1 files changed, 41 insertions, 0 deletions
diff --git a/zephyr/shim/chip/it8xxx2/power_policy.c b/zephyr/shim/chip/it8xxx2/power_policy.c
new file mode 100644
index 0000000000..62e2a14ab8
--- /dev/null
+++ b/zephyr/shim/chip/it8xxx2/power_policy.c
@@ -0,0 +1,41 @@
+/* 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 <pm/pm.h>
+#include <pm/policy.h>
+#include <soc.h>
+#include <zephyr.h>
+
+#include "system.h"
+
+static const struct pm_state_info pm_states[] =
+	PM_STATE_INFO_LIST_FROM_DT_CPU(DT_NODELABEL(cpu0));
+
+/* CROS PM policy handler */
+struct pm_state_info pm_policy_next_state(uint8_t cpu, int32_t ticks)
+{
+	ARG_UNUSED(cpu);
+
+	/* Deep sleep is allowed */
+	if (DEEP_SLEEP_ALLOWED) {
+		/*
+		 * If there are multiple power states, iterating backward
+		 * is needed to take priority into account.
+		 */
+		for (int i = 0; i < ARRAY_SIZE(pm_states); i++) {
+			/*
+			 * To check if given power state is enabled and
+			 * could be used.
+			 */
+			if (!pm_constraint_get(pm_states[i].state)) {
+				continue;
+			}
+
+			return pm_states[i];
+		}
+	}
+
+	return (struct pm_state_info){PM_STATE_ACTIVE, 0, 0};
+}