coresight: Add helper to check if the endpoint is input

Add a helper to check if the given endpoint is input.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/coresight/of_coresight.c

@@ -45,6 +45,11 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 			       endpoint, of_dev_node_match);
 }
 
+static inline bool of_coresight_ep_is_input(struct device_node *ep)
+{
+	return of_property_read_bool(ep, "slave-mode");
+}
+
 static void of_coresight_get_ports(const struct device_node *node,
 				   int *nr_inport, int *nr_outport)
 {
@@ -56,7 +61,7 @@ static void of_coresight_get_ports(const struct device_node *node,
 		if (!ep)
 			break;
 
-		if (of_property_read_bool(ep, "slave-mode"))
+		if (of_coresight_ep_is_input(ep))
 			in++;
 		else
 			out++;
@@ -213,7 +218,7 @@ of_get_coresight_platform_data(struct device *dev,
 		 * No need to deal with input ports, as processing the
 		 * output ports connected to them will process the details.
 		 */
-		if (of_find_property(ep, "slave-mode", NULL))
+		if (of_coresight_ep_is_input(ep))
 			continue;
 
 		ret = of_coresight_parse_endpoint(dev, ep, pdata, i);