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of/address: Introduce of_get_next_dma_parent() helper

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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>
This commit is contained in:
Robin Murphy 2019-07-03 18:23:01 +01:00 committed by Rob Herring
parent 76dd7068e3
commit 862ab5578f
1 changed files with 10 additions and 0 deletions
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10
drivers/of/address.c
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@ -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;