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Introduce fdt_setprop_placeholder() method 

In some cases you need to add a property but the contents of it
are not known at creation time, merely the extend of it.

This method allows you to create a property of a given size (filled
with garbage) while a pointer to the property data will be provided.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
[dwg: Corrected commit message]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
main
Pantelis Antoniou 2017-07-27 19:33:11 +03:00 committed by David Gibson
parent 0016f8c2aa
commit a33c2247ac
2 changed files with 48 additions and 3 deletions
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20
libfdt/fdt_rw.c
View File

@ -269,8 +269,8 @@ int fdt_set_name(void *fdt, int nodeoffset, const char *name)
return 0;
}

int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
int len, void **prop_data)
{
struct fdt_property *prop;
int err;
@ -283,8 +283,22 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name,
if (err)
return err;

*prop_data = prop->data;
return 0;
}

int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
void *prop_data;
int err;

err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
if (err)
return err;

if (len)
memcpy(prop->data, val, len);
memcpy(prop_data, val, len);
return 0;
}


31
libfdt/libfdt.h
View File

@ -1448,6 +1448,37 @@ int fdt_set_name(void *fdt, int nodeoffset, const char *name);
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len);

/**
* fdt_setprop _placeholder - allocate space for a property
* @fdt: pointer to the device tree blob
* @nodeoffset: offset of the node whose property to change
* @name: name of the property to change
* @len: length of the property value
* @prop_data: return pointer to property data
*
* fdt_setprop_placeholer() allocates the named property in the given node.
* If the property exists it is resized. In either case a pointer to the
* property data is returned.
*
* This function may insert or delete data from the blob, and will
* therefore change the offsets of some existing nodes.
*
* returns:
* 0, on success
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
* contain the new property value
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
* -FDT_ERR_BADLAYOUT,
* -FDT_ERR_BADMAGIC,
* -FDT_ERR_BADVERSION,
* -FDT_ERR_BADSTATE,
* -FDT_ERR_BADSTRUCTURE,
* -FDT_ERR_BADLAYOUT,
* -FDT_ERR_TRUNCATED, standard meanings
*/
int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
int len, void **prop_data);

/**
* fdt_setprop_u32 - set a property to a 32-bit integer
* @fdt: pointer to the device tree blob