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Commit cc783786 authored by Kevin Cernekee's avatar Kevin Cernekee Committed by Rob Herring
Browse files

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



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

Signed-off-by: default avatarKevin Cernekee <cernekee@gmail.com>
Reviewed-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 37786c7f

drivers/of/fdt.c

+19 −0
Original line number Diff line number Diff line
@@ -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

 */

include/linux/of_fdt.h

+2 −0
Original line number Diff line number Diff line
@@ -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,