remoteproc: Introduce rproc handle accessor for children

In certain circumstances rpmsg devices needs to acquire a handle to the
ancestor remoteproc instance, e.g. to invoke rproc_report_crash() when a
fatal error is detected. Introduce an interface that walks the device
tree in search for a remoteproc instance and return this.

Tested-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 8072df1..eab14b4 100644 (file)
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1431,6 +1431,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
        rproc->dev.parent = dev;
        rproc->dev.type = &rproc_type;
        rproc->dev.class = &rproc_class;
+       rproc->dev.driver_data = rproc;
 
        /* Assign a unique device index and name */
        rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
@@ -1570,6 +1571,23 @@ void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
 EXPORT_SYMBOL(rproc_remove_subdev);
 
 /**
+ * rproc_get_by_child() - acquire rproc handle of @dev's ancestor
+ * @dev:       child device to find ancestor of
+ *
+ * Returns the ancestor rproc instance, or NULL if not found.
+ */
+struct rproc *rproc_get_by_child(struct device *dev)
+{
+       for (dev = dev->parent; dev; dev = dev->parent) {
+               if (dev->type == &rproc_type)
+                       return dev->driver_data;
+       }
+
+       return NULL;
+}
+EXPORT_SYMBOL(rproc_get_by_child);
+
+/**
  * rproc_report_crash() - rproc crash reporter function
  * @rproc: remote processor
  * @type: crash type

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 81da495..44e630e 100644 (file)
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -510,6 +510,8 @@ struct rproc_vdev {
 };
 
 struct rproc *rproc_get_by_phandle(phandle phandle);
+struct rproc *rproc_get_by_child(struct device *dev);
+
 struct rproc *rproc_alloc(struct device *dev, const char *name,
                          const struct rproc_ops *ops,
                          const char *firmware, int len);