mb/google/volteer/var/delbin: Add fw_config probe for ALC5682-VD & VS

ALC5682-VD/ALC5682I-VS load different kernel driver by different hid
name. Update hid name depending on the AUDIO_CODEC_SOURCE field of
fw_config. Define FW_CONFIG bits 41 - 43 (SSFC bits 9 - 11)
for codec selection.

ALC5682-VD: _HID = "10EC5682"
ALC5682I-VS: _HID = "RTL5682"

BUG=b:204523176
BRANCH=volteer
TEST=ALC5682-VD/ALC5682I-VS audio codec can work

Signed-off-by: FrankChu <frank_chu@pegatron.corp-partner.google.com>
Change-Id: Ieef638f78edd3428e572a76f06fb9c8757278971
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59557
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

src/mainboard/google/volteer/Kconfig

@@ -18,6 +18,7 @@ config BOARD_GOOGLE_BASEBOARD_VOLTEER
 	select DRIVERS_USB_ACPI
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_BOARDID
+	select EC_GOOGLE_CHROMEEC_INCLUDE_SSFC_IN_FW_CONFIG
 	select EC_GOOGLE_CHROMEEC_LPC
 	select EC_GOOGLE_CHROMEEC_SKUID
 	select FW_CONFIG

src/mainboard/google/volteer/variants/delbin/Makefile.inc

@@ -5,3 +5,5 @@ romstage-y += memory.c
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+
+ramstage-y += variant.c

src/mainboard/google/volteer/variants/delbin/overridetree.cb

@@ -1,3 +1,10 @@
+fw_config
+	field AUDIO_CODEC_SOURCE 41 43
+		option AUDIO_CODEC_UNPROVISIONED 0
+		option AUDIO_CODEC_ALC5682 1
+		option AUDIO_CODEC_ALC5682I_VS 2
+	end
+end
 chip soc/intel/tigerlake
 	register "DdiPort1Hpd" = "0"
 	register "DdiPort2Hpd" = "0"
@@ -129,7 +136,7 @@ chip soc/intel/tigerlake
 		end # DPTF				0x9A03
 		device ref i2c0 on
 			chip drivers/i2c/generic
-				register "hid" = ""10EC5682""
+				# register "hid" is set in variant.c because of FW_CONFIG
 				register "name" = ""RT58""
 				register "desc" = ""Headset Codec""
 				register "irq_gpio" = "ACPI_GPIO_IRQ_EDGE_BOTH(GPP_F8)"

src/mainboard/google/volteer/variants/delbin/variant.c

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <fw_config.h>
+#include <drivers/i2c/generic/chip.h>
+#include <soc/pci_devs.h>
+
+extern struct chip_operations drivers_i2c_generic_ops;
+static void audio_codec_update(void)
+{
+	const struct device_path codec_path[] = {
+		{.type = DEVICE_PATH_PCI, .pci.devfn = PCH_DEVFN_I2C0},
+		{.type = DEVICE_PATH_I2C, .i2c.device = 0x1a}
+	};
+	const struct device *codec =
+		find_dev_nested_path(pci_root_bus(), codec_path,
+				ARRAY_SIZE(codec_path));
+	struct drivers_i2c_generic_config *config;
+
+	if (!codec || (codec->chip_ops != &drivers_i2c_generic_ops) ||
+			!codec->chip_info)
+		return;
+	config = codec->chip_info;
+
+	if (fw_config_probe(FW_CONFIG(AUDIO_CODEC_SOURCE, AUDIO_CODEC_ALC5682)))
+		config->hid = "10EC5682";
+	else if (fw_config_probe(FW_CONFIG(AUDIO_CODEC_SOURCE,
+					AUDIO_CODEC_ALC5682I_VS)))
+		config->hid = "RTL5682";
+}
+void variant_devtree_update(void)
+{
+	audio_codec_update();
+}