fpga: region: add fpga_region_class_find

Add a function for searching the fpga-region class.  This
will be useful when device tree code is no longer in the
same file that declares the fpga-region class.  Another
step in separating common FPGA region code from device
tree support.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 15 insertions, 8 deletions

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 76db81de2cc0..5c0869576cd1 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -30,6 +30,20 @@
 static DEFINE_IDA(fpga_region_ida);
 static struct class *fpga_region_class;
 
+struct fpga_region *fpga_region_class_find(
+        struct device *start, const void *data,
+        int (*match)(struct device *, const void *))
+{
+        struct device *dev;
+
+        dev = class_find_device(fpga_region_class, start, data, match);
+        if (!dev)
+                return NULL;
+
+        return to_fpga_region(dev);
+}
+EXPORT_SYMBOL_GPL(fpga_region_class_find);
+
 static const struct of_device_id fpga_region_of_match[] = {
         { .compatible = "fpga-region", },
         {},
@@ -51,14 +65,7 @@ static int fpga_region_of_node_match(struct device *dev, const void *data)
  */
 static struct fpga_region *of_fpga_region_find(struct device_node *np)
 {
-        struct device *dev;
-
-        dev = class_find_device(fpga_region_class, NULL, np,
-                                fpga_region_of_node_match);
-        if (!dev)
-                return NULL;
-
-        return to_fpga_region(dev);
+        return fpga_region_class_find(NULL, np, fpga_region_of_node_match);
 }
 
 /**