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Introduce fdtw_read_array() helper

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fdtw_read_cells() can only read one or two cells, sometimes it may be
needed to read more cells from one property.

Change-Id: Ie70dc76d1540cd6a04787cde7cccb4d1bafc7282
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz 2018-06-26 10:34:10 +01:00
parent 2747362062
commit 73f1ac6c8e
2 changed files with 41 additions and 1 deletions
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40
common/fdt_wrappers.c
View file

@ -40,7 +40,6 @@ int fdtw_read_cells(const void *dtb, int node, const char *prop,
return -1;
}
/* Verify that property length accords with cell length */
if (NCELLS((unsigned int)value_len) != cells) {
WARN("Property length mismatch\n");
@ -62,6 +61,45 @@ int fdtw_read_cells(const void *dtb, int node, const char *prop,
return 0;
}
/*
* Read cells from a given property of the given node. Any number of 32-bit
* cells of the property can be read. The fdt pointer is updated. Returns 0 on
* success, and -1 on error.
*/
int fdtw_read_array(const void *dtb, int node, const char *prop,
unsigned int cells, void *value)
{
const uint32_t *value_ptr;
int value_len;
assert(dtb != NULL);
assert(prop != NULL);
assert(value != NULL);
assert(node >= 0);
/* Access property and obtain its length (in bytes) */
value_ptr = fdt_getprop_namelen(dtb, node, prop, (int)strlen(prop),
&value_len);
if (value_ptr == NULL) {
WARN("Couldn't find property %s in dtb\n", prop);
return -1;
}
/* Verify that property length accords with cell length */
if (NCELLS((unsigned int)value_len) != cells) {
WARN("Property length mismatch\n");
return -1;
}
uint32_t *dst = value;
for (unsigned int i = 0U; i < cells; i++) {
dst[i] = fdt32_to_cpu(value_ptr[i]);
}
return 0;
}
/*
* Read string from a given property of the given node. Up to 'size - 1'
* characters are read, and a NUL terminator is added. Returns 0 on success,

2
include/common/fdt_wrappers.h
View file

@ -14,6 +14,8 @@
int fdtw_read_cells(const void *dtb, int node, const char *prop,
unsigned int cells, void *value);
int fdtw_read_array(const void *dtb, int node, const char *prop,
unsigned int cells, void *value);
int fdtw_read_string(const void *dtb, int node, const char *prop,
char *str, size_t size);
int fdtw_write_inplace_cells(void *dtb, int node, const char *prop,