redonkable
/
remarkable-uboot
1
0
Fork 0
Code Releases Activity

libfdt: Add a function to write a property placeholder 

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 adust the existing fdt_property() to
use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
utp
Simon Glass 2016-02-22 22:55:39 -07:00 committed by Tom Rini
parent cc7a64447b
commit f8a2d7a416
2 changed files with 30 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/libfdt.h
View File

@ -1181,6 +1181,22 @@ static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
{
return fdt_property_u32(fdt, name, val);
}
/**
* fdt_property_placeholder - add a new property and return a ptr to its value
*
* @fdt: pointer to the device tree blob
* @name: name of property to add
* @len: length of property value in bytes
* @valp: returns a pointer to where where the value should be placed
*
* returns:
* 0, on success
* -FDT_ERR_BADMAGIC,
* -FDT_ERR_NOSPACE, standard meanings
*/
int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp);
#define fdt_property_string(fdt, name, str) \
fdt_property(fdt, name, str, strlen(str)+1)
int fdt_end_node(void *fdt);

16
lib/libfdt/fdt_sw.c
View File

@ -175,7 +175,7 @@ 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;
@ -193,7 +193,19 @@ 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;
}