diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index 6b660d014eea..cc31ed191943 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -563,6 +563,8 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
 		return ret;
 	}
 
+	mhi_misc_init_mmio(mhi_cntrl);
+
 	return 0;
 }
 
@@ -707,6 +709,9 @@ static int parse_ev_cfg(struct mhi_controller *mhi_cntrl,
 		case MHI_ER_CTRL:
 			mhi_event->process_event = mhi_process_ctrl_ev_ring;
 			break;
+		case MHI_ER_BW_SCALE:
+			mhi_event->process_event = mhi_process_misc_bw_ev_ring;
+			break;
 		default:
 			dev_err(dev, "Event Ring type not supported\n");
 			goto error_ev_cfg;
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index e251cb6e9407..cf4029053378 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.
  *
  */
 #ifndef _MHI_H_
@@ -104,10 +104,12 @@ struct image_info {
  * struct mhi_link_info - BW requirement
  * target_link_speed - Link speed as defined by TLS bits in LinkControl reg
  * target_link_width - Link width as defined by NLW bits in LinkStatus reg
+ * sequence_num - used by device to track bw requests sent to host
  */
 struct mhi_link_info {
 	unsigned int target_link_speed;
 	unsigned int target_link_width;
+	int sequence_num;
 };
 
 /**
@@ -185,10 +187,12 @@ enum mhi_ch_ee_mask {
  * enum mhi_er_data_type - Event ring data types
  * @MHI_ER_DATA: Only client data over this ring
  * @MHI_ER_CTRL: MHI control data and client data
+ * @MHI_ER_BW_SCALE: MHI controller bandwidth scale functionality
  */
 enum mhi_er_data_type {
 	MHI_ER_DATA,
 	MHI_ER_CTRL,
+	MHI_ER_BW_SCALE,
 };
 
 /**