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fdt: Add fdtdec functions to read byte array

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Sometimes we don't need a full cell for each value. This provides
a simple function to read a byte array, both with and without
copying it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Anton Staff 2012-04-17 09:01:28 +00:00 • committed by Albert ARIBAUD
parent 649d0ffbc1
commit bed4d89277
2 changed files with 56 additions and 0 deletions
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32
include/fdtdec.h
View file

@ -349,3 +349,35 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
* @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error
*/
int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
/*
* Look up a property in a node and return its contents in a byte
* array of given length. The property must have at least enough data for
* the array (count bytes). It may have more, but this will be ignored.
*
* @param blob FDT blob
* @param node node to examine
* @param prop_name name of property to find
* @param array array to fill with data
* @param count number of array elements
* @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
* or -FDT_ERR_BADLAYOUT if not enough data
*/
int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
u8 *array, int count);
/**
* Look up a property in a node and return a pointer to its contents as a
* byte array of given length. The property must have at least enough data
* for the array (count bytes). It may have more, but this will be ignored.
* The data is not copied.
*
* @param blob FDT blob
* @param node node to examine
* @param prop_name name of property to find
* @param count number of array elements
* @return pointer to byte array if found, or NULL if the property is not
* found or there is not enough data
*/
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
const char *prop_name, int count);

24
lib/fdtdec.c
View file

@ -476,3 +476,27 @@ int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
return -1;
return 0;
}
int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
u8 *array, int count)
{
const u8 *cell;
int err;
cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
if (!err)
memcpy(array, cell, count);
return err;
}
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
const char *prop_name, int count)
{
const u8 *cell;
int err;
cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
if (err)
return NULL;
return cell;
}