ACPI/IORT: Enable stall support for platform devices

Copy the "Stall supported" bit, that tells whether a named component
supports stall, into the dma-can-stall device property.

Acked-by: Hanjun Guo <guohanjun@huawei.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20210526161927.24268-3-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>

drivers/acpi/arm64/iort.c

@@ -968,13 +968,15 @@ static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
 static void iort_named_component_init(struct device *dev,
 				      struct acpi_iort_node *node)
 {
-	struct property_entry props[2] = {};
+	struct property_entry props[3] = {};
 	struct acpi_iort_named_component *nc;
 
 	nc = (struct acpi_iort_named_component *)node->node_data;
 	props[0] = PROPERTY_ENTRY_U32("pasid-num-bits",
 				      FIELD_GET(ACPI_IORT_NC_PASID_BITS,
 						nc->node_flags));
+	if (nc->node_flags & ACPI_IORT_NC_STALL_SUPPORTED)
+		props[1] = PROPERTY_ENTRY_BOOL("dma-can-stall");
 
 	if (device_add_properties(dev, props))
 		dev_warn(dev, "Could not add device properties\n");