Merge pull request #3 from marshallward/pass_through_doc

MOM_domain_infra: Document FMS passthroughs

src/framework/MOM_domain_infra.F90

@@ -7,11 +7,11 @@ module MOM_domain_infra
 use MOM_cpu_clock,   only : cpu_clock_begin, cpu_clock_end
 use MOM_error_infra, only : MOM_error=>MOM_err, NOTE, WARNING, FATAL
 
-use mpp_domains_mod, only : domain2D, domain1D, group_pass_type => mpp_group_update_type
+use mpp_domains_mod, only : domain2D, domain1D
 use mpp_domains_mod, only : mpp_define_io_domain, mpp_define_domains, mpp_deallocate_domain
 use mpp_domains_mod, only : mpp_get_domain_components, mpp_get_domain_extents
 use mpp_domains_mod, only : mpp_get_compute_domain, mpp_get_data_domain, mpp_get_global_domain
-use mpp_domains_mod, only : mpp_get_boundary, mpp_update_domains, global_field_sum => mpp_global_sum
+use mpp_domains_mod, only : mpp_get_boundary, mpp_update_domains
 use mpp_domains_mod, only : mpp_start_update_domains, mpp_complete_update_domains
 use mpp_domains_mod, only : mpp_create_group_update, mpp_do_group_update
 use mpp_domains_mod, only : mpp_reset_group_update_field, mpp_group_update_initialized
@@ -26,6 +26,12 @@ module MOM_domain_infra
 use fms_io_mod,      only : file_exist, parse_mask_table
 use fms_affinity_mod, only : fms_affinity_init, fms_affinity_set, fms_affinity_get
 
+! This subroutine is not in MOM6/src but may be required by legacy drivers
+use mpp_domains_mod, only : global_field_sum => mpp_global_sum
+
+! The `group_pass_type` fields are never accessed, so we keep it as an FMS type
+use mpp_domains_mod, only : group_pass_type => mpp_group_update_type
+
 implicit none ; private
 
 ! These types are inherited from mpp, but are treated as opaque here.