drivers/adau7002: Add driver for handling ADAU7002

The ADAU7002 is a family of Stereo PDM-to-I2S/TDM conversion ICs from
Analog Devices.  On some boards they are a used to convert a PDM audio
data stream from a DMIC to an I2S signal.

Add a driver for populating ACPI table entries for this part.

BUG=b:72121803
TEST=With grunt audio kernel patches, "aplay -l" shows playback devices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: acpd7219m98357 [acpd7219m98357], device 0: Playback da7219-hifi-0 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 card 0: acpd7219m98357 [acpd7219m98357], device 2: HiFi Playback HiFi-2 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0

Change-Id: I2b64c8e1cbc0a68984482a7d496f8c4498cb6cbe
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/23659
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: Martin Roth <martinroth@google.com>

src/drivers/generic/adau7002/Kconfig

@@ -0,0 +1,2 @@
+config DRIVERS_GENERIC_ADAU7002
+	bool

src/drivers/generic/adau7002/Makefile.inc

@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_GENERIC_ADAU7002) += adau7002.c

src/drivers/generic/adau7002/adau7002.c

@@ -0,0 +1,74 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/acpi_device.h>
+#include <arch/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <stdint.h>
+#include <string.h>
+#include "chip.h"
+
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+
+#define ADAU7002_ACPI_NAME	"ADAU"
+#define ADAU7002_ACPI_HID	"ADAU7002"
+
+static void adau7002_fill_ssdt(struct device *dev)
+{
+	if (!dev->enabled)
+		return;
+
+	/* Device */
+	acpigen_write_scope(acpi_device_scope(dev));
+	acpigen_write_device(acpi_device_name(dev));
+	acpigen_write_name_string("_HID", ADAU7002_ACPI_HID);
+	acpigen_write_name_integer("_UID", 0);
+	acpigen_write_name_string("_DDN", dev->chip_ops->name);
+	acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+
+	printk(BIOS_INFO, "%s: %s\n", acpi_device_path(dev),
+	       dev->chip_ops->name);
+}
+
+static const char *adau7002_acpi_name(const struct device *dev)
+{
+	return ADAU7002_ACPI_NAME;
+}
+#endif
+
+static struct device_operations adau7002_ops = {
+	.read_resources			= DEVICE_NOOP,
+	.set_resources			= DEVICE_NOOP,
+	.enable_resources		= DEVICE_NOOP,
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+	.acpi_name			= &adau7002_acpi_name,
+	.acpi_fill_ssdt_generator	= &adau7002_fill_ssdt,
+#endif
+};
+
+static void adau7002_enable(struct device *dev)
+{
+	dev->ops = &adau7002_ops;
+}
+
+struct chip_operations drivers_generic_adau7002_ops = {
+	CHIP_NAME("Analog Digital DMIC")
+	.enable_dev = &adau7002_enable
+};

src/drivers/generic/adau7002/chip.h

@@ -0,0 +1,4 @@
+#include <arch/acpi_device.h>
+
+struct drivers_generic_adau7002_config {
+};