rpmsg: qcom_smd: Add support for "label" property

Add support for the "label" property, used to give the edge a name other
than the one of the DT node. This allows the implementor to provide
consistently named edges when using the rpmsg character device.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 0fae48116a0d..3dd73edaa525 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -117,6 +117,8 @@ static const struct {
 struct qcom_smd_edge {
         struct device dev;
 
+        const char *name;
+
         struct device_node *of_node;
         unsigned edge_id;
         unsigned remote_pid;
@@ -1248,6 +1250,10 @@ static int qcom_smd_parse_edge(struct device *dev,
                 return -EINVAL;
         }
 
+        ret = of_property_read_string(node, "label", &edge->name);
+        if (ret < 0)
+                edge->name = node->name;
+
         irq = irq_of_parse_and_map(node, 0);
         if (irq < 0) {
                 dev_err(dev, "required smd interrupt missing\n");
@@ -1285,6 +1291,21 @@ static void qcom_smd_edge_release(struct device *dev)
         kfree(edge);
 }
 
+static ssize_t rpmsg_name_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+        struct qcom_smd_edge *edge = to_smd_edge(dev);
+
+        return sprintf(buf, "%s\n", edge->name);
+}
+static DEVICE_ATTR_RO(rpmsg_name);
+
+static struct attribute *qcom_smd_edge_attrs[] = {
+        &dev_attr_rpmsg_name.attr,
+        NULL
+};
+ATTRIBUTE_GROUPS(qcom_smd_edge);
+
 /**
  * qcom_smd_register_edge() - register an edge based on an device_node
  * @parent:    parent device for the edge
@@ -1306,6 +1327,7 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent,
 
         edge->dev.parent = parent;
         edge->dev.release = qcom_smd_edge_release;
+        edge->dev.groups = qcom_smd_edge_groups;
         dev_set_name(&edge->dev, "%s:%s", dev_name(parent), node->name);
         ret = device_register(&edge->dev);
         if (ret) {