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fdtdec: Add fdt_{addr, size}_unpack() helpers

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These helpers can be used to unpack variables of type fdt_addr_t and
fdt_size_t into a pair of 32-bit variables. This is useful in cases
where such variables need to be written to properties (such as "reg")
of a device tree node where they need to be split into cells.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-03-21 19:10:00 +01:00 committed by Simon Glass
parent 155d0a08fb
commit 4f253ad064
1 changed files with 25 additions and 0 deletions
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25
include/fdtdec.h
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@ -23,6 +23,31 @@
*/
typedef phys_addr_t fdt_addr_t;
typedef phys_size_t fdt_size_t;
static inline fdt32_t fdt_addr_unpack(fdt_addr_t addr, fdt32_t *upper)
{
if (upper)
#ifdef CONFIG_PHYS_64BIT
*upper = addr >> 32;
#else
*upper = 0;
#endif
return addr;
}
static inline fdt32_t fdt_size_unpack(fdt_size_t size, fdt32_t *upper)
{
if (upper)
#ifdef CONFIG_PHYS_64BIT
*upper = size >> 32;
#else
*upper = 0;
#endif
return size;
}
#ifdef CONFIG_PHYS_64BIT
#define FDT_ADDR_T_NONE (-1U)
#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)