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/drivers/intel/mipi_camera/camera.c b/src/drivers/intel/mipi_camera/camera.c
index 77c86ea..4044a26 100644
--- a/src/drivers/intel/mipi_camera/camera.c
+++ b/src/drivers/intel/mipi_camera/camera.c
@@ -199,7 +199,7 @@
 static uint32_t address_for_dev_type(const struct device *dev, uint8_t dev_type)
 {
 	struct drivers_intel_mipi_camera_config *config = dev->chip_info;
-	uint16_t i2c_bus = dev->bus ? dev->bus->secondary : 0xFFFF;
+	uint16_t i2c_bus = dev->upstream ? dev->upstream->secondary : 0xFFFF;
 	uint16_t i2c_addr;
 
 	switch (dev_type) {
@@ -416,7 +416,7 @@
 				.type = DEVICE_PATH_I2C,
 				.i2c.device = config->vcm_address,
 			};
-			struct device *vcm_dev = find_dev_path(dev->bus, &path);
+			struct device *vcm_dev = find_dev_path(dev->upstream, &path);
 			struct drivers_intel_mipi_camera_config *vcm_config;
 			vcm_config = vcm_dev ? vcm_dev->chip_info : NULL;
 
@@ -927,7 +927,7 @@
 	const struct device *pdev;
 
 	if (config->has_power_resource) {
-		pdev = dev->bus->dev;
+		pdev = dev->upstream->dev;
 		if (!pdev || !pdev->enabled)
 			return;
 
@@ -951,7 +951,7 @@
 		write_i2c_camera_device(dev, scope);
 		break;
 	case DEVICE_PATH_GENERIC:
-		pdev = dev->bus->dev;
+		pdev = dev->upstream->dev;
 		scope = acpi_device_scope(pdev);
 		if (!scope)
 			return;