[PATCH v3 1/3] soc: qcom: cmd-db: export RPMh accelerator type string helper

RPMh resource addresses encode the accelerator type (ARC, VRM, BCM)
in bits [19:16], matching the cmd_db_hw_type enum values. Add
cmd_db_hw_type_str() to map an RPMh address to its accelerator type
name string using the existing SLAVE_ID() macro, and export it so
drivers that handle raw RPMh addresses can produce human-readable
diagnostic output without duplicating the address encoding knowledge.

Assisted-by: Claude:claude-sonnet-4-5
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Navya Malempati <[email protected]>
Signed-off-by: Maulik Shah <[email protected]>
---
 drivers/soc/qcom/cmd-db.c | 20 ++++++++++++++++++++
 include/soc/qcom/cmd-db.h |  5 +++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
index 3f1eee784387..117f810d5ca4 100644
--- a/drivers/soc/qcom/cmd-db.c
+++ b/drivers/soc/qcom/cmd-db.c
@@ -267,6 +267,26 @@ enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
 }
 EXPORT_SYMBOL_GPL(cmd_db_read_slave_id);
 
+/**
+ * cmd_db_hw_type_str() - Return the name string for an RPMh accelerator address.
+ * @addr: RPMh resource address whose slave ID encodes the accelerator type.
+ *
+ * Extracts the slave ID from bits [19:16] of @addr and maps it to the
+ * corresponding cmd_db_hw_type name.
+ *
+ * Return: A constant string: "ARC", "VRM", "BCM", or "unknown".
+ */
+const char *cmd_db_hw_type_str(u32 addr)
+{
+	switch (SLAVE_ID(addr)) {
+	case CMD_DB_HW_ARC: return "ARC";
+	case CMD_DB_HW_VRM: return "VRM";
+	case CMD_DB_HW_BCM: return "BCM";
+	default:            return "unknown";
+	}
+}
+EXPORT_SYMBOL_GPL(cmd_db_hw_type_str);
+
 #ifdef CONFIG_DEBUG_FS
 static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
 {
diff --git a/include/soc/qcom/cmd-db.h b/include/soc/qcom/cmd-db.h
index 47a6cab75e63..34adc04eac94 100644
--- a/include/soc/qcom/cmd-db.h
+++ b/include/soc/qcom/cmd-db.h
@@ -29,6 +29,8 @@ bool cmd_db_match_resource_addr(u32 addr1, u32 addr2);
 enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
 
 int cmd_db_ready(void);
+
+const char *cmd_db_hw_type_str(u32 addr);
 #else
 static inline u32 cmd_db_read_addr(const char *resource_id)
 { return 0; }
@@ -44,5 +46,8 @@ static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id)
 
 static inline int cmd_db_ready(void)
 { return -ENODEV; }
+
+static inline const char *cmd_db_hw_type_str(u32 addr)
+{ return "unknown"; }
 #endif /* CONFIG_QCOM_COMMAND_DB */
 #endif /* __QCOM_COMMAND_DB_H__ */

-- 
2.43.0