linux-kernel - [PATCH] drivers: mfd: allow property as NULL in syscon_early_regmap_lookup_by

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Date:	Sat, 10 May 2014 15:06:54 +0900
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org,
	michal.simek@...inx.com, Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: [PATCH] drivers: mfd: allow property as NULL in
 syscon_early_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_early_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 which points
back to it's own device node in device tree.

Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
Hello,

This patch set depends on early_syscon_initialization patch from
Michal Simek [1]. It allows us to call syscon_early_regmap_lookup_by_phandle
with NULL property. This is similar change posted here [2] for 
syscon_regmap_lookup_by_phandle by me.

[1]: https://lkml.org/lkml/2014/4/8/239
[2]: https://lkml.org/lkml/2014/4/29/661

 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 5457e59..786c6cd 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -103,7 +103,11 @@ struct regmap *syscon_early_regmap_lookup_by_phandle(struct device_node *np,
 	struct device_node *syscon_np;
 	struct syscon *syscon;

-	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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