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of/fdt: Add endianness helper function for early init code

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Provide a libfdt-based equivalent for of_device_is_big_endian(), suitable
for use in the early_init_* functions.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Kevin Cernekee 2015-04-09 13:05:15 -07:00 committed by Rob Herring
parent 37786c7fee
commit cc7837867a
2 changed files with 21 additions and 0 deletions
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19
drivers/of/fdt.c
View File

@ -108,6 +108,25 @@ int of_fdt_is_compatible(const void *blob,
return 0;
}
/**
* of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses
* @blob: A device tree blob
* @node: node to test
*
* Returns true if the node has a "big-endian" property, or if the kernel
* was compiled for BE *and* the node has a "native-endian" property.
* Returns false otherwise.
*/
bool of_fdt_is_big_endian(const void *blob, unsigned long node)
{
if (fdt_getprop(blob, node, "big-endian", NULL))
return true;
if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
fdt_getprop(blob, node, "native-endian", NULL))
return true;
return false;
}
/**
* of_fdt_match - Return true if node matches a list of compatible values
*/

2
include/linux/of_fdt.h
View File

@ -33,6 +33,8 @@ extern void *of_fdt_get_property(const void *blob,
extern int of_fdt_is_compatible(const void *blob,
unsigned long node,
const char *compat);
extern bool of_fdt_is_big_endian(const void *blob,
unsigned long node);
extern int of_fdt_match(const void *blob, unsigned long node,
const char *const *compat);
extern void of_fdt_unflatten_tree(unsigned long *blob,