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libfdt: Add fdt_setprop_inplace_namelen_partial

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Add a function to modify inplace only a portion of a property..

This is especially useful when the property is an array of values, and you
want to update one of them without changing the DT size.

Acked-by: Simon Glass <sjg@chromium.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[dwg: Remove unnecessary unsigned qualifier, correct a comment]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Maxime Ripard 2016-07-29 11:55:48 +02:00 • committed by David Gibson
parent 3e9037aaad
commit d877364e4a
4 changed files with 60 additions and 5 deletions
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31
libfdt/fdt_wip.c
View file

@ -55,21 +55,42 @@
#include "libfdt_internal.h"
int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
const char *name, int namelen,
uint32_t idx, const void *val,
int len)
{
void *propval;
int proplen;
propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
&proplen);
if (!propval)
return proplen;
if (proplen < (len + idx))
return -FDT_ERR_NOSPACE;
memcpy((char *)propval + idx, val, len);
return 0;
}
int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
const void *propval;
int proplen;
propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
if (! propval)
return proplen;
if (proplen != len)
return -FDT_ERR_NOSPACE;
memcpy(propval, val, len);
return 0;
return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
strlen(name), 0,
val, len);
}
static void _fdt_nop_region(void *start, int len)