mb/google/dedede: Add method to set GPIOs in romstage

Add method variant_romstage_gpio_table() with empty weak implementation
to allow variants to override as needed for touchscreen power
sequencing (to be implemented in a subsequent commit). Call method
in romstage to program any GPIOs the variant may need to set.

TEST=tested with rest of patch train

Change-Id: Ic216827a4b53d1d35913efca63a43d4672791c54
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71186
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

src/mainboard/google/dedede/romstage.c

@@ -10,6 +10,8 @@
 
 void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
+	const struct pad_config *pads;
+	size_t pads_num;
 	const struct mb_cfg *board_cfg = variant_memcfg_config();
 	const struct spd_info spd_info = {
 		.read_type = READ_SPD_CBFS,
@@ -18,4 +20,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	bool half_populated = variant_mem_is_half_populated();
 
 	memcfg_init(&memupd->FspmConfig, board_cfg, &spd_info, half_populated);
+
+	pads = variant_romstage_gpio_table(&pads_num);
+	gpio_configure_pads(pads, pads_num);
 }

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

@@ -1,5 +1,6 @@
 bootblock-y += gpio.c
 
+romstage-y += gpio.c
 romstage-y += memory.c
 
 ramstage-y += gpio.c

src/mainboard/google/dedede/variants/baseboard/gpio.c

@@ -469,6 +469,12 @@ const struct pad_config *__weak variant_sleep_gpio_table(size_t *num)
 	return sleep_gpio_table;
 }
 
+const struct pad_config *__weak variant_romstage_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}
+
 static const struct cros_gpio cros_gpios[] = {
 	CROS_GPIO_REC_AL(CROS_GPIO_VIRTUAL, CROS_GPIO_COMM0_NAME),
 	CROS_GPIO_WP_AH(GPIO_PCH_WP, CROS_GPIO_COMM0_NAME),

src/mainboard/google/dedede/variants/baseboard/include/baseboard/variants.h

@@ -14,6 +14,7 @@ const struct pad_config *baseboard_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 const struct pad_config *variant_sleep_gpio_table(size_t *num);
 const struct pad_config *variant_override_gpio_table(size_t *num);
+const struct pad_config *variant_romstage_gpio_table(size_t *num);
 
 enum s0ix_entry {
 	S0IX_EXIT,