2 files changed, 59 insertions, 0 deletions
diff --git a/src/mainboard/google/rex/variants/rex0/Makefile.inc b/src/mainboard/google/rex/variants/rex0/Makefile.inc
index 86a10df2a0..cdbf407ca5 100644
--- a/src/mainboard/google/rex/variants/rex0/Makefile.inc
+++ b/src/mainboard/google/rex/variants/rex0/Makefile.inc
@@ -2,3 +2,4 @@ bootblock-y += gpio.c
 romstage-y += gpio.c
 ramstage-y += gpio.c
 ramstage-y += variant.c
+ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/rex/variants/rex0/fw_config.c b/src/mainboard/google/rex/variants/rex0/fw_config.c
new file mode 100644
index 0000000000..7d7c901270
--- /dev/null
+++ b/src/mainboard/google/rex/variants/rex0/fw_config.c
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+#include <bootstate.h>
+#include <console/console.h>
+#include <fw_config.h>
+#include <gpio.h>
+
+#define GPIO_PADBASED_OVERRIDE(b, a) gpio_padbased_override(b, a, ARRAY_SIZE(a))
+
+static const struct pad_config dmic_disable_pads[] = {
+	PAD_NC(GPP_S02, NONE),
+	PAD_NC(GPP_S03, NONE),
+	PAD_NC(GPP_S06, NONE),
+	PAD_NC(GPP_S07, NONE),
+};
+
+static const struct pad_config sndw_disable_pads[] = {
+	PAD_NC(GPP_S00, NONE),
+	PAD_NC(GPP_S01, NONE),
+	PAD_NC(GPP_S04, NONE),
+	PAD_NC(GPP_S05, NONE),
+};
+
+static const struct pad_config i2s_disable_pads[] = {
+	PAD_NC(GPP_D09, NONE),
+	PAD_NC(GPP_D10, NONE),
+	PAD_NC(GPP_D11, NONE),
+	PAD_NC(GPP_D12, DN_20K),
+	PAD_NC(GPP_D13, NONE),
+	PAD_NC(GPP_D14, NONE),
+	PAD_NC(GPP_D15, NONE),
+	PAD_NC(GPP_D16, NONE),
+	PAD_NC(GPP_D17, NONE),
+};
+
+void fw_config_gpio_padbased_override(struct pad_config *padbased_table)
+{
+	if (!fw_config_is_provisioned()) {
+		GPIO_PADBASED_OVERRIDE(padbased_table, i2s_disable_pads);
+		GPIO_PADBASED_OVERRIDE(padbased_table, dmic_disable_pads);
+		GPIO_PADBASED_OVERRIDE(padbased_table, sndw_disable_pads);
+		return;
+	}
+
+	if (fw_config_probe(FW_CONFIG(AUDIO, AUDIO_UNKNOWN))) {
+		printk(BIOS_INFO, "Configure GPIOs for no audio.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, i2s_disable_pads);
+		GPIO_PADBASED_OVERRIDE(padbased_table, dmic_disable_pads);
+		GPIO_PADBASED_OVERRIDE(padbased_table, sndw_disable_pads);
+	} else if (fw_config_probe(FW_CONFIG(AUDIO, MAX98363_CS42L42_SNDW))) {
+		printk(BIOS_INFO, "Configure GPIOs for SoundWire audio.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, i2s_disable_pads);
+	} else if (fw_config_probe(FW_CONFIG(AUDIO, MAX98360_ALC5682I_I2S))) {
+		printk(BIOS_INFO, "Configure GPIOs for I2S audio.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, sndw_disable_pads);
+	}
+}