device: Add a helper function to add a downstream bus

Adding downstream busses at runtime is a common pattern so add a helper
function.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: Ic898189b92997b93304fcbf47c73e2bb5ec09023
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80210
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 1 insertions, 6 deletions

diff --git a/src/soc/intel/xeon_sp/spr/ioat.c b/src/soc/intel/xeon_sp/spr/ioat.c
index 02f35cfe77..60936a8a42 100644
--- a/src/soc/intel/xeon_sp/spr/ioat.c
+++ b/src/soc/intel/xeon_sp/spr/ioat.c
@@ -45,12 +45,7 @@ static void create_ioat_domain(const union xeon_domain_path dp, struct bus *cons
 
 	domain->ops = &ioat_domain_ops;
 
-	domain->link_list = calloc(1, sizeof(struct bus));
-	if (!domain->link_list)
-		die("%s: out of memory.\n", __func__);
-
-	struct bus *const bus = domain->link_list;
-	bus->dev = domain;
+	struct bus *const bus = alloc_bus(domain);
 	bus->secondary = bus_base;
 	bus->subordinate = bus->secondary;
 	bus->max_subordinate = bus_limit;