From 7c89717f82bd305e3102963485f3da160d11bcf6 Mon Sep 17 00:00:00 2001 From: Bjorn Andersson Date: Sun, 27 Aug 2017 22:34:53 -0700 Subject: 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 Signed-off-by: Bjorn Andersson --- drivers/remoteproc/remoteproc_core.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/remoteproc') diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 8072df1f0f94..eab14b414bf0 100644 --- 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); @@ -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 -- cgit v1.2.3