@@ -579,6 +579,36 @@ struct coresight_device *coresight_get_sink(struct coresight_path *path)
}
EXPORT_SYMBOL_GPL(coresight_get_sink);
+/**
+ * coresight_get_helper: find the helper device of the assigned csdev.
+ *
+ * @csdev: The csdev the helper device is conntected to.
+ * @type: helper_subtype of the expected helper device.
+ *
+ * Retrieve the helper device for the specific csdev based on its
+ * helper_subtype.
+ *
+ * Return: the helper's csdev upon success or NULL for fail.
+ */
+struct coresight_device *coresight_get_helper(struct coresight_device *csdev,
+ int type)
+{
+ int i;
+ struct coresight_device *helper;
+
+ for (i = 0; i < csdev->pdata->nr_outconns; ++i) {
+ helper = csdev->pdata->out_conns[i]->dest_dev;
+ if (!helper || !coresight_is_helper(helper))
+ continue;
+
+ if (helper->subtype.helper_subtype == type)
+ return helper;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(coresight_get_helper);
+
/**
* coresight_get_port_helper: get the in-port number of the helper device
* that is connected to the csdev.
@@ -158,6 +158,8 @@ void coresight_path_assign_trace_id(struct coresight_path *path,
enum cs_mode mode);
int coresight_get_port_helper(struct coresight_device *csdev,
struct coresight_device *helper);
+struct coresight_device *coresight_get_helper(struct coresight_device *csdev,
+ int type);
#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X)
int etm_readl_cp14(u32 off, unsigned int *val);
Retrieving the helper device of the specific coresight device based on its helper_subtype because a single coresight device may has multiple types of the helper devices. Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com> --- drivers/hwtracing/coresight/coresight-core.c | 30 ++++++++++++++++++++ drivers/hwtracing/coresight/coresight-priv.h | 2 ++ 2 files changed, 32 insertions(+)