firmware: arm_scmi: add a getter for power of performance states

The SCMI protocol can be used to get power estimates from firmware
corresponding to each performance state of a device. Although these power
costs are already managed by the SCMI firmware driver, they are not
exposed to any external subsystem yet.

Fix this by adding a new get_power() interface to the exisiting perf_ops
defined for the SCMI protocol.

Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index f4c9fc0fc755..3105055c00a7 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -91,6 +91,8 @@ struct scmi_clk_ops {
  *      to sustained performance level mapping
  * @freq_get: gets the frequency for a given device using sustained frequency
  *      to sustained performance level mapping
+ * @est_power_get: gets the estimated power cost for a given performance domain
+ *      at a given frequency
  */
 struct scmi_perf_ops {
         int (*limits_set)(const struct scmi_handle *handle, u32 domain,
@@ -110,6 +112,8 @@ struct scmi_perf_ops {
                         unsigned long rate, bool poll);
         int (*freq_get)(const struct scmi_handle *handle, u32 domain,
                         unsigned long *rate, bool poll);
+        int (*est_power_get)(const struct scmi_handle *handle, u32 domain,
+                             unsigned long *rate, unsigned long *power);
 };
 
 /**