device/device.h: Rename busses for clarity

This renames bus to upstream and link_list to downstream.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I80a81b6b8606e450ff180add9439481ec28c2420
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78330
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/northbridge/amd/pi/00730F01/northbridge.c b/src/northbridge/amd/pi/00730F01/northbridge.c
index 7e9cfd8..b318be0 100644
--- a/src/northbridge/amd/pi/00730F01/northbridge.c
+++ b/src/northbridge/amd/pi/00730F01/northbridge.c
@@ -186,7 +186,7 @@
 		ivrs_ivhd_generic_t *ivhd_entry = (ivrs_ivhd_generic_t *)*current;
 
 		ivhd_entry->type = type;
-		ivhd_entry->dev_id = dev->path.pci.devfn | (dev->bus->secondary << 8);
+		ivhd_entry->dev_id = dev->path.pci.devfn | (dev->upstream->secondary << 8);
 		ivhd_entry->dte_setting = data;
 		*current += sizeof(ivrs_ivhd_generic_t);
 	} else if (type == IVHD_DEV_8_BYTE_ALIAS_SELECT) {
@@ -195,12 +195,12 @@
 		ivrs_ivhd_alias_t *ivhd_entry = (ivrs_ivhd_alias_t *)*current;
 
 		ivhd_entry->type = type;
-		ivhd_entry->dev_id = dev->path.pci.devfn | (dev->bus->secondary << 8);
+		ivhd_entry->dev_id = dev->path.pci.devfn | (dev->upstream->secondary << 8);
 		ivhd_entry->dte_setting = data;
 		ivhd_entry->reserved1 = 0;
 		ivhd_entry->reserved2 = 0;
 		ivhd_entry->source_dev_id = parent->path.pci.devfn |
-					    (parent->bus->secondary << 8);
+					    (parent->upstream->secondary << 8);
 		*current += sizeof(ivrs_ivhd_alias_t);
 	}
 
@@ -243,7 +243,7 @@
 
 	if (dev->path.type == DEVICE_PATH_PCI) {
 
-		if ((dev->bus->secondary == 0x0) &&
+		if ((dev->upstream->secondary == 0x0) &&
 		    (dev->path.pci.devfn == 0x0))
 			*root_level = depth;
 
@@ -253,8 +253,8 @@
 		}
 	}
 
-	if (dev->link_list) {
-		for (sibling = dev->link_list->children; sibling; sibling = sibling->sibling)
+	if (dev->downstream) {
+		for (sibling = dev->downstream->children; sibling; sibling = sibling->sibling)
 			add_ivhd_device_entries(dev, sibling, depth + 1, depth, root_level,
 						current, ivhd_length);
 	}
@@ -290,12 +290,12 @@
 	ivhd_11->flags = ivrs_agesa->ivhd.flags & 0x3f;
 	ivhd_11->length = sizeof(struct acpi_ivrs_ivhd_11);
 	/* BDF <bus>:00.2 */
-	ivhd_11->device_id = 0x02 | (nb_dev->bus->secondary << 8);
+	ivhd_11->device_id = 0x02 | (nb_dev->upstream->secondary << 8);
 	/* PCI Capability block 0x40 (type 0xf, "Secure device") */
 	ivhd_11->capability_offset = 0x40;
 	ivhd_11->iommu_base_low = ivrs_agesa->ivhd.iommu_base_low;
 	ivhd_11->iommu_base_high = ivrs_agesa->ivhd.iommu_base_high;
-	ivhd_11->pci_segment_group = nb_dev->bus->segment_group;
+	ivhd_11->pci_segment_group = nb_dev->upstream->segment_group;
 	ivhd_11->iommu_info = ivrs_agesa->ivhd.iommu_info;
 	ivhd_11->iommu_attributes.perf_counters =
 		(IOMMU_MMIO32(ivhd_11->iommu_base_low + 0x4000) >> 7) & 0xf;
@@ -358,12 +358,12 @@
 		ivrs->ivhd.flags = ivrs_agesa->ivhd.flags;
 		ivrs->ivhd.length = sizeof(struct acpi_ivrs_ivhd);
 		/* BDF <bus>:00.2 */
-		ivrs->ivhd.device_id = 0x02 | (nb_dev->bus->secondary << 8);
+		ivrs->ivhd.device_id = 0x02 | (nb_dev->upstream->secondary << 8);
 		/* PCI Capability block 0x40 (type 0xf, "Secure device") */
 		ivrs->ivhd.capability_offset = 0x40;
 		ivrs->ivhd.iommu_base_low = ivrs_agesa->ivhd.iommu_base_low;
 		ivrs->ivhd.iommu_base_high = ivrs_agesa->ivhd.iommu_base_high;
-		ivrs->ivhd.pci_segment_group = nb_dev->bus->segment_group;
+		ivrs->ivhd.pci_segment_group = nb_dev->upstream->segment_group;
 		ivrs->ivhd.iommu_info = ivrs_agesa->ivhd.iommu_info;
 		ivrs->ivhd.iommu_feature_info = ivrs_agesa->ivhd.iommu_feature_info;
 		/* Enable EFR if supported */
diff --git a/src/northbridge/intel/e7505/northbridge.c b/src/northbridge/intel/e7505/northbridge.c
index fa29ef5..23d60dc 100644
--- a/src/northbridge/intel/e7505/northbridge.c
+++ b/src/northbridge/intel/e7505/northbridge.c
@@ -52,7 +52,7 @@
 
 static void mch_domain_set_resources(struct device *dev)
 {
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 struct device_operations e7505_pci_domain_ops = {
diff --git a/src/northbridge/intel/gm45/northbridge.c b/src/northbridge/intel/gm45/northbridge.c
index 50d0d89..dc18791 100644
--- a/src/northbridge/intel/gm45/northbridge.c
+++ b/src/northbridge/intel/gm45/northbridge.c
@@ -122,7 +122,7 @@
 			report_resource_stored(dev, resource, "");
 	}
 
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 static void mch_domain_init(struct device *dev)
diff --git a/src/northbridge/intel/haswell/pcie.c b/src/northbridge/intel/haswell/pcie.c
index 7fe57e9..4eeaa3f 100644
--- a/src/northbridge/intel/haswell/pcie.c
+++ b/src/northbridge/intel/haswell/pcie.c
@@ -20,8 +20,8 @@
 	if (dev->path.type != DEVICE_PATH_PCI)
 		return NULL;
 
-	assert(dev->bus);
-	if (dev->bus->secondary == 0)
+	assert(dev->upstream);
+	if (dev->upstream->secondary == 0)
 		switch (dev->path.pci.devfn) {
 		case PCI_DEVFN(1, 0):
 			return "PEGP";
@@ -31,12 +31,12 @@
 			return "PEG2";
 		};
 
-	struct device *const port = dev->bus->dev;
+	struct device *const port = dev->upstream->dev;
 	assert(port);
-	assert(port->bus);
+	assert(port->upstream);
 
 	if (dev->path.pci.devfn == PCI_DEVFN(0, 0) &&
-	    port->bus->secondary == 0 &&
+	    port->upstream->secondary == 0 &&
 	    (port->path.pci.devfn == PCI_DEVFN(1, 0) ||
 	    port->path.pci.devfn == PCI_DEVFN(1, 1) ||
 	    port->path.pci.devfn == PCI_DEVFN(1, 2)))
diff --git a/src/northbridge/intel/i440bx/northbridge.c b/src/northbridge/intel/i440bx/northbridge.c
index d588197..0a72cb7 100644
--- a/src/northbridge/intel/i440bx/northbridge.c
+++ b/src/northbridge/intel/i440bx/northbridge.c
@@ -34,8 +34,8 @@
 
 	pci_domain_read_resources(dev);
 
-	pci_tolm = find_pci_tolm(dev->link_list);
-	mc_dev = dev->link_list->children;
+	pci_tolm = find_pci_tolm(dev->downstream);
+	mc_dev = dev->downstream->children;
 	if (mc_dev) {
 		unsigned long tomk, tolmk;
 		int idx;
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index 34ebcb2..79e9ee5 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -26,7 +26,7 @@
 	/* Can we find out how much memory we can use at most
 	 * this way?
 	 */
-	pci_tolm = find_pci_tolm(dev->link_list);
+	pci_tolm = find_pci_tolm(dev->downstream);
 	printk(BIOS_DEBUG, "pci_tolm: 0x%x\n", pci_tolm);
 
 	tolud = pci_read_config8(d0f0, TOLUD) << 24;
@@ -65,7 +65,7 @@
 	for (res = dev->resource_list; res; res = res->next)
 		report_resource_stored(dev, res, "");
 
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 static const char *northbridge_acpi_name(const struct device *dev)
diff --git a/src/northbridge/intel/pineview/northbridge.c b/src/northbridge/intel/pineview/northbridge.c
index d7a6c84..c24493a 100644
--- a/src/northbridge/intel/pineview/northbridge.c
+++ b/src/northbridge/intel/pineview/northbridge.c
@@ -108,7 +108,7 @@
 	for (res = dev->resource_list; res; res = res->next)
 		report_resource_stored(dev, res, "");
 
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 static void mch_domain_init(struct device *dev)
diff --git a/src/northbridge/intel/sandybridge/pcie.c b/src/northbridge/intel/sandybridge/pcie.c
index 96fb12f..244b0f5 100644
--- a/src/northbridge/intel/sandybridge/pcie.c
+++ b/src/northbridge/intel/sandybridge/pcie.c
@@ -13,8 +13,8 @@
 	if (dev->path.type != DEVICE_PATH_PCI)
 		return NULL;
 
-	assert(dev->bus);
-	if (dev->bus->secondary == 0)
+	assert(dev->upstream);
+	if (dev->upstream->secondary == 0)
 		switch (dev->path.pci.devfn) {
 		case PCI_DEVFN(1, 0):
 			return "PEGP";
@@ -26,12 +26,12 @@
 			return "PEG6";
 		};
 
-	struct device *const port = dev->bus->dev;
+	struct device *const port = dev->upstream->dev;
 	assert(port);
-	assert(port->bus);
+	assert(port->upstream);
 
 	if (dev->path.pci.devfn == PCI_DEVFN(0, 0) &&
-	    port->bus->secondary == 0 &&
+	    port->upstream->secondary == 0 &&
 	    (port->path.pci.devfn == PCI_DEVFN(1, 0) ||
 	     port->path.pci.devfn == PCI_DEVFN(1, 1) ||
 	     port->path.pci.devfn == PCI_DEVFN(1, 2) ||
diff --git a/src/northbridge/intel/x4x/northbridge.c b/src/northbridge/intel/x4x/northbridge.c
index b037cf8..4987cae 100644
--- a/src/northbridge/intel/x4x/northbridge.c
+++ b/src/northbridge/intel/x4x/northbridge.c
@@ -72,7 +72,7 @@
 	for (res = dev->resource_list; res; res = res->next)
 		report_resource_stored(dev, res, "");
 
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 static void mch_domain_init(struct device *dev)