diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c
index c9e5e451b377..f2d10c5a55ae 100644
--- a/drivers/firmware/arm_scmi/base.c
+++ b/drivers/firmware/arm_scmi/base.c
@@ -264,7 +264,7 @@ static int scmi_base_error_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
-static int scmi_base_set_notify_enabled(const void *ph,
+static int scmi_base_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;
@@ -276,7 +276,7 @@ static int scmi_base_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_base_fill_custom_report(const void *ph,
+static void *scmi_base_fill_custom_report(const struct scmi_protocol_handle *ph,
 					  u8 evt_id, ktime_t timestamp,
 					  const void *payld, size_t payld_sz,
 					  void *report, u32 *src_id)
diff --git a/drivers/firmware/arm_scmi/notify.h b/drivers/firmware/arm_scmi/notify.h
index 2281a740ae96..3915bcd76242 100644
--- a/drivers/firmware/arm_scmi/notify.h
+++ b/drivers/firmware/arm_scmi/notify.h
@@ -50,10 +50,10 @@ struct scmi_protocol_handle;
  *	    process context.
  */
 struct scmi_event_ops {
-	int (*get_num_sources)(const void *handle);
-	int (*set_notify_enabled)(const void *handle,
+	int (*get_num_sources)(const struct scmi_protocol_handle *ph);
+	int (*set_notify_enabled)(const struct scmi_protocol_handle *ph,
 				  u8 evt_id, u32 src_id, bool enabled);
-	void *(*fill_custom_report)(const void *handle,
+	void *(*fill_custom_report)(const struct scmi_protocol_handle *ph,
 				    u8 evt_id, ktime_t timestamp,
 				    const void *payld, size_t payld_sz,
 				    void *report, u32 *src_id);
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 9cfc42c8fffd..49a33fc1c319 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -761,7 +761,7 @@ static const struct scmi_perf_proto_ops perf_proto_ops = {
 	.fast_switch_possible = scmi_fast_switch_possible,
 };
 
-static int scmi_perf_set_notify_enabled(const void *ph,
+static int scmi_perf_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					u8 evt_id, u32 src_id, bool enable)
 {
 	int ret, cmd_id;
@@ -778,7 +778,7 @@ static int scmi_perf_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_perf_fill_custom_report(const void *ph,
+static void *scmi_perf_fill_custom_report(const struct scmi_protocol_handle *ph,
 					  u8 evt_id, ktime_t timestamp,
 					  const void *payld, size_t payld_sz,
 					  void *report, u32 *src_id)
@@ -826,10 +826,9 @@ static void *scmi_perf_fill_custom_report(const void *ph,
 	return rep;
 }
 
-static int scmi_perf_get_num_sources(const void *ph)
+static int scmi_perf_get_num_sources(const struct scmi_protocol_handle *ph)
 {
-	struct scmi_perf_info *pi =
-		((const struct scmi_protocol_handle *)ph)->get_priv(ph);
+	struct scmi_perf_info *pi = ph->get_priv(ph);
 
 	if (!pi)
 		return -EINVAL;
diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
index 06e3ab17a0eb..3e453d9bcbc8 100644
--- a/drivers/firmware/arm_scmi/power.c
+++ b/drivers/firmware/arm_scmi/power.c
@@ -211,7 +211,7 @@ static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
-static int scmi_power_set_notify_enabled(const void *ph,
+static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					 u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;
@@ -224,10 +224,11 @@ static int scmi_power_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_power_fill_custom_report(const void *ph,
-					   u8 evt_id, ktime_t timestamp,
-					   const void *payld, size_t payld_sz,
-					   void *report, u32 *src_id)
+static void *
+scmi_power_fill_custom_report(const struct scmi_protocol_handle *ph,
+			      u8 evt_id, ktime_t timestamp,
+			      const void *payld, size_t payld_sz,
+			      void *report, u32 *src_id)
 {
 	const struct scmi_power_state_notify_payld *p = payld;
 	struct scmi_power_state_changed_report *r = report;
@@ -244,10 +245,9 @@ static void *scmi_power_fill_custom_report(const void *ph,
 	return r;
 }
 
-static int scmi_power_get_num_sources(const void *ph)
+static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
 {
-	struct scmi_power_info *pinfo =
-		((const struct scmi_protocol_handle *)ph)->get_priv(ph);
+	struct scmi_power_info *pinfo = ph->get_priv(ph);
 
 	if (!pinfo)
 		return -EINVAL;
diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
index 3856ceed2bd7..bd28d4e9664d 100644
--- a/drivers/firmware/arm_scmi/reset.c
+++ b/drivers/firmware/arm_scmi/reset.c
@@ -225,7 +225,7 @@ static int scmi_reset_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
-static int scmi_reset_set_notify_enabled(const void *ph,
+static int scmi_reset_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					 u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;
@@ -238,10 +238,11 @@ static int scmi_reset_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_reset_fill_custom_report(const void *ph,
-					   u8 evt_id, ktime_t timestamp,
-					   const void *payld, size_t payld_sz,
-					   void *report, u32 *src_id)
+static void *
+scmi_reset_fill_custom_report(const struct scmi_protocol_handle *ph,
+			      u8 evt_id, ktime_t timestamp,
+			      const void *payld, size_t payld_sz,
+			      void *report, u32 *src_id)
 {
 	const struct scmi_reset_issued_notify_payld *p = payld;
 	struct scmi_reset_issued_report *r = report;
@@ -258,10 +259,9 @@ static void *scmi_reset_fill_custom_report(const void *ph,
 	return r;
 }
 
-static int scmi_reset_get_num_sources(const void *ph)
+static int scmi_reset_get_num_sources(const struct scmi_protocol_handle *ph)
 {
-	struct scmi_reset_info *pinfo =
-		((const struct scmi_protocol_handle *)ph)->get_priv(ph);
+	struct scmi_reset_info *pinfo = ph->get_priv(ph);
 
 	if (!pinfo)
 		return -EINVAL;
diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index 478585f644fa..edc08d9f8daa 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -834,7 +834,7 @@ static const struct scmi_sensor_proto_ops sensor_proto_ops = {
 	.config_set = scmi_sensor_config_set,
 };
 
-static int scmi_sensor_set_notify_enabled(const void *ph,
+static int scmi_sensor_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					  u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;
@@ -858,10 +858,11 @@ static int scmi_sensor_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_sensor_fill_custom_report(const void *ph,
-					    u8 evt_id, ktime_t timestamp,
-					    const void *payld, size_t payld_sz,
-					    void *report, u32 *src_id)
+static void *
+scmi_sensor_fill_custom_report(const struct scmi_protocol_handle *ph,
+			       u8 evt_id, ktime_t timestamp,
+			       const void *payld, size_t payld_sz,
+			       void *report, u32 *src_id)
 {
 	void *rep = NULL;
 
@@ -888,8 +889,7 @@ static void *scmi_sensor_fill_custom_report(const void *ph,
 		struct scmi_sensor_info *s;
 		const struct scmi_sensor_update_notify_payld *p = payld;
 		struct scmi_sensor_update_report *r = report;
-		struct sensors_info *sinfo =
-			((const struct scmi_protocol_handle *)ph)->get_priv(ph);
+		struct sensors_info *sinfo = ph->get_priv(ph);
 
 		/* payld_sz is variable for this event */
 		r->sensor_id = le32_to_cpu(p->sensor_id);
@@ -919,10 +919,9 @@ static void *scmi_sensor_fill_custom_report(const void *ph,
 	return rep;
 }
 
-static int scmi_sensor_get_num_sources(const void *ph)
+static int scmi_sensor_get_num_sources(const struct scmi_protocol_handle *ph)
 {
-	struct sensors_info *si =
-		((const struct scmi_protocol_handle *)ph)->get_priv(ph);
+	struct sensors_info *si = ph->get_priv(ph);
 
 	return si->num_sensors;
 }
diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c
index a23c1f505b56..97ad20a51d72 100644
--- a/drivers/firmware/arm_scmi/system.c
+++ b/drivers/firmware/arm_scmi/system.c
@@ -53,7 +53,7 @@ static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
-static int scmi_system_set_notify_enabled(const void *ph,
+static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					  u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;
@@ -65,10 +65,11 @@ static int scmi_system_set_notify_enabled(const void *ph,
 	return ret;
 }
 
-static void *scmi_system_fill_custom_report(const void *ph,
-					    u8 evt_id, ktime_t timestamp,
-					    const void *payld, size_t payld_sz,
-					    void *report, u32 *src_id)
+static void *
+scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
+			       u8 evt_id, ktime_t timestamp,
+			       const void *payld, size_t payld_sz,
+			       void *report, u32 *src_id)
 {
 	const struct scmi_system_power_state_notifier_payld *p = payld;
 	struct scmi_system_power_state_notifier_report *r = report;
