v4.19.13 snapshot.
diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
new file mode 100644
index 0000000..4635f95
--- /dev/null
+++ b/include/linux/devfreq_cooling.h
@@ -0,0 +1,103 @@
+/*
+ * devfreq_cooling: Thermal cooling device implementation for devices using
+ * devfreq
+ *
+ * Copyright (C) 2014-2015 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __DEVFREQ_COOLING_H__
+#define __DEVFREQ_COOLING_H__
+
+#include <linux/devfreq.h>
+#include <linux/thermal.h>
+
+
+/**
+ * struct devfreq_cooling_power - Devfreq cooling power ops
+ * @get_static_power: Take voltage, in mV, and return the static power
+ * in mW. If NULL, the static power is assumed
+ * to be 0.
+ * @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
+ * return the dynamic power draw in mW. If NULL,
+ * a simple power model is used.
+ * @dyn_power_coeff: Coefficient for the simple dynamic power model in
+ * mW/(MHz mV mV).
+ * If get_dynamic_power() is NULL, then the
+ * dynamic power is calculated as
+ * @dyn_power_coeff * frequency * voltage^2
+ * @get_real_power: When this is set, the framework uses it to ask the
+ * device driver for the actual power.
+ * Some devices have more sophisticated methods
+ * (like power counters) to approximate the actual power
+ * that they use.
+ * This function provides more accurate data to the
+ * thermal governor. When the driver does not provide
+ * such function, framework just uses pre-calculated
+ * table and scale the power by 'utilization'
+ * (based on 'busy_time' and 'total_time' taken from
+ * devfreq 'last_status').
+ * The value returned by this function must be lower
+ * or equal than the maximum power value
+ * for the current state
+ * (which can be found in power_table[state]).
+ * When this interface is used, the power_table holds
+ * max total (static + dynamic) power value for each OPP.
+ */
+struct devfreq_cooling_power {
+ unsigned long (*get_static_power)(struct devfreq *devfreq,
+ unsigned long voltage);
+ unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
+ unsigned long freq,
+ unsigned long voltage);
+ int (*get_real_power)(struct devfreq *df, u32 *power,
+ unsigned long freq, unsigned long voltage);
+ unsigned long dyn_power_coeff;
+};
+
+#ifdef CONFIG_DEVFREQ_THERMAL
+
+struct thermal_cooling_device *
+of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power);
+struct thermal_cooling_device *
+of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
+struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
+void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
+
+#else /* !CONFIG_DEVFREQ_THERMAL */
+
+struct thermal_cooling_device *
+of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline struct thermal_cooling_device *
+of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline struct thermal_cooling_device *
+devfreq_cooling_register(struct devfreq *df)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline void
+devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
+{
+}
+
+#endif /* CONFIG_DEVFREQ_THERMAL */
+#endif /* __DEVFREQ_COOLING_H__ */