mb/google/octopus: add variant_early_override_gpio_table

Allow variants to override GPIO configurations of baseboard in the
bootblock stage.

BUG=b:137033609
BRANCH=octopus
TEST=built

Change-Id: I18d380cdf58f0f24e1bb1bff394ed8a91188a22c
Signed-off-by: Marco Chen <marcochen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34339
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/mainboard/google/octopus/bootblock.c

@@ -21,8 +21,8 @@
 
 void bootblock_mainboard_init(void)
 {
-	const struct pad_config *pads;
+	const struct pad_config *pads, *override_pads;
-	size_t num;
+	size_t num, override_num;
 
 	lpc_configure_pads();
 
@@ -34,5 +34,7 @@ void bootblock_mainboard_init(void)
 	mainboard_ec_init();
 
 	pads = variant_early_gpio_table(&num);
-	gpio_configure_pads(pads, num);
+	override_pads = variant_early_override_gpio_table(&override_num);
+	gpio_configure_pads_with_override(pads, num,
+			override_pads, override_num);
 }

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

@@ -299,6 +299,12 @@ const struct pad_config *__weak variant_override_gpio_table(size_t *num)
 	return NULL;
 }
 
+const struct pad_config *__weak variant_early_override_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}
+
 /* GPIOs needed prior to ramstage. */
 static const struct pad_config early_gpio_table[] = {
 	PAD_CFG_GPI(GPIO_190, NONE, DEEP), /* PCH_WP_OD */

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

@@ -26,6 +26,7 @@
 const struct pad_config *variant_base_gpio_table(size_t *num);
 const struct pad_config *variant_override_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
+const struct pad_config *variant_early_override_gpio_table(size_t *num);
 const struct pad_config *variant_sleep_gpio_table(size_t *num, int slp_typ);
 
 /* Baseboard default swizzle. Can be reused if swizzle is same. */