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Subject[PATCH v2 1/2] remoteproc: core: Add rproc OF look-up functions
Date
- of_rproc_by_index(): look-up and obtain a reference to a rproc
using the DT phandle "rprocs" and a index.

- of_rproc_by_name(): lookup and obtain a reference to a rproc
using the DT phandle "rprocs" and "rproc-names".

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

v1 => v2:
- s/ti,rprocs/ti,rproc

drivers/remoteproc/remoteproc_core.c | 78 +++++++++++++++++++++++++++++++++++-
include/linux/remoteproc.h | 25 +++++++++++-
2 files changed, 101 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index fe0539e..fe362fb 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -41,6 +41,8 @@
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <asm/byteorder.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>

#include "remoteproc_internal.h"

@@ -1191,6 +1193,81 @@ out:
}
EXPORT_SYMBOL(rproc_shutdown);

+#ifdef CONFIG_OF
+/**
+ * of_get_rproc_by_index() - lookup and obtain a reference to an rproc
+ * @np: node to search for rproc phandle
+ * @index: index into the phandle list
+ *
+ * This function increments the remote processor's refcount, so always
+ * use rproc_put() to decrement it back once rproc isn't needed anymore.
+ *
+ * Returns a pointer to the rproc struct on success or an appropriate error
+ * code otherwise.
+ */
+struct rproc *of_get_rproc_by_index(struct device_node *np, int index)
+{
+ struct rproc *rproc = NULL, *r;
+ struct device_node *rproc_np;
+
+ if (index < 0) {
+ pr_err("Invalid index: %d\n", index);
+ return ERR_PTR(-EINVAL);
+ }
+
+ rproc_np = of_parse_phandle(np, "rprocs", index);
+ if (!rproc_np) {
+ /* Unfortunately we have to support this, at least for now */
+ rproc_np = of_parse_phandle(np, "ti,rproc", index);
+ if (!rproc_np) {
+ pr_err("Failed to obtain phandle\n");
+ return ERR_PTR(-ENODEV);
+ }
+ }
+
+ mutex_lock(&rproc_list_mutex);
+ list_for_each_entry(r, &rproc_list, node) {
+ if (r->dev.parent && r->dev.parent->of_node == rproc_np) {
+ get_device(&r->dev);
+ rproc = r;
+ break;
+ }
+ }
+ mutex_unlock(&rproc_list_mutex);
+
+ of_node_put(rproc_np);
+
+ if (!rproc)
+ pr_err("Could not find rproc, deferring\n");
+
+ return rproc ?: ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL(of_get_rproc_by_index);
+
+/**
+ * of_get_rproc_by_name() - lookup and obtain a reference to an rproc
+ * @np: node to search for rproc
+ * @name: name of the remoteproc from device's point of view
+ *
+ * This function increments the remote processor's refcount, so always
+ * use rproc_put() to decrement it back once rproc isn't needed anymore.
+ *
+ * Returns a pointer to the rproc struct on success or an appropriate error
+ * code otherwise.
+ */
+struct rproc *of_get_rproc_by_name(struct device_node *np, const char *name)
+{
+ int index;
+
+ if (unlikely(!name))
+ return ERR_PTR(-EINVAL);
+
+ index = of_property_match_string(np, "rproc-names", name);
+
+ return of_get_rproc_by_index(np, index);
+}
+EXPORT_SYMBOL(of_get_rproc_by_name);
+
/**
* rproc_get_by_phandle() - find a remote processor by phandle
* @phandle: phandle to the rproc
@@ -1203,7 +1280,6 @@ EXPORT_SYMBOL(rproc_shutdown);
*
* Returns the rproc handle on success, and NULL on failure.
*/
-#ifdef CONFIG_OF
struct rproc *rproc_get_by_phandle(phandle phandle)
{
struct rproc *rproc = NULL, *r;
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 1c457a8..f130938 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -487,7 +487,6 @@ struct rproc_vdev {
u32 rsc_offset;
};

-struct rproc *rproc_get_by_phandle(phandle phandle);
struct rproc *rproc_alloc(struct device *dev, const char *name,
const struct rproc_ops *ops,
const char *firmware, int len);
@@ -511,4 +510,28 @@ static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
return rvdev->rproc;
}

+#ifdef CONFIG_OF
+extern struct rproc *of_get_rproc_by_index(struct device_node *np,
+ int index);
+extern struct rproc *of_get_rproc_by_name(struct device_node *np,
+ const char *name);
+extern struct rproc *rproc_get_by_phandle(phandle phandle);
+#else
+static inline
+struct rproc *of_get_rproc_by_index(struct device_node *np, int index)
+{
+ return NULL;
+}
+static inline
+struct rproc *of_get_rproc_by_name(struct device_node *np, const char *name)
+{
+ return NULL;
+}
+static inline
+struct rproc *rproc_get_by_phandle(phandle phandle)
+{
+ return NULL;
+}
+#endif /* CONFIG_OF */
+
#endif /* REMOTEPROC_H */
--
2.9.0
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