mb/google/reef: 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: Id3ab412183e5c5d534b2e1dea3222c729c25118b
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71151
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/reef/romstage.c

@@ -3,11 +3,18 @@
 #include <baseboard/variants.h>
 #include <soc/meminit.h>
 #include <soc/romstage.h>
+#include <variant/gpio.h>
 
 void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
+	const struct pad_config *pads;
+	size_t pads_num;
+
 	meminit_lpddr4_by_sku(&memupd->FspmConfig,
 		variant_lpddr4_config(), variant_memory_sku());
+
+	pads = variant_romstage_gpio_table(&pads_num);
+	gpio_configure_pads(pads, pads_num);
 }
 
 void mainboard_save_dimm_info(void)

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

@@ -392,6 +392,13 @@ variant_sleep_gpio_table(u8 slp_typ, size_t *num)
 	return sleep_gpio_table;
 }
 
+/* Weak implementation of romstage gpio */
+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, GPIO_COMM_NW_NAME),
 	CROS_GPIO_WP_AH(PAD_NW(GPIO_PCH_WP), GPIO_COMM_NW_NAME),

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

@@ -16,6 +16,7 @@ const struct pad_config *variant_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 const struct pad_config *variant_sleep_gpio_table(u8 slp_typ, size_t *num);
 const struct pad_config *variant_sku_gpio_table(size_t *num);
+const struct pad_config *variant_romstage_gpio_table(size_t *num);
 
 /* Baseboard default swizzle. Can be reused if swizzle is same. */
 extern const struct lpddr4_swizzle_cfg baseboard_lpddr4_swizzle;