src/mainboard/google/skyrim/variants/baseboard/Makefile.inc

bootblock-y += gpio.c

romstage-y += gpio.c
romstage-y += tpm_tis.c

ramstage-y += gpio.c
ramstage-y += tpm_tis.c

verstage-y += tpm_tis.c
verstage-$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK) += gpio.c

smm-y += gpio.c