linux-kernel - [PATCH 06/11] of/address: Introduce of_get_next_dma

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Message-Id: <20190927002455.13169-7-robh@kernel.org>
Date:   Thu, 26 Sep 2019 19:24:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Robin Murphy <robin.murphy@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stefan Wahren <wahrenst@....net>,
        Frank Rowand <frowand.list@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Marek Vasut <marek.vasut@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Oza Pawandeep <oza.oza@...adcom.com>
Subject: [PATCH 06/11] of/address: Introduce of_get_next_dma_parent() helper

From: Robin Murphy <robin.murphy@....com>

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@....com>
Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/of/address.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 53d2656c2269..e9188c82fdae 100644
--- 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;
-- 
2.20.1