mb/google/dedede/var/waddledee: Enable GPIO based I2C Multiplexer

The camera sensor component chosen for UFC and WFC have an address
conflict. Resolve it by enabling GPIO based I2C Multiplexer. Also
configure the GPIO that is used as select line.

BUG=b:169444894
TEST=Build and boot waddledee to OS. Ensure that the ACPI identifiers
are added for I2C devices multiplexed using I2C MUX under the
appropriate scope.

Change-Id: I9b09e063b4377587019ade9e6e194f4aadcdd312
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45912
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/mainboard/google/dedede/variants/waddledee/gpio.c b/src/mainboard/google/dedede/variants/waddledee/gpio.c
new file mode 100644
index 0000000000..0905e8f217
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/waddledee/gpio.c
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+
+/* Pad configuration in ramstage*/
+static const struct pad_config gpio_table[] = {
+	/* E5  : AP_SUB_IO_2 */
+	PAD_CFG_GPO(GPP_E5, 0, PLTRST),
+};
+
+const struct pad_config *variant_override_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(gpio_table);
+	return gpio_table;
+}