path, 0, 0,
+			 config->enable_gpio.active_low);
+	acpi_dp_write(dp);
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+
+	printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
+}
+
+static const char *nau8315_acpi_name(const struct device *dev)
+{
+	return "NVTN";
+}
+
+static struct device_operations nau8315_ops = {
+	.read_resources		= noop_read_resources,
+	.set_resources		= noop_set_resources,
+	.acpi_name		= nau8315_acpi_name,
+	.acpi_fill_ssdt		= nau8315_fill_ssdt,
+};
+
+static void nau8315_enable(struct device *dev)
+{
+	dev->ops = &nau8315_ops;
+}
+
+struct chip_operations drivers_generic_nau8315_ops = {
+	CHIP_NAME("Nuvoton NAU8315 Amplifier")
+	.enable_dev = nau8315_enable
+};