linux-kernel - [PATCH] of: address: Don't fail a lookup just because a node has no reg property

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Date:	Thu,  5 Jul 2012 15:32:34 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	arnd@...db.de, grant.likely@...retlab.ca, rob.herring@...xeda.com,
	devicetree-discuss@...ts.ozlabs.org,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH] of: address: Don't fail a lookup just because a node has no reg property

Sometimes it doesn't make any sense for a node to have an address.
In this case device lookup will always be unsuccessful because we
currently assume every node will have a reg property. This patch
changes the semantics so that the resource address and the lookup
address will only be compared if one exists.

Things like AUXDATA() rely on of_dev_lookup to return the lookup
entry of a particular device in order to do things like apply
platform_data to a device. However, this is currently broken for
nodes which do not have a reg property, meaning that platform_data
can not be passed in those cases.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/of/platform.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 343ad29..9600480 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -317,10 +317,9 @@ static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *l
 	for(; lookup->compatible != NULL; lookup++) {
 		if (!of_device_is_compatible(np, lookup->compatible))
 			continue;
-		if (of_address_to_resource(np, 0, &res))
-			continue;
-		if (res.start != lookup->phys_addr)
-			continue;
+		if (!of_address_to_resource(np, 0, &res))
+			if (res.start != lookup->phys_addr)
+				continue;
 		pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
 		return lookup;
 	}
-- 
1.7.9.5

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