mg/google/zork: Add functionality to set GPIOs in romstage

Add (empty) baseboard GPIO tables, getter functions, and call to
gpio_configure_pads() in romstage, in preparation for adding
touchscreen GPIO configuration/power sequencing.

Change-Id: If0f626dbc7e601c2f49759e49a0baf027bf25f96
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69482
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/mainboard/google/zork/romstage.c

@@ -2,6 +2,7 @@
 
 #include <baseboard/variants.h>
 #include <soc/fsp.h>
+#include <soc/platform_descriptors.h>
 
 void __weak variant_updm_update(FSP_M_CONFIG *mcfg) {}
 
@@ -9,3 +10,12 @@ void mainboard_updm_update(FSP_M_CONFIG *mcfg)
 {
 	variant_updm_update(mcfg);
 }
+
+void mb_pre_fspm(void)
+{
+	const struct soc_amd_gpio *gpios;
+	size_t num_gpios;
+
+	gpios = baseboard_romstage_gpio_table(&num_gpios);
+	gpio_configure_pads(gpios, num_gpios);
+}

src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c

@@ -353,3 +353,11 @@ const struct soc_amd_gpio *variant_early_gpio_table(size_t *size)
 	*size = ARRAY_SIZE(early_gpio_table);
 	return early_gpio_table;
 }
+
+static const struct soc_amd_gpio romstage_gpio_table[] = {};
+
+const struct soc_amd_gpio *baseboard_romstage_gpio_table(size_t *size)
+{
+	*size = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}

src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c

@@ -402,3 +402,11 @@ const struct soc_amd_gpio *variant_early_gpio_table(size_t *size)
 	*size = ARRAY_SIZE(early_gpio_table);
 	return early_gpio_table;
 }
+
+static const struct soc_amd_gpio romstage_gpio_table[] = {};
+
+const struct soc_amd_gpio *baseboard_romstage_gpio_table(size_t *size)
+{
+	*size = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}

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

@@ -23,6 +23,9 @@ const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
 /* This function provides GPIO init in bootblock. */
 const struct soc_amd_gpio *variant_bootblock_gpio_table(size_t *size, int slp_typ);
 
+/* This function provides GPIO settings for romstage. */
+const struct soc_amd_gpio *baseboard_romstage_gpio_table(size_t *size);
+
 /*
  * This function provides GPIO table for the pads that need to be configured when entering
  * sleep.