ti_sci_*: Add utility to access tisci firmware and SOC capability

Introduce response and request structs for receiving information
regarding FW/SOC capability from DM. The received capability can
further be used to call certain API's based on the feature supoorted
by the DM firmware.

Signed-off-by: Moteen Shah <m-shah@ti.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>

include/linux/soc/ti/ti_sci_protocol.h

@@ -261,6 +261,18 @@ struct ti_sci_core_ops {
 			  u64 *msmc_start, u64 *msmc_end);
 };
 
+/**
+ * struct ti_sci_firmware_ops - DM firmware operations
+ * @query_dm_cap: Query the DM capabilities
+ *                Return 0 for successful query else appropriate error value.
+ */
+struct ti_sci_firmware_ops {
+	int (*query_dm_cap)(struct ti_sci_handle *handle,
+			    u64 *dm_cap);
+};
+
+#define TI_SCI_MSG_FLAG_FW_CAP_DM	0x100
+
 /**
  * struct ti_sci_proc_ops - Processor specific operations.
  *
@@ -609,6 +621,7 @@ struct ti_sci_ops {
 	struct ti_sci_dev_ops dev_ops;
 	struct ti_sci_clk_ops clk_ops;
 	struct ti_sci_core_ops core_ops;
+	struct ti_sci_firmware_ops fw_ops;
 	struct ti_sci_proc_ops proc_ops;
 	struct ti_sci_rm_core_ops rm_core_ops;
 	struct ti_sci_rm_ringacc_ops rm_ring_ops;