[RFC PATCH 5/7] firmware: allow to find manager by device node

[Michael Tretter <m.tretter@pengutronix.de>]

The firmware manager can be found by using the id-String. The id cannot
be used, if the user of the firmware handler is a driver that only has a
handle to the firmware managers devicetree node, because there is no way
to map from the devicetree to the id.

Add a function that allows to get the firmware handler using its device
tree node.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
 common/firmware.c  | 18 ++++++++++++++++++
 include/firmware.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/common/firmware.c b/common/firmware.c
index 9d55d73e7a..609cf11822 100644
--- a/common/firmware.c
+++ b/common/firmware.c
@@ -62,6 +62,24 @@ struct firmware_mgr *firmwaremgr_find(const char *id)
 	return NULL;
 }
 
+/*
+ * firmwaremgr_find_by_node - find a firmware device handler
+ *
+ * Find a firmware device handler using the device node of the firmware
+ * handler. This allows to retrieve the firmware handler with a phandle from
+ * the device tree.
+ */
+struct firmware_mgr *firmwaremgr_find_by_node(const struct device_node *np)
+{
+	struct firmware_mgr *mgr;
+
+	list_for_each_entry(mgr, &firmwaremgr_list, list)
+		if (mgr->handler->dev->parent->device_node == np)
+			return mgr;
+
+	return NULL;
+}
+
 /*
  * firmwaremgr_list_handlers - list registered firmware device handlers
  *                             in pretty format
diff --git a/include/firmware.h b/include/firmware.h
index 284e0f9705..ccd3b0669b 100644
--- a/include/firmware.h
+++ b/include/firmware.h
@@ -34,6 +34,7 @@ struct firmware_mgr;
 int firmwaremgr_register(struct firmware_handler *);
 
 struct firmware_mgr *firmwaremgr_find(const char *);
+struct firmware_mgr *firmwaremgr_find_by_node(const struct device_node *);
 
 void firmwaremgr_list_handlers(void);
 
-- 
2.20.1


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