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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: Rob Herring <rob.herring@calxeda.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2012-07-05 15:15:36 +01:00 committed by Arnd Bergmann
parent 6887a4131d
commit 84774e6157
1 changed files with 3 additions and 4 deletions
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7
drivers/of/platform.c
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@ -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;
}