coresight-tmc: add support to set default sink

Add support to set default sink at probe time.

Change-Id: I62abe39a5cb5e7f8b1bb1198cecd3b529b124de8
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>

Documentation/devicetree/bindings/arm/coresight.txt

@@ -68,6 +68,8 @@ its hardware characteristcs.
 	* arm,buffer-size: size of contiguous buffer space for TMC ETR
 	 (embedded trace router)
 
+	* arm,default-sink: represents the default compile time CoreSight sink
+
 * Required property for TPDAs:
 
 	* qcom,tpda-atid: must be present. Specifies the ATID for TPDA.

drivers/hwtracing/coresight/coresight-tmc.c

@@ -1673,6 +1673,8 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 			return -ENOMEM;
 	}
 
+	pdata->default_sink = of_property_read_bool(np, "arm,default-sink");
+
 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 	if (!desc)
 		return -ENOMEM;

drivers/hwtracing/coresight/coresight.c

@@ -795,6 +795,21 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	coresight_fixup_device_conns(csdev);
 	coresight_fixup_orphan_conns(csdev);
 
+	if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
+	    csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
+		if (desc->pdata->default_sink) {
+			if (curr_sink) {
+				dev_warn(&csdev->dev,
+					 "overwritting curr sink %s",
+					 dev_name(&curr_sink->dev));
+				curr_sink->activated = false;
+			}
+
+			curr_sink = csdev;
+			curr_sink->activated = true;
+		}
+	}
+
 	mutex_unlock(&coresight_mutex);
 
 	return csdev;

include/linux/coresight.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2012, 2016 The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -101,6 +101,7 @@ struct coresight_dev_subtype {
 		connected  to.
  * @nr_outport:	number of output ports for this component.
  * @clk:	The clock this component is associated to.
+ * @default_sink: Flag to set default sink
  */
 struct coresight_platform_data {
 	int cpu;
@@ -111,6 +112,7 @@ struct coresight_platform_data {
 	int *child_ports;
 	int nr_outport;
 	struct clk *clk;
+	bool default_sink;
 };
 
 /**