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/soc/intel/common/block/pcie/rtd3/rtd3.c b/src/soc/intel/common/block/pcie/rtd3/rtd3.c
index 39c82b1..3a7c8b4 100644
--- a/src/soc/intel/common/block/pcie/rtd3/rtd3.c
+++ b/src/soc/intel/common/block/pcie/rtd3/rtd3.c
@@ -140,7 +140,7 @@
 			 enum pcie_rp_type rp_type,
 			 const struct device *dev)
 {
-	const struct device *parent = dev->bus->dev;
+	const struct device *parent = dev->upstream->dev;
 
 	acpigen_write_method_serialized("_ON", 0);
 
@@ -224,7 +224,7 @@
 			  const struct device *dev)
 
 {
-	const struct device *parent = dev->bus->dev;
+	const struct device *parent = dev->upstream->dev;
 
 	acpigen_write_method_serialized("_OFF", 0);
 
@@ -385,7 +385,7 @@
 
 	const struct soc_intel_common_block_pcie_rtd3_config *config = config_of(dev);
 	static const char *const power_res_states[] = {"_PR0"};
-	const struct device *parent = dev->bus->dev;
+	const struct device *parent = dev->upstream->dev;
 	const char *scope = acpi_device_path(parent);
 	const struct opregion opregion = OPREGION("PXCS", PCI_CONFIG, 0, 0xff);
 	const struct fieldlist fieldlist[] = {