v4.19.13 snapshot.
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
new file mode 100644
index 0000000..f4c9fc0
--- /dev/null
+++ b/include/linux/scmi_protocol.h
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SCMI Message Protocol driver header
+ *
+ * Copyright (C) 2018 ARM Ltd.
+ */
+#include <linux/device.h>
+#include <linux/types.h>
+
+#define SCMI_MAX_STR_SIZE 16
+#define SCMI_MAX_NUM_RATES 16
+
+/**
+ * struct scmi_revision_info - version information structure
+ *
+ * @major_ver: Major ABI version. Change here implies risk of backward
+ * compatibility break.
+ * @minor_ver: Minor ABI version. Change here implies new feature addition,
+ * or compatible change in ABI.
+ * @num_protocols: Number of protocols that are implemented, excluding the
+ * base protocol.
+ * @num_agents: Number of agents in the system.
+ * @impl_ver: A vendor-specific implementation version.
+ * @vendor_id: A vendor identifier(Null terminated ASCII string)
+ * @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string)
+ */
+struct scmi_revision_info {
+ u16 major_ver;
+ u16 minor_ver;
+ u8 num_protocols;
+ u8 num_agents;
+ u32 impl_ver;
+ char vendor_id[SCMI_MAX_STR_SIZE];
+ char sub_vendor_id[SCMI_MAX_STR_SIZE];
+};
+
+struct scmi_clock_info {
+ char name[SCMI_MAX_STR_SIZE];
+ bool rate_discrete;
+ union {
+ struct {
+ int num_rates;
+ u64 rates[SCMI_MAX_NUM_RATES];
+ } list;
+ struct {
+ u64 min_rate;
+ u64 max_rate;
+ u64 step_size;
+ } range;
+ };
+};
+
+struct scmi_handle;
+
+/**
+ * struct scmi_clk_ops - represents the various operations provided
+ * by SCMI Clock Protocol
+ *
+ * @count_get: get the count of clocks provided by SCMI
+ * @info_get: get the information of the specified clock
+ * @rate_get: request the current clock rate of a clock
+ * @rate_set: set the clock rate of a clock
+ * @enable: enables the specified clock
+ * @disable: disables the specified clock
+ */
+struct scmi_clk_ops {
+ int (*count_get)(const struct scmi_handle *handle);
+
+ const struct scmi_clock_info *(*info_get)
+ (const struct scmi_handle *handle, u32 clk_id);
+ int (*rate_get)(const struct scmi_handle *handle, u32 clk_id,
+ u64 *rate);
+ int (*rate_set)(const struct scmi_handle *handle, u32 clk_id,
+ u32 config, u64 rate);
+ int (*enable)(const struct scmi_handle *handle, u32 clk_id);
+ int (*disable)(const struct scmi_handle *handle, u32 clk_id);
+};
+
+/**
+ * struct scmi_perf_ops - represents the various operations provided
+ * by SCMI Performance Protocol
+ *
+ * @limits_set: sets limits on the performance level of a domain
+ * @limits_get: gets limits on the performance level of a domain
+ * @level_set: sets the performance level of a domain
+ * @level_get: gets the performance level of a domain
+ * @device_domain_id: gets the scmi domain id for a given device
+ * @transition_latency_get: gets the DVFS transition latency for a given device
+ * @device_opps_add: adds all the OPPs for a given device
+ * @freq_set: sets the frequency for a given device using sustained frequency
+ * to sustained performance level mapping
+ * @freq_get: gets the frequency for a given device using sustained frequency
+ * to sustained performance level mapping
+ */
+struct scmi_perf_ops {
+ int (*limits_set)(const struct scmi_handle *handle, u32 domain,
+ u32 max_perf, u32 min_perf);
+ int (*limits_get)(const struct scmi_handle *handle, u32 domain,
+ u32 *max_perf, u32 *min_perf);
+ int (*level_set)(const struct scmi_handle *handle, u32 domain,
+ u32 level, bool poll);
+ int (*level_get)(const struct scmi_handle *handle, u32 domain,
+ u32 *level, bool poll);
+ int (*device_domain_id)(struct device *dev);
+ int (*transition_latency_get)(const struct scmi_handle *handle,
+ struct device *dev);
+ int (*device_opps_add)(const struct scmi_handle *handle,
+ struct device *dev);
+ int (*freq_set)(const struct scmi_handle *handle, u32 domain,
+ unsigned long rate, bool poll);
+ int (*freq_get)(const struct scmi_handle *handle, u32 domain,
+ unsigned long *rate, bool poll);
+};
+
+/**
+ * struct scmi_power_ops - represents the various operations provided
+ * by SCMI Power Protocol
+ *
+ * @num_domains_get: get the count of power domains provided by SCMI
+ * @name_get: gets the name of a power domain
+ * @state_set: sets the power state of a power domain
+ * @state_get: gets the power state of a power domain
+ */
+struct scmi_power_ops {
+ int (*num_domains_get)(const struct scmi_handle *handle);
+ char *(*name_get)(const struct scmi_handle *handle, u32 domain);
+#define SCMI_POWER_STATE_TYPE_SHIFT 30
+#define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
+#define SCMI_POWER_STATE_PARAM(type, id) \
+ ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
+ ((id) & SCMI_POWER_STATE_ID_MASK))
+#define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
+#define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
+ int (*state_set)(const struct scmi_handle *handle, u32 domain,
+ u32 state);
+ int (*state_get)(const struct scmi_handle *handle, u32 domain,
+ u32 *state);
+};
+
+struct scmi_sensor_info {
+ u32 id;
+ u8 type;
+ char name[SCMI_MAX_STR_SIZE];
+};
+
+/*
+ * Partial list from Distributed Management Task Force (DMTF) specification:
+ * DSP0249 (Platform Level Data Model specification)
+ */
+enum scmi_sensor_class {
+ NONE = 0x0,
+ TEMPERATURE_C = 0x2,
+ VOLTAGE = 0x5,
+ CURRENT = 0x6,
+ POWER = 0x7,
+ ENERGY = 0x8,
+};
+
+/**
+ * struct scmi_sensor_ops - represents the various operations provided
+ * by SCMI Sensor Protocol
+ *
+ * @count_get: get the count of sensors provided by SCMI
+ * @info_get: get the information of the specified sensor
+ * @configuration_set: control notifications on cross-over events for
+ * the trip-points
+ * @trip_point_set: selects and configures a trip-point of interest
+ * @reading_get: gets the current value of the sensor
+ */
+struct scmi_sensor_ops {
+ int (*count_get)(const struct scmi_handle *handle);
+
+ const struct scmi_sensor_info *(*info_get)
+ (const struct scmi_handle *handle, u32 sensor_id);
+ int (*configuration_set)(const struct scmi_handle *handle,
+ u32 sensor_id);
+ int (*trip_point_set)(const struct scmi_handle *handle, u32 sensor_id,
+ u8 trip_id, u64 trip_value);
+ int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
+ bool async, u64 *value);
+};
+
+/**
+ * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
+ *
+ * @dev: pointer to the SCMI device
+ * @version: pointer to the structure containing SCMI version information
+ * @power_ops: pointer to set of power protocol operations
+ * @perf_ops: pointer to set of performance protocol operations
+ * @clk_ops: pointer to set of clock protocol operations
+ * @sensor_ops: pointer to set of sensor protocol operations
+ * @perf_priv: pointer to private data structure specific to performance
+ * protocol(for internal use only)
+ * @clk_priv: pointer to private data structure specific to clock
+ * protocol(for internal use only)
+ * @power_priv: pointer to private data structure specific to power
+ * protocol(for internal use only)
+ * @sensor_priv: pointer to private data structure specific to sensors
+ * protocol(for internal use only)
+ */
+struct scmi_handle {
+ struct device *dev;
+ struct scmi_revision_info *version;
+ struct scmi_perf_ops *perf_ops;
+ struct scmi_clk_ops *clk_ops;
+ struct scmi_power_ops *power_ops;
+ struct scmi_sensor_ops *sensor_ops;
+ /* for protocol internal use */
+ void *perf_priv;
+ void *clk_priv;
+ void *power_priv;
+ void *sensor_priv;
+};
+
+enum scmi_std_protocol {
+ SCMI_PROTOCOL_BASE = 0x10,
+ SCMI_PROTOCOL_POWER = 0x11,
+ SCMI_PROTOCOL_SYSTEM = 0x12,
+ SCMI_PROTOCOL_PERF = 0x13,
+ SCMI_PROTOCOL_CLOCK = 0x14,
+ SCMI_PROTOCOL_SENSOR = 0x15,
+};
+
+struct scmi_device {
+ u32 id;
+ u8 protocol_id;
+ struct device dev;
+ struct scmi_handle *handle;
+};
+
+#define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
+
+struct scmi_device *
+scmi_device_create(struct device_node *np, struct device *parent, int protocol);
+void scmi_device_destroy(struct scmi_device *scmi_dev);
+
+struct scmi_device_id {
+ u8 protocol_id;
+};
+
+struct scmi_driver {
+ const char *name;
+ int (*probe)(struct scmi_device *sdev);
+ void (*remove)(struct scmi_device *sdev);
+ const struct scmi_device_id *id_table;
+
+ struct device_driver driver;
+};
+
+#define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
+
+#ifdef CONFIG_ARM_SCMI_PROTOCOL
+int scmi_driver_register(struct scmi_driver *driver,
+ struct module *owner, const char *mod_name);
+void scmi_driver_unregister(struct scmi_driver *driver);
+#else
+static inline int
+scmi_driver_register(struct scmi_driver *driver, struct module *owner,
+ const char *mod_name)
+{
+ return -EINVAL;
+}
+
+static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
+#endif /* CONFIG_ARM_SCMI_PROTOCOL */
+
+#define scmi_register(driver) \
+ scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
+#define scmi_unregister(driver) \
+ scmi_driver_unregister(driver)
+
+/**
+ * module_scmi_driver() - Helper macro for registering a scmi driver
+ * @__scmi_driver: scmi_driver structure
+ *
+ * Helper macro for scmi drivers to set up proper module init / exit
+ * functions. Replaces module_init() and module_exit() and keeps people from
+ * printing pointless things to the kernel log when their driver is loaded.
+ */
+#define module_scmi_driver(__scmi_driver) \
+ module_driver(__scmi_driver, scmi_register, scmi_unregister)
+
+typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
+int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
+void scmi_protocol_unregister(int protocol_id);