of/address: Introduce of_get_next_dma_parent() helper

Add of_get_next_dma_parent() helper which is similar to
__of_get_dma_parent(), but can be used in iterators and decrements the
ref count on the prior parent.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 53d2656c226907d31e2471a17ee4d0f479779774..e9188c82fdae7c8079b8777d8b91ebf32c35d553 100644 (file)
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -695,6 +695,16 @@ static struct device_node *__of_get_dma_parent(const struct device_node *np)
        return of_node_get(args.np);
 }
 
+static struct device_node *of_get_next_dma_parent(struct device_node *np)
+{
+       struct device_node *parent;
+
+       parent = __of_get_dma_parent(np);
+       of_node_put(np);
+
+       return parent;
+}
+
 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
 {
        struct device_node *host;