This makes use of the newly introduced usage field in the flash bank
structure.
Also remove the assertion if usage field is null and
lets print a DEBUG_LOG message instead.
Change-Id: I384bf0e2c444fcc99deef73aec9ef01149a91c76
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/391
Tested-by: jenkins
        retval = CALL_COMMAND_HANDLER(controller->nand_device_command, c);
        if (ERROR_OK != retval)
        {
-               assert(controller->usage != NULL);
                LOG_ERROR("'%s' driver rejected nand flash. Usage: %s",
                        controller->name,
                        controller->usage);
                return retval;
        }
 
+       if (controller->usage == NULL)
+               LOG_DEBUG("'%s' driver usage field missing", controller->name);
+
        nand_device_add(c);
 
        return ERROR_OK;
 
        retval = CALL_COMMAND_HANDLER(driver->flash_bank_command, c);
        if (ERROR_OK != retval)
        {
-               LOG_ERROR("'%s' driver rejected flash bank at 0x%8.8" PRIx32,
-                               driver_name, c->base);
+               LOG_ERROR("'%s' driver rejected flash bank at 0x%8.8" PRIx32 "Usage %s",
+                               driver_name, c->base, driver->usage);
                free(c);
                return retval;
        }
 
+       if (driver->usage == NULL)
+               LOG_DEBUG("'%s' driver usage field missing", driver_name);
+
        flash_bank_add(c);
 
        return ERROR_OK;