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authorThierry Reding <thierry.reding@avionic-design.de>2012-07-26 23:55:10 +0400
committerRob Herring <rob.herring@calxeda.com>2012-09-07 20:31:23 +0400
commite38c0a1fbc5803cbacdaac0557c70ac8ca5152e7 (patch)
tree8173068856ea116c00c91ff04aac341a6da8b160 /drivers/of
parenta4f8bf220e415318c739243aaeb2471cf5e8c911 (diff)
downloadlinux-e38c0a1fbc5803cbacdaac0557c70ac8ca5152e7.tar.xz
of/address: Handle #address-cells > 2 specially
When a bus specifies #address-cells > 2, of_bus_default_map() now assumes that the mapping isn't for a physical address but rather an identifier that needs to match exactly. This is required by bindings that use multiple cells to translate a resource to the parent bus (device index, type, ...). See here for the discussion: https://lists.ozlabs.org/pipermail/devicetree-discuss/2012-June/016577.html Originally-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/address.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 7a07751428de..72e496f1e9b0 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -69,6 +69,14 @@ static u64 of_bus_default_map(u32 *addr, const __be32 *range,
(unsigned long long)cp, (unsigned long long)s,
(unsigned long long)da);
+ /*
+ * If the number of address cells is larger than 2 we assume the
+ * mapping doesn't specify a physical address. Rather, the address
+ * specifies an identifier that must match exactly.
+ */
+ if (na > 2 && memcmp(range, addr, na * 4) != 0)
+ return OF_BAD_ADDR;
+
if (da < cp || da >= (cp + s))
return OF_BAD_ADDR;
return da - cp;