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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>
This commit is contained in:
Bjorn Andersson 2017-08-27 22:34:53 -07:00
parent 4fec0a5a19
commit 7c89717f82
2 changed files with 20 additions and 0 deletions
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18
drivers/remoteproc/remoteproc_core.c
View File

@ -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);
@ -1569,6 +1570,23 @@ 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

2
include/linux/remoteproc.h
View File

@ -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);