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libfdt: Add support for appending the values to a existing property 

Some properties may contain multiple values, these values may need
to be added to the property respectively. this patch provides this
functionality. The main purpose of fdt_append_prop() is to append
the values to a existing property, or create a new property if it
dose not exist.

Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Minghuan Lian 2012-08-27 19:38:59 -05:00 committed by Gerald Van Baren
parent 6528ff0109
commit 36ad18a6db
2 changed files with 122 additions and 0 deletions
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95
include/libfdt.h
View File

@ -1133,6 +1133,101 @@ static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
/**
* fdt_appendprop - append to or create a property
* @fdt: pointer to the device tree blob
* @nodeoffset: offset of the node whose property to change
* @name: name of the property to append to
* @val: pointer to data to append to the property value
* @len: length of the data to append to the property value
*
* fdt_appendprop() appends the value to the named property in the
* given node, creating the property if it does not already exist.
*
* This function may insert data into 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_appendprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len);
/**
* fdt_appendprop_cell - append a single cell value to 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
* @val: 32-bit integer value to append to the property (native endian)
*
* fdt_appendprop_cell() appends the given cell value (converting to
* big-endian if necessary) to the value of the named property in the
* given node, or creates a new property with that value if it does
* not already exist.
*
* This function may insert data into 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
*/
static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
const char *name, uint32_t val)
{
val = cpu_to_fdt32(val);
return fdt_appendprop(fdt, nodeoffset, name, &val, sizeof(val));
}
/**
* fdt_appendprop_string - append a string to 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
* @str: string value to append to the property
*
* fdt_appendprop_string() appends the given string to the value of
* the named property in the given node, or creates a new property
* with that value if it does not already exist.
*
* This function may insert data into 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
*/
#define fdt_appendprop_string(fdt, nodeoffset, name, str) \
fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
/**
* fdt_delprop - delete a property
* @fdt: pointer to the device tree blob

27
lib/libfdt/fdt_rw.c
View File

@ -293,6 +293,33 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name,
return 0;
}
int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
struct fdt_property *prop;
int err, oldlen, newlen;
FDT_RW_CHECK_HEADER(fdt);
prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
if (prop) {
newlen = len + oldlen;
err = _fdt_splice_struct(fdt, prop->data,
FDT_TAGALIGN(oldlen),
FDT_TAGALIGN(newlen));
if (err)
return err;
prop->len = cpu_to_fdt32(newlen);
memcpy(prop->data + oldlen, val, len);
} else {
err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
if (err)
return err;
memcpy(prop->data, val, len);
}
return 0;
}
int fdt_delprop(void *fdt, int nodeoffset, const char *name)
{
struct fdt_property *prop;