mb/google/skyrim: Add stubs to configure GPIOs

BUG=b:214415401
TEST=builds
BRANCH=none

Signed-off-by: Jon Murphy <jpmurphy@google.com>
Change-Id: Ieeda9aa0c18b5befea67d2849bd4114da0c348a3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62041
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

4 files changed, 61 insertions, 0 deletions

diff --git a/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc b/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc
new file mode 100644
index 0000000000..9fb63f5f43
--- /dev/null
+++ b/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc
@@ -0,0 +1,3 @@
+bootblock-y += gpio.c
+
+ramstage-y += gpio.c
diff --git a/src/mainboard/google/skyrim/variants/baseboard/gpio.c b/src/mainboard/google/skyrim/variants/baseboard/gpio.c
new file mode 100644
index 0000000000..94675feab8
--- /dev/null
+++ b/src/mainboard/google/skyrim/variants/baseboard/gpio.c
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <commonlib/helpers.h>
+
+/* GPIO configuration in ramstage*/
+static const struct soc_amd_gpio base_gpio_table[] = {
+	/* TODO: Fill gpio configuration */
+};
+
+/* Early GPIO configuration in bootblock */
+static const struct soc_amd_gpio bootblock_gpio_table[] = {
+	/* TODO: Fill bootblock gpio configuration */
+};
+
+__weak void variant_base_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
+{
+	*size = ARRAY_SIZE(base_gpio_table);
+	*gpio = base_gpio_table;
+}
+
+__weak void variant_override_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
+{
+	*size = 0;
+	*gpio = NULL;
+}
+
+__weak void variant_bootblock_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
+{
+	*size = ARRAY_SIZE(bootblock_gpio_table);
+	*gpio = bootblock_gpio_table;
+}
diff --git a/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/gpio.h b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/gpio.h
new file mode 100644
index 0000000000..b94afac4bf
--- /dev/null
+++ b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/gpio.h
@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __BASEBOARD_GPIO_H__
+#define __BASEBOARD_GPIO_H__
+
+#endif /* __BASEBOARD_GPIO_H__ */
diff --git a/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/variants.h
index 927af2f913..725baf8b08 100644
--- a/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/variants.h
+++ b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/variants.h
@@ -3,4 +3,23 @@
 #ifndef __BASEBOARD_VARIANTS_H__
 #define __BASEBOARD_VARIANTS_H__
 
+#include <amdblocks/gpio.h>
+
+/*
+ * This function provides base GPIO configuration table. It is typically provided by
+ * baseboard using a weak implementation. If GPIO configuration for a variant differs
+ * significantly from the baseboard, then the variant can also provide a strong implementation
+ * of this function.
+ */
+void variant_base_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
+
+/*
+ * This function allows variant to override any GPIOs that are different than the base GPIO
+ * configuration provided by variant_base_gpio_table().
+ */
+void variant_override_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
+
+/* This function provides GPIO init in bootblock. */
+void variant_bootblock_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */