1 files changed, 55 insertions, 0 deletions
diff --git a/zephyr/shim/chip/it8xxx2/gpio.c b/zephyr/shim/chip/it8xxx2/gpio.c
new file mode 100644
index 0000000000..148e1a97c9
--- /dev/null
+++ b/zephyr/shim/chip/it8xxx2/gpio.c
@@ -0,0 +1,55 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <device.h>
+#include <kernel.h>
+
+#include <logging/log.h>
+
+#include "gpio.h"
+#include "gpio/gpio.h"
+
+LOG_MODULE_REGISTER(shim_cros_gpio, LOG_LEVEL_ERR);
+
+static const struct unused_pin_config unused_pin_configs[] = {
+	UNUSED_GPIO_CONFIG_LIST
+};
+
+int gpio_config_unused_pins(void)
+{
+	for (size_t i = 0; i < ARRAY_SIZE(unused_pin_configs); ++i) {
+		int rv;
+		int flags;
+		const struct device *dev =
+			device_get_binding(unused_pin_configs[i].dev_name);
+
+		if (dev == NULL) {
+			LOG_ERR("Not found (%s)",
+				unused_pin_configs[i].dev_name);
+			return -ENOTSUP;
+		}
+
+		/*
+		 * Set the default setting for the floating IOs. The floating
+		 * IOs cause the leakage current. Set unused pins as input with
+		 * internal PU to prevent extra power consumption.
+		 */
+		if (unused_pin_configs[i].flags == 0)
+			flags = GPIO_INPUT | GPIO_PULL_UP;
+		else
+			flags = unused_pin_configs[i].flags;
+
+		rv = gpio_pin_configure(dev, unused_pin_configs[i].pin, flags);
+
+		if (rv < 0) {
+			LOG_ERR("Config failed %s-%d (%d)",
+				unused_pin_configs[i].dev_name,
+				unused_pin_configs[i].pin, rv);
+			return rv;
+		}
+	}
+
+	return 0;
+}