linux-kernel - [PATCH] mfd: syscon: allow property as NULL in syscon_regmap_lookup_by

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Message-id: <1398824066-3036-1-git-send-email-pankaj.dubey@samsung.com>
Date:	Wed, 30 Apr 2014 11:14:26 +0900
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org,
	Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: [PATCH] mfd: syscon: allow property as NULL in
 syscon_regmap_lookup_by_phandle

If we pass syscon device node itself as first parameter to this function
there is no need to parse and find syscon device node. So by allowing
"property" parameter as NULL allow syscon_regmap_lookup_by_phandle to
consider passed argument "np" itself as a syscon device node "syscon_np".
This will help us in avoiding addition of "syscon" property in a device node
which points back to same device node in device tree.

Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
 drivers/mfd/syscon.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index dbea55d..b30f941 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -94,7 +94,11 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
 	struct device_node *syscon_np;
 	struct regmap *regmap;
 
-	syscon_np = of_parse_phandle(np, property, 0);
+	if (property)
+		syscon_np = of_parse_phandle(np, property, 0);
+	else
+		syscon_np = np;
+
 	if (!syscon_np)
 		return ERR_PTR(-ENODEV);
 
-- 
1.7.10.4

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