mb/google/zork: Switch to using newly added i2s_machine_dev driver

This change switches zork devices to use the newly added
i2s_machine_dev driver in devicetree rather than passing
dmic_select_gpio in SoC config.

BUG=b:157708581

Change-Id: I76c633694cbfb454c081ab2a4af4765bfbbae16b
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 35 insertions, 6 deletions

diff --git a/src/mainboard/google/zork/variants/baseboard/ramstage_common.c b/src/mainboard/google/zork/variants/baseboard/ramstage_common.c
index f7f11b88ea..511d60d0b8 100644
--- a/src/mainboard/google/zork/variants/baseboard/ramstage_common.c
+++ b/src/mainboard/google/zork/variants/baseboard/ramstage_common.c
@@ -2,19 +2,48 @@
 
 #include <acpi/acpi_device.h>
 #include <baseboard/variants.h>
+#include <drivers/amd/i2s_machine_dev/chip.h>
 #include <ec/google/chromeec/ec.h>
 #include <soc/gpio.h>
+#include <soc/pci_devs.h>
+
+extern struct chip_operations drivers_amd_i2s_machine_dev_ops;
 
 void variant_audio_update(void)
 {
-	struct soc_amd_picasso_config *cfg = config_of_soc();
-	struct acpi_gpio *gpio = &cfg->dmic_select_gpio;
+	const struct device *gpp_a_dev;
+	const struct device *acp_dev;
+	struct device *machine_dev = NULL;
 
 	if (variant_uses_v3_schematics())
 		return;
 
-	if (CONFIG(BOARD_GOOGLE_BASEBOARD_TREMBYLE))
-		gpio->pins[0] = GPIO_13;
-	else
-		gpio->pins[0] = GPIO_6;
+	gpp_a_dev = pcidev_path_on_root(PCIE_GPP_A_DEVFN);
+	if (gpp_a_dev == NULL)
+		return;
+
+	acp_dev = pcidev_path_behind(gpp_a_dev->link_list, AUDIO_DEVFN);
+	if (acp_dev == NULL)
+		return;
+
+	while ((machine_dev = dev_bus_each_child(acp_dev->link_list, machine_dev)) != NULL) {
+		struct drivers_amd_i2s_machine_dev_config *cfg;
+		struct acpi_gpio *gpio;
+
+		if (machine_dev->chip_info == NULL)
+			continue;
+
+		if (machine_dev->chip_ops != &drivers_amd_i2s_machine_dev_ops)
+			continue;
+
+		cfg = machine_dev->chip_info;
+		gpio = &cfg->dmic_select_gpio;
+
+		if (CONFIG(BOARD_GOOGLE_BASEBOARD_TREMBYLE))
+			gpio->pins[0] = GPIO_13;
+		else
+			gpio->pins[0] = GPIO_6;
+
+		break;
+	}
 }