mb/google/poppy: Add support for variant SKU romstage GPIO configs

Add functionality that allows a variant SKU to have a specific set of
GPIO configs in romstage (modeled after the existing one in
ramstage)


BUG=b:245954151
TEST=builds

Change-Id: I593a23951306908fadc00e6bc8d9d310f09c5e4b
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73211
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Shelley Chen <shchen@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/mainboard/google/poppy/romstage.c

@@ -140,6 +140,8 @@ void mainboard_memory_init_params(FSPM_UPD *mupd)
 
 	pads = variant_romstage_gpio_table(&num);
 	gpio_configure_pads(pads, num);
+	pads = variant_romstage_sku_gpio_table(&num);
+	gpio_configure_pads(pads, num);
 
 	memset(&p, 0, sizeof(p));
 	variant_memory_params(&p);

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

@@ -383,6 +383,13 @@ const struct pad_config * __weak
 	return NULL;
 }
 
+const struct pad_config * __weak
+	variant_romstage_sku_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_DEVICE_NAME),
 	CROS_GPIO_WP_AH(GPIO_PCH_WP, CROS_GPIO_DEVICE_NAME),

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

@@ -21,6 +21,7 @@ const struct pad_config *variant_romstage_gpio_table(size_t *num);
 
 /* Config gpio by different sku id */
 const struct pad_config *variant_sku_gpio_table(size_t *num);
+const struct pad_config *variant_romstage_sku_gpio_table(size_t *num);
 
 enum memory_type {
 	MEMORY_LPDDR3,