From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Mon, 28 Aug 2017 05:34:53 +0000 (-0700)
Subject: remoteproc: Introduce rproc handle accessor for children
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7c89717f82bd305e3102963485f3da160d11bcf6;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 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
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);