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.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
drivers/remoteproc/remoteproc_core.c | 18 ++++++++++++++++++
include/linux/remoteproc.h | 2 ++
2 files changed, 20 insertions(+)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 564061dcc019..5b1b19519275 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1296,6 +1296,23 @@ struct rproc *rproc_get_by_phandle(phandle phandle)
EXPORT_SYMBOL(rproc_get_by_phandle);
/**
+ * 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 && !strcmp(dev->type->name, "remoteproc"))
+ return dev->driver_data;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(rproc_get_by_child);
+
+/**
* rproc_add() - register a remote processor
* @rproc: the remote processor handle to register
*
@@ -1440,6 +1457,7 @@ 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);
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 81da49564ff4..44e630eb3d94 100644
--- 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);
--
2.12.0
--
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