intel_th: Output devices without ports don't need assigning

Output subdevices that rely on other output subdevices (or otherwise
don't directly talk to an output port on the switch) don't need to be
assigned an output port either.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>

drivers/hwtracing/intel_th/intel_th.h

@@ -96,6 +96,16 @@ intel_th_device_get_resource(struct intel_th_device *thdev, unsigned int type,
 	return NULL;
 }
 
+/*
+ * GTH, output ports configuration
+ */
+enum {
+	GTH_NONE = 0,
+	GTH_MSU,	/* memory/usb */
+	GTH_CTP,	/* Common Trace Port */
+	GTH_PTI = 4,	/* MIPI-PTI */
+};
+
 /**
  * intel_th_output_assigned() - if an output device is assigned to a switch port
  * @thdev:	the output device
@@ -106,7 +116,8 @@ static inline bool
 intel_th_output_assigned(struct intel_th_device *thdev)
 {
 	return thdev->type == INTEL_TH_OUTPUT &&
-		thdev->output.port >= 0;
+		(thdev->output.port >= 0 ||
+		 thdev->output.type == GTH_NONE);
 }
 
 /**
@@ -249,16 +260,6 @@ enum {
 	REG_DCIH_LENGTH		= REG_MSU_LENGTH,
 };
 
-/*
- * GTH, output ports configuration
- */
-enum {
-	GTH_NONE = 0,
-	GTH_MSU,	/* memory/usb */
-	GTH_CTP,	/* Common Trace Port */
-	GTH_PTI = 4,	/* MIPI-PTI */
-};
-
 /*
  * Scratchpad bits: tell firmware and external debuggers
  * what we are up to.