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common: fdt_support: add support for setting usable memory

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Add support for setting linux,usable-memory property in the memory
node of device tree for the kernel [1].

This property holds a base address and size, describing a
limited region in which memory may be considered available for use by
the kernel. Memory outside of this range is not available for use.

[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
This commit is contained in:
Igor Opaniuk 2019-12-03 14:04:46 +02:00 • committed by Stefano Babic
parent 1fae23899c
commit 949b5a969d
2 changed files with 36 additions and 0 deletions
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1
include/fdt_support.h
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@ -94,6 +94,7 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size);
*/
#ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks);
int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int banks);
#else
static inline int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[],
int banks)