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Add a libfdt function to write a property placeholder

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The existing function to add a new property to a tree being built requires
that the entire contents of the new property be passed in. For some
applications it is more convenient to be able to add the property contents
later, perhaps by reading from a file. This avoids double-buffering of the
contents.

Add a new function to support this and adjust the existing fdt_property() to
use it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Simon Glass 2017-04-01 09:31:41 -06:00 • committed by David Gibson
parent ab15256d8d
commit 580a9f6c28
7 changed files with 40 additions and 2 deletions
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16
libfdt/fdt_sw.c
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@ -220,7 +220,7 @@ static int _fdt_find_add_string(void *fdt, const char *s)
return offset;
}
int fdt_property(void *fdt, const char *name, const void *val, int len)
int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
{
struct fdt_property *prop;
int nameoff;
@ -238,7 +238,19 @@ int fdt_property(void *fdt, const char *name, const void *val, int len)
prop->tag = cpu_to_fdt32(FDT_PROP);
prop->nameoff = cpu_to_fdt32(nameoff);
prop->len = cpu_to_fdt32(len);
memcpy(prop->data, val, len);
*valp = prop->data;
return 0;
}
int fdt_property(void *fdt, const char *name, const void *val, int len)
{
void *ptr;
int ret;
ret = fdt_property_placeholder(fdt, name, len, &ptr);
if (ret)
return ret;
memcpy(ptr, val, len);
return 0;
}