Merge tag 'soc-drivers-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC driver updates from Arnd Bergmann:
 "This is the usual mix of updates for drivers that are used on (mostly
  ARM) SoCs with no other top-level subsystem tree, including:

   - The SCMI firmware subsystem gains support for version 3.2 of the
     specification and updates to the notification code

   - Feature updates for Tegra and Qualcomm platforms for added hardware
     support

   - A number of platforms get soc_device additions for identifying
     newly added chips from Renesas, Qualcomm, Mediatek and Google

   - Trivial improvements for firmware and memory drivers amongst
     others, in particular 'const' annotations throughout multiple
     subsystems"

* tag 'soc-drivers-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (96 commits)
  tee: make tee_bus_type const
  soc: qcom: aoss: add missing kerneldoc for qmp members
  soc: qcom: geni-se: drop unused kerneldoc struct geni_wrapper param
  soc: qcom: spm: fix building with CONFIG_REGULATOR=n
  bus: ti-sysc: constify the struct device_type usage
  memory: stm32-fmc2-ebi: keep power domain on
  memory: stm32-fmc2-ebi: add MP25 RIF support
  memory: stm32-fmc2-ebi: add MP25 support
  memory: stm32-fmc2-ebi: check regmap_read return value
  dt-bindings: memory-controller: st,stm32: add MP25 support
  dt-bindings: bus: imx-weim: convert to YAML
  watchdog: s3c2410_wdt: use exynos_get_pmu_regmap_by_phandle() for PMU regs
  soc: samsung: exynos-pmu: Add regmap support for SoCs that protect PMU regs
  MAINTAINERS: Update SCMI entry with HWMON driver
  MAINTAINERS: samsung: gs101: match patches touching Google Tensor SoC
  memory: tegra: Fix indentation
  memory: tegra: Add BPMP and ICC info for DLA clients
  memory: tegra: Correct DLA client names
  dt-bindings: memory: renesas,rpc-if: Document R-Car V4M support
  firmware: arm_scmi: Update the supported clock protocol version
  ...

17 files changed, 618 insertions, 74 deletions

diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 1c7940ba5539..2f557e90f2eb 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -105,7 +105,7 @@ static struct attribute *ffa_device_attributes_attrs[] = {
 };
 ATTRIBUTE_GROUPS(ffa_device_attributes);
 
-struct bus_type ffa_bus_type = {
+const struct bus_type ffa_bus_type = {
 	.name		= "arm_ffa",
 	.match		= ffa_device_match,
 	.probe		= ffa_device_probe,
diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index c15928b8c5cc..77c78be6e79c 100644
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -141,6 +141,17 @@ out:
 	return ret;
 }
 
+static int scmi_protocol_table_register(const struct scmi_device_id *id_table)
+{
+	int ret = 0;
+	const struct scmi_device_id *entry;
+
+	for (entry = id_table; entry->name && ret == 0; entry++)
+		ret = scmi_protocol_device_request(entry);
+
+	return ret;
+}
+
 /**
  * scmi_protocol_device_unrequest  - Helper to unrequest a device
  *
@@ -186,6 +197,15 @@ static void scmi_protocol_device_unrequest(const struct scmi_device_id *id_table
 	mutex_unlock(&scmi_requested_devices_mtx);
 }
 
+static void
+scmi_protocol_table_unregister(const struct scmi_device_id *id_table)
+{
+	const struct scmi_device_id *entry;
+
+	for (entry = id_table; entry->name; entry++)
+		scmi_protocol_device_unrequest(entry);
+}
+
 static const struct scmi_device_id *
 scmi_dev_match_id(struct scmi_device *scmi_dev, struct scmi_driver *scmi_drv)
 {
@@ -263,7 +283,7 @@ static void scmi_dev_remove(struct device *dev)
 		scmi_drv->remove(scmi_dev);
 }
 
-struct bus_type scmi_bus_type = {
+const struct bus_type scmi_bus_type = {
 	.name =	"scmi_protocol",
 	.match = scmi_dev_match,
 	.probe = scmi_dev_probe,
@@ -279,7 +299,7 @@ int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
 	if (!driver->probe)
 		return -EINVAL;
 
-	retval = scmi_protocol_device_request(driver->id_table);
+	retval = scmi_protocol_table_register(driver->id_table);
 	if (retval)
 		return retval;
 
@@ -299,7 +319,7 @@ EXPORT_SYMBOL_GPL(scmi_driver_register);
 void scmi_driver_unregister(struct scmi_driver *driver)
 {
 	driver_unregister(&driver->driver);
-	scmi_protocol_device_unrequest(driver->id_table);
+	scmi_protocol_table_unregister(driver->id_table);
 }
 EXPORT_SYMBOL_GPL(scmi_driver_unregister);
 
diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index e2050adbf85c..134019297d08 100644
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -13,7 +13,7 @@
 #include "notify.h"
 
 /* Updated only after ALL the mandatory features for that version are merged */
-#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x20000
+#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x30000
 
 enum scmi_clock_protocol_cmd {
 	CLOCK_ATTRIBUTES = 0x3,
@@ -28,8 +28,13 @@ enum scmi_clock_protocol_cmd {
 	CLOCK_POSSIBLE_PARENTS_GET = 0xC,
 	CLOCK_PARENT_SET = 0xD,
 	CLOCK_PARENT_GET = 0xE,
+	CLOCK_GET_PERMISSIONS = 0xF,
 };
 
+#define CLOCK_STATE_CONTROL_ALLOWED	BIT(31)
+#define CLOCK_PARENT_CONTROL_ALLOWED	BIT(30)
+#define CLOCK_RATE_CONTROL_ALLOWED	BIT(29)
+
 enum clk_state {
 	CLK_STATE_DISABLE,
 	CLK_STATE_ENABLE,
@@ -49,6 +54,8 @@ struct scmi_msg_resp_clock_attributes {
 #define SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(x)	((x) & BIT(30))
 #define SUPPORTS_EXTENDED_NAMES(x)		((x) & BIT(29))
 #define SUPPORTS_PARENT_CLOCK(x)		((x) & BIT(28))
+#define SUPPORTS_EXTENDED_CONFIG(x)		((x) & BIT(27))
+#define SUPPORTS_GET_PERMISSIONS(x)		((x) & BIT(1))
 	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 	__le32 clock_enable_latency;
 };
@@ -152,14 +159,18 @@ struct clock_info {
 	u32 version;
 	int num_clocks;
 	int max_async_req;
+	bool notify_rate_changed_cmd;
+	bool notify_rate_change_requested_cmd;
 	atomic_t cur_async_req;
 	struct scmi_clock_info *clk;
 	int (*clock_config_set)(const struct scmi_protocol_handle *ph,
 				u32 clk_id, enum clk_state state,
-				u8 oem_type, u32 oem_val, bool atomic);
+				enum scmi_clock_oem_config oem_type,
+				u32 oem_val, bool atomic);
 	int (*clock_config_get)(const struct scmi_protocol_handle *ph,
-				u32 clk_id, u8 oem_type, u32 *attributes,
-				bool *enabled, u32 *oem_val, bool atomic);
+				u32 clk_id, enum scmi_clock_oem_config oem_type,
+				u32 *attributes, bool *enabled, u32 *oem_val,
+				bool atomic);
 };
 
 static enum scmi_clock_protocol_cmd evt_2_cmd[] = {
@@ -167,6 +178,15 @@ static enum scmi_clock_protocol_cmd evt_2_cmd[] = {
 	CLOCK_RATE_CHANGE_REQUESTED_NOTIFY,
 };
 
+static inline struct scmi_clock_info *
+scmi_clock_domain_lookup(struct clock_info *ci, u32 clk_id)
+{
+	if (clk_id >= ci->num_clocks)
+		return ERR_PTR(-EINVAL);
+
+	return ci->clk + clk_id;
+}
+
 static int
 scmi_clock_protocol_attributes_get(const struct scmi_protocol_handle *ph,
 				   struct clock_info *ci)
@@ -189,6 +209,17 @@ scmi_clock_protocol_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret) {
+		if (!ph->hops->protocol_msg_check(ph, CLOCK_RATE_NOTIFY, NULL))
+			ci->notify_rate_changed_cmd = true;
+
+		if (!ph->hops->protocol_msg_check(ph,
+						  CLOCK_RATE_CHANGE_REQUESTED_NOTIFY,
+						  NULL))
+			ci->notify_rate_change_requested_cmd = true;
+	}
+
 	return ret;
 }
 
@@ -284,14 +315,44 @@ static int scmi_clock_possible_parents(const struct scmi_protocol_handle *ph, u3
 	return ret;
 }
 
+static int
+scmi_clock_get_permissions(const struct scmi_protocol_handle *ph, u32 clk_id,
+			   struct scmi_clock_info *clk)
+{
+	struct scmi_xfer *t;
+	u32 perm;
+	int ret;
+
+	ret = ph->xops->xfer_get_init(ph, CLOCK_GET_PERMISSIONS,
+				      sizeof(clk_id), sizeof(perm), &t);
+	if (ret)
+		return ret;
+
+	put_unaligned_le32(clk_id, t->tx.buf);
+
+	ret = ph->xops->do_xfer(ph, t);
+	if (!ret) {
+		perm = get_unaligned_le32(t->rx.buf);
+
+		clk->state_ctrl_forbidden = !(perm & CLOCK_STATE_CONTROL_ALLOWED);
+		clk->rate_ctrl_forbidden = !(perm & CLOCK_RATE_CONTROL_ALLOWED);
+		clk->parent_ctrl_forbidden = !(perm & CLOCK_PARENT_CONTROL_ALLOWED);
+	}
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
 static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
-				     u32 clk_id, struct scmi_clock_info *clk,
+				     u32 clk_id, struct clock_info *cinfo,
 				     u32 version)
 {
 	int ret;
 	u32 attributes;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_clock_attributes *attr;
+	struct scmi_clock_info *clk = cinfo->clk + clk_id;
 
 	ret = ph->xops->xfer_get_init(ph, CLOCK_ATTRIBUTES,
 				      sizeof(clk_id), sizeof(*attr), &t);
@@ -324,12 +385,20 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
 						    NULL, clk->name,
 						    SCMI_MAX_STR_SIZE);
 
-		if (SUPPORTS_RATE_CHANGED_NOTIF(attributes))
+		if (cinfo->notify_rate_changed_cmd &&
+		    SUPPORTS_RATE_CHANGED_NOTIF(attributes))
 			clk->rate_changed_notifications = true;
-		if (SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(attributes))
+		if (cinfo->notify_rate_change_requested_cmd &&
+		    SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(attributes))
 			clk->rate_change_requested_notifications = true;
-		if (SUPPORTS_PARENT_CLOCK(attributes))
-			scmi_clock_possible_parents(ph, clk_id, clk);
+		if (PROTOCOL_REV_MAJOR(version) >= 0x3) {
+			if (SUPPORTS_PARENT_CLOCK(attributes))
+				scmi_clock_possible_parents(ph, clk_id, clk);
+			if (SUPPORTS_GET_PERMISSIONS(attributes))
+				scmi_clock_get_permissions(ph, clk_id, clk);
+			if (SUPPORTS_EXTENDED_CONFIG(attributes))
+				clk->extended_config = true;
+		}
 	}
 
 	return ret;
@@ -502,6 +571,14 @@ static int scmi_clock_rate_set(const struct scmi_protocol_handle *ph,
 	struct scmi_xfer *t;
 	struct scmi_clock_set_rate *cfg;
 	struct clock_info *ci = ph->get_priv(ph);
+	struct scmi_clock_info *clk;
+
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	if (clk->rate_ctrl_forbidden)
+		return -EACCES;
 
 	ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_SET, sizeof(*cfg), 0, &t);
 	if (ret)
@@ -543,7 +620,8 @@ static int scmi_clock_rate_set(const struct scmi_protocol_handle *ph,
 
 static int
 scmi_clock_config_set(const struct scmi_protocol_handle *ph, u32 clk_id,
-		      enum clk_state state, u8 __unused0, u32 __unused1,
+		      enum clk_state state,
+		      enum scmi_clock_oem_config __unused0, u32 __unused1,
 		      bool atomic)
 {
 	int ret;
@@ -580,14 +658,16 @@ scmi_clock_set_parent(const struct scmi_protocol_handle *ph, u32 clk_id,
 	struct clock_info *ci = ph->get_priv(ph);
 	struct scmi_clock_info *clk;
 
-	if (clk_id >= ci->num_clocks)
-		return -EINVAL;
-
-	clk = ci->clk + clk_id;
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
 	if (parent_id >= clk->num_parents)
 		return -EINVAL;
 
+	if (clk->parent_ctrl_forbidden)
+		return -EACCES;
+
 	ret = ph->xops->xfer_get_init(ph, CLOCK_PARENT_SET,
 				      sizeof(*cfg), 0, &t);
 	if (ret)
@@ -628,10 +708,11 @@ scmi_clock_get_parent(const struct scmi_protocol_handle *ph, u32 clk_id,
 	return ret;
 }
 
-/* For SCMI clock v2.1 and onwards */
+/* For SCMI clock v3.0 and onwards */
 static int
 scmi_clock_config_set_v2(const struct scmi_protocol_handle *ph, u32 clk_id,
-			 enum clk_state state, u8 oem_type, u32 oem_val,
+			 enum clk_state state,
+			 enum scmi_clock_oem_config oem_type, u32 oem_val,
 			 bool atomic)
 {
 	int ret;
@@ -671,6 +752,14 @@ static int scmi_clock_enable(const struct scmi_protocol_handle *ph, u32 clk_id,
 			     bool atomic)
 {
 	struct clock_info *ci = ph->get_priv(ph);
+	struct scmi_clock_info *clk;
+
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	if (clk->state_ctrl_forbidden)
+		return -EACCES;
 
 	return ci->clock_config_set(ph, clk_id, CLK_STATE_ENABLE,
 				    NULL_OEM_TYPE, 0, atomic);
@@ -680,16 +769,24 @@ static int scmi_clock_disable(const struct scmi_protocol_handle *ph, u32 clk_id,
 			      bool atomic)
 {
 	struct clock_info *ci = ph->get_priv(ph);
+	struct scmi_clock_info *clk;
+
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	if (clk->state_ctrl_forbidden)
+		return -EACCES;
 
 	return ci->clock_config_set(ph, clk_id, CLK_STATE_DISABLE,
 				    NULL_OEM_TYPE, 0, atomic);
 }
 
-/* For SCMI clock v2.1 and onwards */
+/* For SCMI clock v3.0 and onwards */
 static int
 scmi_clock_config_get_v2(const struct scmi_protocol_handle *ph, u32 clk_id,
-			 u8 oem_type, u32 *attributes, bool *enabled,
-			 u32 *oem_val, bool atomic)
+			 enum scmi_clock_oem_config oem_type, u32 *attributes,
+			 bool *enabled, u32 *oem_val, bool atomic)
 {
 	int ret;
 	u32 flags;
@@ -730,8 +827,8 @@ scmi_clock_config_get_v2(const struct scmi_protocol_handle *ph, u32 clk_id,
 
 static int
 scmi_clock_config_get(const struct scmi_protocol_handle *ph, u32 clk_id,
-		      u8 oem_type, u32 *attributes, bool *enabled,
-		      u32 *oem_val, bool atomic)
+		      enum scmi_clock_oem_config oem_type, u32 *attributes,
+		      bool *enabled, u32 *oem_val, bool atomic)
 {
 	int ret;
 	struct scmi_xfer *t;
@@ -768,20 +865,38 @@ static int scmi_clock_state_get(const struct scmi_protocol_handle *ph,
 }
 
 static int scmi_clock_config_oem_set(const struct scmi_protocol_handle *ph,
-				     u32 clk_id, u8 oem_type, u32 oem_val,
-				     bool atomic)
+				     u32 clk_id,
+				     enum scmi_clock_oem_config oem_type,
+				     u32 oem_val, bool atomic)
 {
 	struct clock_info *ci = ph->get_priv(ph);
+	struct scmi_clock_info *clk;
+
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	if (!clk->extended_config)
+		return -EOPNOTSUPP;
 
 	return ci->clock_config_set(ph, clk_id, CLK_STATE_UNCHANGED,
 				    oem_type, oem_val, atomic);
 }
 
 static int scmi_clock_config_oem_get(const struct scmi_protocol_handle *ph,
-				     u32 clk_id, u8 oem_type, u32 *oem_val,
-				     u32 *attributes, bool atomic)
+				     u32 clk_id,
+				     enum scmi_clock_oem_config oem_type,
+				     u32 *oem_val, u32 *attributes, bool atomic)
 {
 	struct clock_info *ci = ph->get_priv(ph);
+	struct scmi_clock_info *clk;
+
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	if (!clk->extended_config)
+		return -EOPNOTSUPP;
 
 	return ci->clock_config_get(ph, clk_id, oem_type, attributes,
 				    NULL, oem_val, atomic);
@@ -800,10 +915,10 @@ scmi_clock_info_get(const struct scmi_protocol_handle *ph, u32 clk_id)
 	struct scmi_clock_info *clk;
 	struct clock_info *ci = ph->get_priv(ph);
 
-	if (clk_id >= ci->num_clocks)
+	clk = scmi_clock_domain_lookup(ci, clk_id);
+	if (IS_ERR(clk))
 		return NULL;
 
-	clk = ci->clk + clk_id;
 	if (!clk->name[0])
 		return NULL;
 
@@ -824,6 +939,28 @@ static const struct scmi_clk_proto_ops clk_proto_ops = {
 	.parent_get = scmi_clock_get_parent,
 };
 
+static bool scmi_clk_notify_supported(const struct scmi_protocol_handle *ph,
+				      u8 evt_id, u32 src_id)
+{
+	bool supported;
+	struct scmi_clock_info *clk;
+	struct clock_info *ci = ph->get_priv(ph);
+
+	if (evt_id >= ARRAY_SIZE(evt_2_cmd))
+		return false;
+
+	clk = scmi_clock_domain_lookup(ci, src_id);
+	if (IS_ERR(clk))
+		return false;
+
+	if (evt_id == SCMI_EVENT_CLOCK_RATE_CHANGED)
+		supported = clk->rate_changed_notifications;
+	else
+		supported = clk->rate_change_requested_notifications;
+
+	return supported;
+}
+
 static int scmi_clk_rate_notify(const struct scmi_protocol_handle *ph,
 				u32 clk_id, int message_id, bool enable)
 {
@@ -908,6 +1045,7 @@ static const struct scmi_event clk_events[] = {
 };
 
 static const struct scmi_event_ops clk_event_ops = {
+	.is_notify_supported = scmi_clk_notify_supported,
 	.get_num_sources = scmi_clk_get_num_sources,
 	.set_notify_enabled = scmi_clk_set_notify_enabled,
 	.fill_custom_report = scmi_clk_fill_custom_report,
@@ -949,7 +1087,7 @@ static int scmi_clock_protocol_init(const struct scmi_protocol_handle *ph)
 	for (clkid = 0; clkid < cinfo->num_clocks; clkid++) {
 		struct scmi_clock_info *clk = cinfo->clk + clkid;
 
-		ret = scmi_clock_attributes_get(ph, clkid, clk, version);
+		ret = scmi_clock_attributes_get(ph, clkid, cinfo, version);
 		if (!ret)
 			scmi_clock_describe_rates_get(ph, clkid, clk);
 	}
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 00b165d1f502..6affbfdd1dec 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -141,7 +141,7 @@ scmi_revision_area_get(const struct scmi_protocol_handle *ph);
 void scmi_setup_protocol_implemented(const struct scmi_protocol_handle *ph,
 				     u8 *prot_imp);
 
-extern struct bus_type scmi_bus_type;
+extern const struct bus_type scmi_bus_type;
 
 #define SCMI_BUS_NOTIFY_DEVICE_REQUEST		0
 #define SCMI_BUS_NOTIFY_DEVICE_UNREQUEST	1
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 3ea64b22cf0d..34d77802c990 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -86,6 +86,12 @@ struct scmi_xfers_info {
  * @users: A refcount to track effective users of this protocol.
  * @priv: Reference for optional protocol private data.
  * @version: Protocol version supported by the platform as detected at runtime.
+ * @negotiated_version: When the platform supports a newer protocol version,
+ *			the agent will try to negotiate with the platform the
+ *			usage of the newest version known to it, since
+ *			backward compatibility is NOT automatically assured.
+ *			This field is NON-zero when a successful negotiation
+ *			has completed.
  * @ph: An embedded protocol handle that will be passed down to protocol
  *	initialization code to identify this instance.
  *
@@ -99,6 +105,7 @@ struct scmi_protocol_instance {
 	refcount_t			users;
 	void				*priv;
 	unsigned int			version;
+	unsigned int			negotiated_version;
 	struct scmi_protocol_handle	ph;
 };
 
@@ -1754,10 +1761,44 @@ static void scmi_common_fastchannel_db_ring(struct scmi_fc_db_info *db)
 #endif
 }
 
+/**
+ * scmi_protocol_msg_check  - Check protocol message attributes
+ *
+ * @ph: A reference to the protocol handle.
+ * @message_id: The ID of the message to check.
+ * @attributes: A parameter to optionally return the retrieved message
+ *		attributes, in case of Success.
+ *
+ * An helper to check protocol message attributes for a specific protocol
+ * and message pair.
+ *
+ * Return: 0 on SUCCESS
+ */
+static int scmi_protocol_msg_check(const struct scmi_protocol_handle *ph,
+				   u32 message_id, u32 *attributes)
+{
+	int ret;
+	struct scmi_xfer *t;
+
+	ret = xfer_get_init(ph, PROTOCOL_MESSAGE_ATTRIBUTES,
+			    sizeof(__le32), 0, &t);
+	if (ret)
+		return ret;
+
+	put_unaligned_le32(message_id, t->tx.buf);
+	ret = do_xfer(ph, t);
+	if (!ret && attributes)
+		*attributes = get_unaligned_le32(t->rx.buf);
+	xfer_put(ph, t);
+
+	return ret;
+}
+
 static const struct scmi_proto_helpers_ops helpers_ops = {
 	.extended_name_get = scmi_common_extended_name_get,
 	.iter_response_init = scmi_iterator_init,
 	.iter_response_run = scmi_iterator_run,
+	.protocol_msg_check = scmi_protocol_msg_check,
 	.fastchannel_init = scmi_common_fastchannel_init,
 	.fastchannel_db_ring = scmi_common_fastchannel_db_ring,
 };
@@ -1782,6 +1823,44 @@ scmi_revision_area_get(const struct scmi_protocol_handle *ph)
 }
 
 /**
+ * scmi_protocol_version_negotiate  - Negotiate protocol version
+ *
+ * @ph: A reference to the protocol handle.
+ *
+ * An helper to negotiate a protocol version different from the latest
+ * advertised as supported from the platform: on Success backward
+ * compatibility is assured by the platform.
+ *
+ * Return: 0 on Success
+ */
+static int scmi_protocol_version_negotiate(struct scmi_protocol_handle *ph)
+{
+	int ret;
+	struct scmi_xfer *t;
+	struct scmi_protocol_instance *pi = ph_to_pi(ph);
+
+	/* At first check if NEGOTIATE_PROTOCOL_VERSION is supported ... */
+	ret = scmi_protocol_msg_check(ph, NEGOTIATE_PROTOCOL_VERSION, NULL);
+	if (ret)
+		return ret;
+
+	/* ... then attempt protocol version negotiation */
+	ret = xfer_get_init(ph, NEGOTIATE_PROTOCOL_VERSION,
+			    sizeof(__le32), 0, &t);
+	if (ret)
+		return ret;
+
+	put_unaligned_le32(pi->proto->supported_version, t->tx.buf);
+	ret = do_xfer(ph, t);
+	if (!ret)
+		pi->negotiated_version = pi->proto->supported_version;
+
+	xfer_put(ph, t);
+
+	return ret;
+}
+
+/**
  * scmi_alloc_init_protocol_instance  - Allocate and initialize a protocol
  * instance descriptor.
  * @info: The reference to the related SCMI instance.
@@ -1853,11 +1932,21 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info,
 	devres_close_group(handle->dev, pi->gid);
 	dev_dbg(handle->dev, "Initialized protocol: 0x%X\n", pi->proto->id);
 
-	if (pi->version > proto->supported_version)
-		dev_warn(handle->dev,
-			 "Detected UNSUPPORTED higher version 0x%X for protocol 0x%X."
-			 "Backward compatibility is NOT assured.\n",
-			 pi->version, pi->proto->id);
+	if (pi->version > proto->supported_version) {
+		ret = scmi_protocol_version_negotiate(&pi->ph);
+		if (!ret) {
+			dev_info(handle->dev,
+				 "Protocol 0x%X successfully negotiated version 0x%X\n",
+				 proto->id, pi->negotiated_version);
+		} else {
+			dev_warn(handle->dev,
+				 "Detected UNSUPPORTED higher version 0x%X for protocol 0x%X.\n",
+				 pi->version, pi->proto->id);
+			dev_warn(handle->dev,
+				 "Trying version 0x%X. Backward compatibility is NOT assured.\n",
+				 pi->proto->supported_version);
+		}
+	}
 
 	return pi;
 
diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c
index 0efd20cd9d69..27c52531194d 100644
--- a/drivers/firmware/arm_scmi/notify.c
+++ b/drivers/firmware/arm_scmi/notify.c
@@ -99,6 +99,7 @@
 #define PROTO_ID_MASK		GENMASK(31, 24)
 #define EVT_ID_MASK		GENMASK(23, 16)
 #define SRC_ID_MASK		GENMASK(15, 0)
+#define NOTIF_UNSUPP		-1
 
 /*
  * Builds an unsigned 32bit key from the given input tuple to be used
@@ -788,6 +789,7 @@ int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
 
 	pd->ph = ph;
 	for (i = 0; i < ee->num_events; i++, evt++) {
+		int id;
 		struct scmi_registered_event *r_evt;
 
 		r_evt = devm_kzalloc(ni->handle->dev, sizeof(*r_evt),
@@ -809,6 +811,11 @@ int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
 		if (!r_evt->report)
 			return -ENOMEM;
 
+		for (id = 0; id < r_evt->num_sources; id++)
+			if (ee->ops->is_notify_supported &&
+			    !ee->ops->is_notify_supported(ph, r_evt->evt->id, id))
+				refcount_set(&r_evt->sources[id], NOTIF_UNSUPP);
+
 		pd->registered_events[i] = r_evt;
 		/* Ensure events are updated */
 		smp_wmb();
@@ -1166,7 +1173,13 @@ static inline int __scmi_enable_evt(struct scmi_registered_event *r_evt,
 			int ret = 0;
 
 			sid = &r_evt->sources[src_id];
-			if (refcount_read(sid) == 0) {
+			if (refcount_read(sid) == NOTIF_UNSUPP) {
+				dev_dbg(r_evt->proto->ph->dev,
+					"Notification NOT supported - proto_id:%d  evt_id:%d  src_id:%d",
+					r_evt->proto->id, r_evt->evt->id,
+					src_id);
+				ret = -EOPNOTSUPP;
+			} else if (refcount_read(sid) == 0) {
 				ret = REVT_NOTIFY_ENABLE(r_evt, r_evt->evt->id,
 							 src_id);
 				if (!ret)
@@ -1179,6 +1192,8 @@ static inline int __scmi_enable_evt(struct scmi_registered_event *r_evt,
 	} else {
 		for (; num_sources; src_id++, num_sources--) {
 			sid = &r_evt->sources[src_id];
+			if (refcount_read(sid) == NOTIF_UNSUPP)
+				continue;
 			if (refcount_dec_and_test(sid))
 				REVT_NOTIFY_DISABLE(r_evt,
 						    r_evt->evt->id, src_id);
diff --git a/drivers/firmware/arm_scmi/notify.h b/drivers/firmware/arm_scmi/notify.h
index 4e9b627edfef..76758a736cf4 100644
--- a/drivers/firmware/arm_scmi/notify.h
+++ b/drivers/firmware/arm_scmi/notify.h
@@ -35,6 +35,8 @@ struct scmi_protocol_handle;
 
 /**
  * struct scmi_event_ops  - Protocol helpers called by the notification core.
+ * @is_notify_supported: Return 0 if the specified notification for the
+ *			 specified resource (src_id) is supported.
  * @get_num_sources: Returns the number of possible events' sources for this
  *		     protocol
  * @set_notify_enabled: Enable/disable the required evt_id/src_id notifications
@@ -50,6 +52,8 @@ struct scmi_protocol_handle;
  *	    process context.
  */
 struct scmi_event_ops {
+	bool (*is_notify_supported)(const struct scmi_protocol_handle *ph,
+				    u8 evt_id, u32 src_id);
 	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);
diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index 25bfb465484d..4e7944b91e38 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -109,8 +109,10 @@ enum scmi_optee_pta_cmd {
  * @rx_len: Response size
  * @mu: Mutex protection on channel access
  * @cinfo: SCMI channel information
- * @shmem: Virtual base address of the shared memory
- * @req: Shared memory protocol handle for SCMI request and synchronous response
+ * @req: union for SCMI interface
+ * @req.shmem: Virtual base address of the shared memory
+ * @req.msg: Shared memory protocol handle for SCMI request and
+ *   synchronous response
  * @tee_shm: TEE shared memory handle @req or NULL if using IOMEM shmem
  * @link: Reference in agent's channel list
  */
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 211e8e0aef2c..981e327e63e3 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -182,6 +182,8 @@ struct scmi_perf_info {
 	enum scmi_power_scale power_scale;
 	u64 stats_addr;
 	u32 stats_size;
+	bool notify_lvl_cmd;
+	bool notify_lim_cmd;
 	struct perf_dom_info *dom_info;
 };
 
@@ -222,6 +224,15 @@ static int scmi_perf_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret) {
+		if (!ph->hops->protocol_msg_check(ph, PERF_NOTIFY_LEVEL, NULL))
+			pi->notify_lvl_cmd = true;
+
+		if (!ph->hops->protocol_msg_check(ph, PERF_NOTIFY_LIMITS, NULL))
+			pi->notify_lim_cmd = true;
+	}
+
 	return ret;
 }
 
@@ -239,6 +250,7 @@ static void scmi_perf_xa_destroy(void *data)
 static int
 scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 				struct perf_dom_info *dom_info,
+				bool notify_lim_cmd, bool notify_lvl_cmd,
 				u32 version)
 {
 	int ret;
@@ -260,8 +272,12 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 
 		dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
 		dom_info->info.set_perf = SUPPORTS_SET_PERF_LVL(flags);
-		dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
-		dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
+		if (notify_lim_cmd)
+			dom_info->perf_limit_notify =
+				SUPPORTS_PERF_LIMIT_NOTIFY(flags);
+		if (notify_lvl_cmd)
+			dom_info->perf_level_notify =
+				SUPPORTS_PERF_LEVEL_NOTIFY(flags);
 		dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
 		if (PROTOCOL_REV_MAJOR(version) >= 0x4)
 			dom_info->level_indexing_mode =
@@ -270,15 +286,30 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 					le32_to_cpu(attr->sustained_freq_khz);
 		dom_info->sustained_perf_level =
 					le32_to_cpu(attr->sustained_perf_level);
+		/*
+		 * sustained_freq_khz = mult_factor * sustained_perf_level
+		 * mult_factor must be non zero positive integer(not fraction)
+		 */
 		if (!dom_info->sustained_freq_khz ||
 		    !dom_info->sustained_perf_level ||
-		    dom_info->level_indexing_mode)
+		    dom_info->level_indexing_mode) {
 			/* CPUFreq converts to kHz, hence default 1000 */
 			dom_info->mult_factor =	1000;
-		else
+		} else {
 			dom_info->mult_factor =
 					(dom_info->sustained_freq_khz * 1000UL)
 					/ dom_info->sustained_perf_level;
+			if ((dom_info->sustained_freq_khz * 1000UL) %
+			    dom_info->sustained_perf_level)
+				dev_warn(ph->dev,
+					 "multiplier for domain %d rounded\n",
+					 dom_info->id);
+		}
+		if (!dom_info->mult_factor)
+			dev_warn(ph->dev,
+			         "Wrong sustained perf/frequency(domain %d)\n",
+				 dom_info->id);
+
 		strscpy(dom_info->info.name, attr->name,
 			SCMI_SHORT_NAME_MAX_SIZE);
 	}
@@ -295,9 +326,9 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 					    dom_info->id, NULL, dom_info->info.name,
 					    SCMI_MAX_STR_SIZE);
 
+	xa_init(&dom_info->opps_by_lvl);
 	if (dom_info->level_indexing_mode) {
 		xa_init(&dom_info->opps_by_idx);
-		xa_init(&dom_info->opps_by_lvl);
 		hash_init(dom_info->opps_by_freq);
 	}
 
@@ -340,13 +371,21 @@ static int iter_perf_levels_update_state(struct scmi_iterator_state *st,
 }
 
 static inline void
-process_response_opp(struct scmi_opp *opp, unsigned int loop_idx,
+process_response_opp(struct device *dev, struct perf_dom_info *dom,
+		     struct scmi_opp *opp, unsigned int loop_idx,
 		     const struct scmi_msg_resp_perf_describe_levels *r)
 {
+	int ret;
+
 	opp->perf = le32_to_cpu(r->opp[loop_idx].perf_val);
 	opp->power = le32_to_cpu(r->opp[loop_idx].power);
 	opp->trans_latency_us =
 		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
+
+	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
+	if (ret)
+		dev_warn(dev, "Failed to add opps_by_lvl at %d - ret:%d\n",
+			 opp->perf, ret);
 }
 
 static inline void
@@ -354,16 +393,21 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom,
 			struct scmi_opp *opp, unsigned int loop_idx,
 			const struct scmi_msg_resp_perf_describe_levels_v4 *r)
 {
+	int ret;
+
 	opp->perf = le32_to_cpu(r->opp[loop_idx].perf_val);
 	opp->power = le32_to_cpu(r->opp[loop_idx].power);
 	opp->trans_latency_us =
 		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
 
+	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
+	if (ret)
+		dev_warn(dev, "Failed to add opps_by_lvl at %d - ret:%d\n",
+			 opp->perf, ret);
+
 	/* Note that PERF v4 reports always five 32-bit words */
 	opp->indicative_freq = le32_to_cpu(r->opp[loop_idx].indicative_freq);
 	if (dom->level_indexing_mode) {
-		int ret;
-
 		opp->level_index = le32_to_cpu(r->opp[loop_idx].level_index);
 
 		ret = xa_insert(&dom->opps_by_idx, opp->level_index, opp,
@@ -373,12 +417,6 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom,
 				 "Failed to add opps_by_idx at %d - ret:%d\n",
 				 opp->level_index, ret);
 
-		ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
-		if (ret)
-			dev_warn(dev,
-				 "Failed to add opps_by_lvl at %d - ret:%d\n",
-				 opp->perf, ret);
-
 		hash_add(dom->opps_by_freq, &opp->hash, opp->indicative_freq);
 	}
 }
@@ -393,7 +431,8 @@ iter_perf_levels_process_response(const struct scmi_protocol_handle *ph,
 
 	opp = &p->perf_dom->opp[st->desc_index + st->loop_idx];
 	if (PROTOCOL_REV_MAJOR(p->version) <= 0x3)
-		process_response_opp(opp, st->loop_idx, response);
+		process_response_opp(ph->dev, p->perf_dom, opp, st->loop_idx,
+				     response);
 	else
 		process_response_opp_v4(ph->dev, p->perf_dom, opp, st->loop_idx,
 					response);
@@ -978,6 +1017,27 @@ static const struct scmi_perf_proto_ops perf_proto_ops = {
 	.power_scale_get = scmi_power_scale_get,
 };
 
+static bool scmi_perf_notify_supported(const struct scmi_protocol_handle *ph,
+				       u8 evt_id, u32 src_id)
+{
+	bool supported;
+	struct perf_dom_info *dom;
+
+	if (evt_id >= ARRAY_SIZE(evt_2_cmd))
+		return false;
+
+	dom = scmi_perf_domain_lookup(ph, src_id);
+	if (IS_ERR(dom))
+		return false;
+
+	if (evt_id == SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED)
+		supported = dom->perf_limit_notify;
+	else
+		supported = dom->perf_level_notify;
+
+	return supported;
+}
+
 static int scmi_perf_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					u8 evt_id, u32 src_id, bool enable)
 {
@@ -995,18 +1055,47 @@ static int scmi_perf_set_notify_enabled(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
+static int
+scmi_perf_xlate_opp_to_freq(struct perf_dom_info *dom,
+			    unsigned int index, unsigned long *freq)
+{
+	struct scmi_opp *opp;
+
+	if (!dom || !freq)
+		return -EINVAL;
+
+	if (!dom->level_indexing_mode) {
+		opp = xa_load(&dom->opps_by_lvl, index);
+		if (!opp)
+			return -ENODEV;
+
+		*freq = opp->perf * dom->mult_factor;
+	} else {
+		opp = xa_load(&dom->opps_by_idx, index);
+		if (!opp)
+			return -ENODEV;
+
+		*freq = opp->indicative_freq * dom->mult_factor;
+	}
+
+	return 0;
+}
+
 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)
 {
+	int ret;
 	void *rep = NULL;
+	struct perf_dom_info *dom;
 
 	switch (evt_id) {
 	case SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED:
 	{
 		const struct scmi_perf_limits_notify_payld *p = payld;
 		struct scmi_perf_limits_report *r = report;
+		unsigned long freq_min, freq_max;
 
 		if (sizeof(*p) != payld_sz)
 			break;
@@ -1016,14 +1105,36 @@ static void *scmi_perf_fill_custom_report(const struct scmi_protocol_handle *ph,
 		r->domain_id = le32_to_cpu(p->domain_id);
 		r->range_max = le32_to_cpu(p->range_max);
 		r->range_min = le32_to_cpu(p->range_min);
+		/* Check if the reported domain exist at all */
+		dom = scmi_perf_domain_lookup(ph, r->domain_id);
+		if (IS_ERR(dom))
+			break;
+		/*
+		 * Event will be reported from this point on...
+		 * ...even if, later, xlated frequencies were not retrieved.
+		 */
 		*src_id = r->domain_id;
 		rep = r;
+
+		ret = scmi_perf_xlate_opp_to_freq(dom, r->range_max, &freq_max);
+		if (ret)
+			break;
+
+		ret = scmi_perf_xlate_opp_to_freq(dom, r->range_min, &freq_min);
+		if (ret)
+			break;
+
+		/* Report translated freqs ONLY if both available */
+		r->range_max_freq = freq_max;
+		r->range_min_freq = freq_min;
+
 		break;
 	}
 	case SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED:
 	{
 		const struct scmi_perf_level_notify_payld *p = payld;
 		struct scmi_perf_level_report *r = report;
+		unsigned long freq;
 
 		if (sizeof(*p) != payld_sz)
 			break;
@@ -1031,9 +1142,27 @@ static void *scmi_perf_fill_custom_report(const struct scmi_protocol_handle *ph,
 		r->timestamp = timestamp;
 		r->agent_id = le32_to_cpu(p->agent_id);
 		r->domain_id = le32_to_cpu(p->domain_id);
+		/* Report translated freqs ONLY if available */
 		r->performance_level = le32_to_cpu(p->performance_level);
+		/* Check if the reported domain exist at all */
+		dom = scmi_perf_domain_lookup(ph, r->domain_id);
+		if (IS_ERR(dom))
+			break;
+		/*
+		 * Event will be reported from this point on...
+		 * ...even if, later, xlated frequencies were not retrieved.
+		 */
 		*src_id = r->domain_id;
 		rep = r;
+
+		/* Report translated freqs ONLY if available */
+		ret = scmi_perf_xlate_opp_to_freq(dom, r->performance_level,
+						  &freq);
+		if (ret)
+			break;
+
+		r->performance_level_freq = freq;
+
 		break;
 	}
 	default:
@@ -1067,6 +1196,7 @@ static const struct scmi_event perf_events[] = {
 };
 
 static const struct scmi_event_ops perf_event_ops = {
+	.is_notify_supported = scmi_perf_notify_supported,
 	.get_num_sources = scmi_perf_get_num_sources,
 	.set_notify_enabled = scmi_perf_set_notify_enabled,
 	.fill_custom_report = scmi_perf_fill_custom_report,
@@ -1111,7 +1241,8 @@ static int scmi_perf_protocol_init(const struct scmi_protocol_handle *ph)
 		struct perf_dom_info *dom = pinfo->dom_info + domain;
 
 		dom->id = domain;
-		scmi_perf_domain_attributes_get(ph, dom, version);
+		scmi_perf_domain_attributes_get(ph, dom, pinfo->notify_lim_cmd,
+						pinfo->notify_lvl_cmd, version);
 		scmi_perf_describe_levels_get(ph, dom, version);
 
 		if (dom->perf_fastchannels)
diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
index c2e6b9b4d941..49666bd1d8ac 100644
--- a/drivers/firmware/arm_scmi/power.c
+++ b/drivers/firmware/arm_scmi/power.c
@@ -68,6 +68,7 @@ struct power_dom_info {
 
 struct scmi_power_info {
 	u32 version;
+	bool notify_state_change_cmd;
 	int num_domains;
 	u64 stats_addr;
 	u32 stats_size;
@@ -97,13 +98,18 @@ static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret)
+		if (!ph->hops->protocol_msg_check(ph, POWER_STATE_NOTIFY, NULL))
+			pi->notify_state_change_cmd = true;
+
 	return ret;
 }
 
 static int
 scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
 				 u32 domain, struct power_dom_info *dom_info,
-				 u32 version)
+				 u32 version, bool notify_state_change_cmd)
 {
 	int ret;
 	u32 flags;
@@ -122,7 +128,9 @@ scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
 	if (!ret) {
 		flags = le32_to_cpu(attr->flags);
 
-		dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
+		if (notify_state_change_cmd)
+			dom_info->state_set_notify =
+				SUPPORTS_STATE_SET_NOTIFY(flags);
 		dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
 		dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
 		strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
@@ -231,6 +239,20 @@ static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
+static bool scmi_power_notify_supported(const struct scmi_protocol_handle *ph,
+					u8 evt_id, u32 src_id)
+{
+	struct power_dom_info *dom;
+	struct scmi_power_info *pinfo = ph->get_priv(ph);
+
+	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED ||
+	    src_id >= pinfo->num_domains)
+		return false;
+
+	dom = pinfo->dom_info + src_id;
+	return dom->state_set_notify;
+}
+
 static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					 u8 evt_id, u32 src_id, bool enable)
 {
@@ -285,6 +307,7 @@ static const struct scmi_event power_events[] = {
 };
 
 static const struct scmi_event_ops power_event_ops = {
+	.is_notify_supported = scmi_power_notify_supported,
 	.get_num_sources = scmi_power_get_num_sources,
 	.set_notify_enabled = scmi_power_set_notify_enabled,
 	.fill_custom_report = scmi_power_fill_custom_report,
@@ -326,7 +349,8 @@ static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct power_dom_info *dom = pinfo->dom_info + domain;
 
-		scmi_power_domain_attributes_get(ph, domain, dom, version);
+		scmi_power_domain_attributes_get(ph, domain, dom, version,
+						 pinfo->notify_state_change_cmd);
 	}
 
 	pinfo->version = version;
diff --git a/drivers/firmware/arm_scmi/powercap.c b/drivers/firmware/arm_scmi/powercap.c
index a4c6cd4716fe..2fab92367e42 100644
--- a/drivers/firmware/arm_scmi/powercap.c
+++ b/drivers/firmware/arm_scmi/powercap.c
@@ -124,6 +124,8 @@ struct scmi_powercap_state {
 struct powercap_info {
 	u32 version;
 	int num_domains;
+	bool notify_cap_cmd;
+	bool notify_measurements_cmd;
 	struct scmi_powercap_state *states;
 	struct scmi_powercap_info *powercaps;
 };
@@ -157,6 +159,18 @@ scmi_powercap_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret) {
+		if (!ph->hops->protocol_msg_check(ph,
+						  POWERCAP_CAP_NOTIFY, NULL))
+			pi->notify_cap_cmd = true;
+
+		if (!ph->hops->protocol_msg_check(ph,
+						  POWERCAP_MEASUREMENTS_NOTIFY,
+						  NULL))
+			pi->notify_measurements_cmd = true;
+	}
+
 	return ret;
 }
 
@@ -200,10 +214,12 @@ scmi_powercap_domain_attributes_get(const struct scmi_protocol_handle *ph,
 		flags = le32_to_cpu(resp->attributes);
 
 		dom_info->id = domain;
-		dom_info->notify_powercap_cap_change =
-			SUPPORTS_POWERCAP_CAP_CHANGE_NOTIFY(flags);
-		dom_info->notify_powercap_measurement_change =
-			SUPPORTS_POWERCAP_MEASUREMENTS_CHANGE_NOTIFY(flags);
+		if (pinfo->notify_cap_cmd)
+			dom_info->notify_powercap_cap_change =
+				SUPPORTS_POWERCAP_CAP_CHANGE_NOTIFY(flags);
+		if (pinfo->notify_measurements_cmd)
+			dom_info->notify_powercap_measurement_change =
+				SUPPORTS_POWERCAP_MEASUREMENTS_CHANGE_NOTIFY(flags);
 		dom_info->async_powercap_cap_set =
 			SUPPORTS_ASYNC_POWERCAP_CAP_SET(flags);
 		dom_info->powercap_cap_config =
@@ -788,6 +804,26 @@ static int scmi_powercap_notify(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
+static bool
+scmi_powercap_notify_supported(const struct scmi_protocol_handle *ph,
+			       u8 evt_id, u32 src_id)
+{
+	bool supported = false;
+	const struct scmi_powercap_info *dom_info;
+	struct powercap_info *pi = ph->get_priv(ph);
+
+	if (evt_id >= ARRAY_SIZE(evt_2_cmd) || src_id >= pi->num_domains)
+		return false;
+
+	dom_info = pi->powercaps + src_id;
+	if (evt_id == SCMI_EVENT_POWERCAP_CAP_CHANGED)
+		supported = dom_info->notify_powercap_cap_change;
+	else if (evt_id == SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED)
+		supported = dom_info->notify_powercap_measurement_change;
+
+	return supported;
+}
+
 static int
 scmi_powercap_set_notify_enabled(const struct scmi_protocol_handle *ph,
 				 u8 evt_id, u32 src_id, bool enable)
@@ -904,6 +940,7 @@ static const struct scmi_event powercap_events[] = {
 };
 
 static const struct scmi_event_ops powercap_event_ops = {
+	.is_notify_supported = scmi_powercap_notify_supported,
 	.get_num_sources = scmi_powercap_get_num_sources,
 	.set_notify_enabled = scmi_powercap_set_notify_enabled,
 	.fill_custom_report = scmi_powercap_fill_custom_report,
diff --git a/drivers/firmware/arm_scmi/protocols.h b/drivers/firmware/arm_scmi/protocols.h
index e683c26f24eb..693019fff0f6 100644
--- a/drivers/firmware/arm_scmi/protocols.h
+++ b/drivers/firmware/arm_scmi/protocols.h
@@ -33,6 +33,7 @@ enum scmi_common_cmd {
 	PROTOCOL_VERSION = 0x0,
 	PROTOCOL_ATTRIBUTES = 0x1,
 	PROTOCOL_MESSAGE_ATTRIBUTES = 0x2,
+	NEGOTIATE_PROTOCOL_VERSION = 0x10,
 };
 
 /**
@@ -251,6 +252,8 @@ struct scmi_fc_info {
  *			provided in @ops.
  * @iter_response_run: A common helper to trigger the run of a previously
  *		       initialized iterator.
+ * @protocol_msg_check: A common helper to check is a specific protocol message
+ *			is supported.
  * @fastchannel_init: A common helper used to initialize FC descriptors by
  *		      gathering FC descriptions from the SCMI platform server.
  * @fastchannel_db_ring: A common helper to ring a FC doorbell.
@@ -264,6 +267,8 @@ struct scmi_proto_helpers_ops {
 				    unsigned int max_resources, u8 msg_id,
 				    size_t tx_size, void *priv);
 	int (*iter_response_run)(void *iter);
+	int (*protocol_msg_check)(const struct scmi_protocol_handle *ph,
+				  u32 message_id, u32 *attributes);
 	void (*fastchannel_init)(const struct scmi_protocol_handle *ph,
 				 u8 describe_id, u32 message_id,
 				 u32 valid_size, u32 domain,
diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
index 19970d9f9e36..1b318316535e 100644
--- a/drivers/firmware/arm_scmi/reset.c
+++ b/drivers/firmware/arm_scmi/reset.c
@@ -67,6 +67,7 @@ struct reset_dom_info {
 struct scmi_reset_info {
 	u32 version;
 	int num_domains;
+	bool notify_reset_cmd;
 	struct reset_dom_info *dom_info;
 };
 
@@ -89,18 +90,24 @@ static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret)
+		if (!ph->hops->protocol_msg_check(ph, RESET_NOTIFY, NULL))
+			pi->notify_reset_cmd = true;
+
 	return ret;
 }
 
 static int
 scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
-				 u32 domain, struct reset_dom_info *dom_info,
-				 u32 version)
+				 struct scmi_reset_info *pinfo,
+				 u32 domain, u32 version)
 {
 	int ret;
 	u32 attributes;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_reset_domain_attributes *attr;
+	struct reset_dom_info *dom_info = pinfo->dom_info + domain;
 
 	ret = ph->xops->xfer_get_init(ph, RESET_DOMAIN_ATTRIBUTES,
 				      sizeof(domain), sizeof(*attr), &t);
@@ -115,7 +122,9 @@ scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
 		attributes = le32_to_cpu(attr->attributes);
 
 		dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
-		dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
+		if (pinfo->notify_reset_cmd)
+			dom_info->reset_notify =
+				SUPPORTS_NOTIFY_RESET(attributes);
 		dom_info->latency_us = le32_to_cpu(attr->latency);
 		if (dom_info->latency_us == U32_MAX)
 			dom_info->latency_us = 0;
@@ -226,6 +235,20 @@ static const struct scmi_reset_proto_ops reset_proto_ops = {
 	.deassert = scmi_reset_domain_deassert,
 };
 
+static bool scmi_reset_notify_supported(const struct scmi_protocol_handle *ph,
+					u8 evt_id, u32 src_id)
+{
+	struct reset_dom_info *dom;
+	struct scmi_reset_info *pi = ph->get_priv(ph);
+
+	if (evt_id != SCMI_EVENT_RESET_ISSUED || src_id >= pi->num_domains)
+		return false;
+
+	dom = pi->dom_info + src_id;
+
+	return dom->reset_notify;
+}
+
 static int scmi_reset_notify(const struct scmi_protocol_handle *ph,
 			     u32 domain_id, bool enable)
 {
@@ -301,6 +324,7 @@ static const struct scmi_event reset_events[] = {
 };
 
 static const struct scmi_event_ops reset_event_ops = {
+	.is_notify_supported = scmi_reset_notify_supported,
 	.get_num_sources = scmi_reset_get_num_sources,
 	.set_notify_enabled = scmi_reset_set_notify_enabled,
 	.fill_custom_report = scmi_reset_fill_custom_report,
@@ -339,11 +363,8 @@ static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
 	if (!pinfo->dom_info)
 		return -ENOMEM;
 
-	for (domain = 0; domain < pinfo->num_domains; domain++) {
-		struct reset_dom_info *dom = pinfo->dom_info + domain;
-
-		scmi_reset_domain_attributes_get(ph, domain, dom, version);
-	}
+	for (domain = 0; domain < pinfo->num_domains; domain++)
+		scmi_reset_domain_attributes_get(ph, pinfo, domain, version);
 
 	pinfo->version = version;
 	return ph->set_priv(ph, pinfo, version);
diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index 311149965370..7fc5535ca34c 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -215,6 +215,8 @@ struct scmi_sensor_update_notify_payld {
 
 struct sensors_info {
 	u32 version;
+	bool notify_trip_point_cmd;
+	bool notify_continuos_update_cmd;
 	int num_sensors;
 	int max_requests;
 	u64 reg_addr;
@@ -246,6 +248,18 @@ static int scmi_sensor_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	if (!ret) {
+		if (!ph->hops->protocol_msg_check(ph,
+						  SENSOR_TRIP_POINT_NOTIFY, NULL))
+			si->notify_trip_point_cmd = true;
+
+		if (!ph->hops->protocol_msg_check(ph,
+						  SENSOR_CONTINUOUS_UPDATE_NOTIFY,
+						  NULL))
+			si->notify_continuos_update_cmd = true;
+	}
+
 	return ret;
 }
 
@@ -594,7 +608,8 @@ iter_sens_descr_process_response(const struct scmi_protocol_handle *ph,
 	 * Such bitfields are assumed to be zeroed on non
 	 * relevant fw versions...assuming fw not buggy !
 	 */
-	s->update = SUPPORTS_UPDATE_NOTIFY(attrl);
+	if (si->notify_continuos_update_cmd)
+		s->update = SUPPORTS_UPDATE_NOTIFY(attrl);
 	s->timestamped = SUPPORTS_TIMESTAMP(attrl);
 	if (s->timestamped)
 		s->tstamp_scale = S32_EXT(SENSOR_TSTAMP_EXP(attrl));
@@ -988,6 +1003,25 @@ static const struct scmi_sensor_proto_ops sensor_proto_ops = {
 	.config_set = scmi_sensor_config_set,
 };
 
+static bool scmi_sensor_notify_supported(const struct scmi_protocol_handle *ph,
+					 u8 evt_id, u32 src_id)
+{
+	bool supported = false;
+	const struct scmi_sensor_info *s;
+	struct sensors_info *sinfo = ph->get_priv(ph);
+
+	s = scmi_sensor_info_get(ph, src_id);
+	if (!s)
+		return false;
+
+	if (evt_id == SCMI_EVENT_SENSOR_TRIP_POINT_EVENT)
+		supported = sinfo->notify_trip_point_cmd;
+	else if (evt_id == SCMI_EVENT_SENSOR_UPDATE)
+		supported = s->update;
+
+	return supported;
+}
+
 static int scmi_sensor_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					  u8 evt_id, u32 src_id, bool enable)
 {
@@ -1099,6 +1133,7 @@ static const struct scmi_event sensor_events[] = {
 };
 
 static const struct scmi_event_ops sensor_event_ops = {
+	.is_notify_supported = scmi_sensor_notify_supported,
 	.get_num_sources = scmi_sensor_get_num_sources,
 	.set_notify_enabled = scmi_sensor_set_notify_enabled,
 	.fill_custom_report = scmi_sensor_fill_custom_report,
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index 7611e9665038..39936e1dd30e 100644
--- a/drivers/firmware/arm_scmi/smc.c
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -214,6 +214,13 @@ static int smc_chan_free(int id, void *p, void *data)
 	struct scmi_chan_info *cinfo = p;
 	struct scmi_smc *scmi_info = cinfo->transport_info;
 
+	/*
+	 * Different protocols might share the same chan info, so a previous
+	 * smc_chan_free call might have already freed the structure.
+	 */
+	if (!scmi_info)
+		return 0;
+
 	/* Ignore any possible further reception on the IRQ path */
 	if (scmi_info->irq > 0)
 		free_irq(scmi_info->irq, scmi_info);
diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c
index 1621da97bcbb..b6358c155f7f 100644
--- a/drivers/firmware/arm_scmi/system.c
+++ b/drivers/firmware/arm_scmi/system.c
@@ -36,8 +36,20 @@ struct scmi_system_power_state_notifier_payld {
 struct scmi_system_info {
 	u32 version;
 	bool graceful_timeout_supported;
+	bool power_state_notify_cmd;
 };
 
+static bool scmi_system_notify_supported(const struct scmi_protocol_handle *ph,
+					 u8 evt_id, u32 src_id)
+{
+	struct scmi_system_info *pinfo = ph->get_priv(ph);
+
+	if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER)
+		return false;
+
+	return pinfo->power_state_notify_cmd;
+}
+
 static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
 				      bool enable)
 {
@@ -114,6 +126,7 @@ static const struct scmi_event system_events[] = {
 };
 
 static const struct scmi_event_ops system_event_ops = {
+	.is_notify_supported = scmi_system_notify_supported,
 	.set_notify_enabled = scmi_system_set_notify_enabled,
 	.fill_custom_report = scmi_system_fill_custom_report,
 };
@@ -147,6 +160,9 @@ static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
 	if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2)
 		pinfo->graceful_timeout_supported = true;
 
+	if (!ph->hops->protocol_msg_check(ph, SYSTEM_POWER_STATE_NOTIFY, NULL))
+		pinfo->power_state_notify_cmd = true;
+
 	return ph->set_priv(ph, pinfo, version);
 }
 
diff --git a/drivers/firmware/tegra/bpmp-debugfs.c b/drivers/firmware/tegra/bpmp-debugfs.c
index bbcdd9fed3fb..4221fed70ad4 100644
--- a/drivers/firmware/tegra/bpmp-debugfs.c
+++ b/drivers/firmware/tegra/bpmp-debugfs.c
@@ -77,7 +77,7 @@ static const char *get_filename(struct tegra_bpmp *bpmp,
 
 	root_path_buf = kzalloc(root_path_buf_len, GFP_KERNEL);
 	if (!root_path_buf)
-		goto out;
+		return NULL;
 
 	root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
 				root_path_buf_len);