4 files changed, 58 insertions, 0 deletions
diff --git a/src/mainboard/amd/birman/Makefile.mk b/src/mainboard/amd/birman/Makefile.mk
index 6c417ce54c..2df1f5925e 100644
--- a/src/mainboard/amd/birman/Makefile.mk
+++ b/src/mainboard/amd/birman/Makefile.mk
@@ -9,6 +9,7 @@ romstage-$(CONFIG_BOARD_AMD_BIRMAN_GLINDA) += port_descriptors_glinda.c
 
 ramstage-y += chromeos.c
 ramstage-y += gpio.c
+ramstage-$(CONFIG_BOARD_AMD_BIRMAN_PHOENIX_OPENSIL) += update_devicetree_phoenix_opensil.c
 ramstage-$(CONFIG_BOARD_AMD_BIRMAN_PHOENIX_FSP) += port_descriptors_phoenix.c
 ramstage-$(CONFIG_BOARD_AMD_BIRMAN_GLINDA) += port_descriptors_glinda.c
 
diff --git a/src/mainboard/amd/birman/mainboard.c b/src/mainboard/amd/birman/mainboard.c
index 0deba6710f..f2d3ef9e53 100644
--- a/src/mainboard/amd/birman/mainboard.c
+++ b/src/mainboard/amd/birman/mainboard.c
@@ -6,6 +6,7 @@
 #include <device/device.h>
 #include <types.h>
 #include "gpio.h"
+#include "update_devicetree.h"
 
 /* TODO: Update for birman */
 
@@ -58,6 +59,9 @@ const struct fch_irq_routing *mb_get_fch_irq_mapping(size_t *length)
 static void mainboard_init(void *chip_info)
 {
 	mainboard_program_gpios();
+
+	if (CONFIG(BOARD_AMD_BIRMAN_PHOENIX_OPENSIL))
+		mainboard_update_devicetree_opensil();
 }
 
 struct chip_operations mainboard_ops = {
diff --git a/src/mainboard/amd/birman/update_devicetree.h b/src/mainboard/amd/birman/update_devicetree.h
new file mode 100644
index 0000000000..6f98dbd0ef
--- /dev/null
+++ b/src/mainboard/amd/birman/update_devicetree.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef MAINBOARD_UPDATE_DEVICETREE_H
+#define MAINBOARD_UPDATE_DEVICETREE_H
+
+void mainboard_update_devicetree_opensil(void);
+
+#endif  /* MAINBOARD_UPDATE_DEVICETREE_H */
diff --git a/src/mainboard/amd/birman/update_devicetree_phoenix_opensil.c b/src/mainboard/amd/birman/update_devicetree_phoenix_opensil.c
new file mode 100644
index 0000000000..6e44302ec3
--- /dev/null
+++ b/src/mainboard/amd/birman/update_devicetree_phoenix_opensil.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/device.h>
+#include <soc/soc_util.h>
+#include <vendorcode/amd/opensil/stub/mpio/chip.h>
+#include "update_devicetree.h"
+
+static void mainboard_update_mpio(void)
+{
+	struct device *mxm_bridge = DEV_PTR(gpp_bridge_1_1);
+	struct device *ssd1_bridge = DEV_PTR(gpp_bridge_1_2);
+	struct device *wwan_bridge = DEV_PTR(gpp_bridge_2_2);
+	struct device *wlan_bridge = DEV_PTR(gpp_bridge_2_3);
+	struct vendorcode_amd_opensil_chip_mpio_config *mxm_bridge_cfg = config_of(mxm_bridge);
+	struct vendorcode_amd_opensil_chip_mpio_config *ssd1_bridge_cfg = config_of(ssd1_bridge);
+	struct vendorcode_amd_opensil_chip_mpio_config *wwan_bridge_cfg = config_of(wwan_bridge);
+	struct vendorcode_amd_opensil_chip_mpio_config *wlan_bridge_cfg = config_of(wlan_bridge);
+
+	/* Phoenix 2 has less PCIe lanes than Phoenix */
+	if (get_soc_type() == SOC_PHOENIX2) {
+		mxm_bridge_cfg->end_lane = 3;
+		ssd1_bridge_cfg->end_lane = 9;
+	}
+	if (!CONFIG(ENABLE_EVAL_CARD)) {
+		mxm_bridge->enabled = false;
+	}
+	if (CONFIG(DISABLE_DT_M2)) {
+		ssd1_bridge->enabled = false;
+	}
+	/* When the WLAN card uses 2 lanes, the WWAN card can't be used */
+	if (CONFIG(WLAN01)) {
+		wwan_bridge->enabled = false;
+		wlan_bridge_cfg->end_lane = 14;
+	}
+	/* When the WWAN card uses 2 lanes, the WLAN card can't be used */
+	if (CONFIG(WWAN01)) {
+		wlan_bridge->enabled = false;
+		wwan_bridge_cfg->end_lane = 15;
+	}
+}
+
+void mainboard_update_devicetree_opensil(void)
+{
+	mainboard_update_mpio();
+}