--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -40,7 +40,7 @@ static irq_hw_number_t platform_msi_calc
 {
 	u32 devid = desc->dev->msi.data->platform_data->devid;
 
-	return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
+	return (devid << (32 - DEV_ID_SHIFT)) | desc->msi_index;
 }
 
 static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
@@ -112,8 +112,8 @@ static void platform_msi_free_descs(stru
 	struct msi_desc *desc, *tmp;
 
 	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
-		if (desc->platform.msi_index >= base &&
-		    desc->platform.msi_index < (base + nvec)) {
+		if (desc->msi_index >= base &&
+		    desc->msi_index < (base + nvec)) {
 			list_del(&desc->list);
 			free_msi_entry(desc);
 		}
@@ -129,7 +129,7 @@ static int platform_msi_alloc_descs_with
 	if (!list_empty(dev_to_msi_list(dev))) {
 		desc = list_last_entry(dev_to_msi_list(dev),
 				       struct msi_desc, list);
-		base = desc->platform.msi_index + 1;
+		base = desc->msi_index + 1;
 	}
 
 	for (i = 0; i < nvec; i++) {
@@ -137,7 +137,7 @@ static int platform_msi_alloc_descs_with
 		if (!desc)
 			break;
 
-		desc->platform.msi_index = base + i;
+		desc->msi_index = base + i;
 		desc->irq = virq ? virq + i : 0;
 
 		list_add_tail(&desc->list, dev_to_msi_list(dev));
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -666,7 +666,7 @@ static void hidma_write_msi_msg(struct m
 	struct device *dev = msi_desc_to_dev(desc);
 	struct hidma_dev *dmadev = dev_get_drvdata(dev);
 
-	if (!desc->platform.msi_index) {
+	if (!desc->msi_index) {
 		writel(msg->address_lo, dmadev->dev_evca + 0x118);
 		writel(msg->address_hi, dmadev->dev_evca + 0x11C);
 		writel(msg->data, dmadev->dev_evca + 0x120);
@@ -702,7 +702,7 @@ static int hidma_request_msi(struct hidm
 		return rc;
 
 	for_each_msi_entry(desc, &pdev->dev) {
-		if (!desc->platform.msi_index)
+		if (!desc->msi_index)
 			dmadev->msi_virqbase = desc->irq;
 
 		rc = devm_request_irq(&pdev->dev, desc->irq,
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3142,7 +3142,7 @@ static void arm_smmu_write_msi_msg(struc
 	phys_addr_t doorbell;
 	struct device *dev = msi_desc_to_dev(desc);
 	struct arm_smmu_device *smmu = dev_get_drvdata(dev);
-	phys_addr_t *cfg = arm_smmu_msi_cfg[desc->platform.msi_index];
+	phys_addr_t *cfg = arm_smmu_msi_cfg[desc->msi_index];
 
 	doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo;
 	doorbell &= MSI_CFG0_ADDR_MASK;
@@ -3183,7 +3183,7 @@ static void arm_smmu_setup_msis(struct a
 	}
 
 	for_each_msi_entry(desc, dev) {
-		switch (desc->platform.msi_index) {
+		switch (desc->msi_index) {
 		case EVTQ_MSI_INDEX:
 			smmu->evtq.q.irq = desc->irq;
 			break;
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -1484,7 +1484,7 @@ static void flexrm_mbox_msi_write(struct
 {
 	struct device *dev = msi_desc_to_dev(desc);
 	struct flexrm_mbox *mbox = dev_get_drvdata(dev);
-	struct flexrm_ring *ring = &mbox->rings[desc->platform.msi_index];
+	struct flexrm_ring *ring = &mbox->rings[desc->msi_index];
 
 	/* Configure per-Ring MSI registers */
 	writel_relaxed(msg->address_lo, ring->regs + RING_MSI_ADDR_LS);
@@ -1609,7 +1609,7 @@ static int flexrm_mbox_probe(struct plat
 
 	/* Save alloced IRQ numbers for each ring */
 	for_each_msi_entry(desc, dev) {
-		ring = &mbox->rings[desc->platform.msi_index];
+		ring = &mbox->rings[desc->msi_index];
 		ring->irq = desc->irq;
 	}
 
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -107,14 +107,6 @@ struct pci_msi_desc {
 };
 
 /**
- * platform_msi_desc - Platform device specific msi descriptor data
- * @msi_index:		The index of the MSI descriptor for multi MSI
- */
-struct platform_msi_desc {
-	u16				msi_index;
-};
-
-/**
  * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
  * @msi_index:		The index of the MSI descriptor
  */
@@ -145,7 +137,6 @@ struct ti_sci_inta_msi_desc {
  *
  * @msi_index:	Index of the msi descriptor
  * @pci:	[PCI]	    PCI speficic msi descriptor data
- * @platform:	[platform]  Platform device specific msi descriptor data
  * @fsl_mc:	[fsl-mc]    FSL MC device specific msi descriptor data
  * @inta:	[INTA]	    TISCI based INTA specific msi descriptor data
  */
@@ -167,7 +158,6 @@ struct msi_desc {
 	u16				msi_index;
 	union {
 		struct pci_msi_desc		pci;
-		struct platform_msi_desc	platform;
 		struct fsl_mc_msi_desc		fsl_mc;
 		struct ti_sci_inta_msi_desc	inta;
 	};
