[PATCH v5 03/14] gtrace: Add RISC-V platform driver for the gtrace framework

[Mayuresh Chitale]

On Fri, Sep 11, 2026 at 2:54 PM Zane Leung <liangzhen at linux.spacemit.com> wrote:
>
> On 8/10/2026 11:22 PM, Mayuresh Chitale wrote:
>
> > +static int rvtrace_of_parse_outconns(struct gtrace_platform_data *pdata)
> > +{
> > +     struct device_node *parent, *ep_node, *rep_node, *rdev_node;
> > +     struct gtrace_connection *conn;
> > +     struct of_endpoint ep, rep;
> > +     int ret = 0, i = 0;
> > +
> > +     parent = of_get_child_by_name(dev_of_node(pdata->dev), "out-ports");
> > +     if (!parent)
> > +             return 0;
> > +
> > +     pdata->nr_outconns = of_graph_get_endpoint_count(parent);
> > +     pdata->outconns = devm_kcalloc(pdata->dev, pdata->nr_outconns,
> > +                                    sizeof(*pdata->outconns), GFP_KERNEL);
> > +     if (!pdata->outconns) {
> > +             ret = -ENOMEM;
> > +             goto done;
> > +     }
> > +
> > +     for_each_endpoint_of_node(parent, ep_node) {
> > +             conn = devm_kzalloc(pdata->dev, sizeof(*conn), GFP_KERNEL);
> > +             if (!conn) {
> > +                     of_node_put(ep_node);
> > +                     ret = -ENOMEM;
> > +                     break;
> > +             }
> > +
> > +             ret = of_graph_parse_endpoint(ep_node, &ep);
> > +             if (ret) {
> > +                     of_node_put(ep_node);
> > +                     break;
> > +             }
> > +
> > +             rep_node = of_graph_get_remote_endpoint(ep_node);
> > +             if (!rep_node) {
> > +                     ret = -ENODEV;
> > +                     of_node_put(ep_node);
> > +                     break;
> > +             }
> > +             rdev_node = of_graph_get_port_parent(rep_node);
> > +
> > +             ret = of_graph_parse_endpoint(rep_node, &rep);
> > +             if (ret) {
> > +                     of_node_put(ep_node);
> > +                     of_node_put(rep_node);
> > +                     of_node_put(rdev_node);
> > +                     break;
> > +             }
> > +
> > +             conn->src_port = ep.port;
> > +             conn->src_fwnode = dev_fwnode(pdata->dev);
> > +             /* The 'src_comp' is set by gtrace_register_component() */
> > +             conn->src_comp = NULL;
> > +             conn->dest_port = rep.port;
> > +             conn->dest_fwnode = of_fwnode_handle(rdev_node);
> > +             fwnode_handle_get(conn->dest_fwnode);
> > +             conn->dest_comp = gtrace_find_by_fwnode(conn->dest_fwnode);
> > +             if (!conn->dest_comp) {
> > +                     ret = -EPROBE_DEFER;
> > +                     of_node_put(ep_node);
> > +                     of_node_put(rep_node);
> > +                     of_node_put(rdev_node);
> > +                     break;
> > +             }
> > +
> > +             pdata->outconns[i] = conn;
> > +             i++;
> > +     }
> > +
> > +done:
> > +     if (ret) {
> > +             for (i = 0; i < pdata->nr_outconns && pdata->outconns; i++) {
> > +                     conn = pdata->outconns[i];
> > +                     if (conn && conn->dest_fwnode)
> > +                             fwnode_handle_put(conn->dest_fwnode);
> > +             }
> > +     }
> > +     of_node_put(parent);
> > +     return ret;
> > +}
> > +
> > +static int rvtrace_of_parse_inconns(struct gtrace_platform_data *pdata)
> > +{
> > +     struct device_node *parent;
> > +     int ret = 0;
> > +
> > +     parent = of_get_child_by_name(dev_of_node(pdata->dev), "in-ports");
> > +     if (!parent)
> > +             return 0;
> > +
> > +     pdata->nr_inconns = of_graph_get_endpoint_count(parent);
> > +     pdata->inconns = devm_kcalloc(pdata->dev, pdata->nr_inconns,
> > +                                   sizeof(*pdata->inconns), GFP_KERNEL);
> > +     if (!pdata->inconns)
> > +             ret = -ENOMEM;
> > +
> > +     of_node_put(parent);
> > +     return ret;
> > +}
>
> Hi,
>
> These functions operate solely on generic gtrace structures.They shoul
> be moved to the gtrace core as common helpers to avoid duplication.
> This is particularly important for mixed topologies where RISC-V
> trace components (e.g., ATB bridge) connect directly to CoreSight
> components (e.g., funnel, TMC).
>
Yes, I have moved them into separate file in v6.
> Regards,
> Zane
>
>
>
>