+++ /dev/null
-obj-$(call lor,$(CONFIG_TPM_TIS),$(CONFIG_TPM_CRB)) += tpm_ppi.o
-common-obj-$(CONFIG_TPM_TIS_ISA) += tpm_tis_isa.o
-common-obj-$(CONFIG_TPM_TIS_SYSBUS) += tpm_tis_sysbus.o
-common-obj-$(CONFIG_TPM_TIS) += tpm_tis_common.o
-common-obj-$(CONFIG_TPM_CRB) += tpm_crb.o
-obj-$(CONFIG_TPM_SPAPR) += tpm_spapr.o
--- /dev/null
+softmmu_ss.add(when: 'CONFIG_TPM_TIS', if_true: files('tpm_tis_common.c'))
+softmmu_ss.add(when: 'CONFIG_TPM_TIS_ISA', if_true: files('tpm_tis_isa.c'))
+softmmu_ss.add(when: 'CONFIG_TPM_TIS_SYSBUS', if_true: files('tpm_tis_sysbus.c'))
+softmmu_ss.add(when: 'CONFIG_TPM_CRB', if_true: files('tpm_crb.c'))
+
+specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TPM_TIS'], if_true: files('tpm_ppi.c'))
+specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TPM_CRB'], if_true: files('tpm_ppi.c'))
+specific_ss.add(when: 'CONFIG_TPM_SPAPR', if_true: files('tpm_spapr.c'))