bus: fsl-mc: add api to retrieve mc version

Add a new api that returns Management Complex firmware version
and make the required structure public. The api's first user will be
the caam driver for setting prediction resistance bits.

Signed-off-by: Andrei Botila <[e-mail]>
Acked-by: Laurentiu Tudor <[e-mail]>
Reviewed-by: Horia Geantă <[e-mail]>
Cc: Chris Healy <[e-mail]>
Cc: Lucas Stach <[e-mail]>
Cc: Horia Geantă <[e-mail]>
Cc: Herbert Xu <[e-mail]>
Cc: Iuliana Prodan <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Herbert Xu <[e-mail]>

drivers/bus/fsl-mc/fsl-mc-bus.c

···
  */
 #define FSL_MC_DEFAULT_DMA_MASK	(~0ULL)
 
+static struct fsl_mc_version mc_version;
+
 /**
  * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
  * @root_mc_bus_dev: fsl-mc device representing the root DPRC
···
 	u64 start_mc_offset;
 	u64 end_mc_offset;
 	phys_addr_t start_phys_addr;
-};
-
-/**
- * struct mc_version
- * @major: Major version number: incremented on API compatibility changes
- * @minor: Minor version number: incremented on API additions (that are
- *		backward compatible); reset when major version is incremented
- * @revision: Internal revision number: incremented on implementation changes
- *		and/or bug fixes that have no impact on API
- */
-struct mc_version {
-	u32 major;
-	u32 minor;
-	u32 revision;
 };
 
 /**
···
  */
 static int mc_get_version(struct fsl_mc_io *mc_io,
 			  u32 cmd_flags,
-			  struct mc_version *mc_ver_info)
+			  struct fsl_mc_version *mc_ver_info)
 {
 	struct fsl_mc_command cmd = { 0 };
 	struct dpmng_rsp_get_version *rsp_params;
···
 
 	return 0;
 }
+
+/**
+ * fsl_mc_get_version - function to retrieve the MC f/w version information
+ *
+ * Return:	mc version when called after fsl-mc-bus probe; NULL otherwise.
+ */
+struct fsl_mc_version *fsl_mc_get_version(void)
+{
+	if (mc_version.major)
+		return &mc_version;
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(fsl_mc_get_version);
 
 /**
  * fsl_mc_get_root_dprc - function to traverse to the root dprc
···
 	int container_id;
 	phys_addr_t mc_portal_phys_addr;
 	u32 mc_portal_size;
-	struct mc_version mc_version;
 	struct resource res;
 
 	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);

include/linux/fsl/mc.h

···
 
 void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
 
+/**
+ * struct fsl_mc_version
+ * @major: Major version number: incremented on API compatibility changes
+ * @minor: Minor version number: incremented on API additions (that are
+ *		backward compatible); reset when major version is incremented
+ * @revision: Internal revision number: incremented on implementation changes
+ *		and/or bug fixes that have no impact on API
+ */
+struct fsl_mc_version {
+	u32 major;
+	u32 minor;
+	u32 revision;
+};
+
+struct fsl_mc_version *fsl_mc_get_version(void);
+
 int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
 					u16 mc_io_flags,
 					struct fsl_mc_io **new_mc_io);