leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fdt: Add function to get config int from device tree

Browse Source 
Add a function to look up a configuration item such as machine id
and return its value.

Note: The code has been taken as is from the Chromium u-boot development
tree and needs Simon Glass' sign-off.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Abhilash Kesavan 2012-10-25 16:30:58 +00:00 committed by Gerald Van Baren
parent 59852d0386
commit 09258f1e8b
2 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/fdtdec.h
View File

@ -354,6 +354,19 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
*/
int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
/**
* Look in the FDT for a config item with the given name and return its value
* as a 32-bit integer. The property must have at least 4 bytes of data. The
* value of the first cell is returned.
*
* @param blob FDT blob to use
* @param prop_name Node property name
* @param default_val default value to return if the property is not found
* @return integer value, if found, or default_val if not
*/
int fdtdec_get_config_int(const void *blob, const char *prop_name,
int default_val);
/*
* 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

22
lib/fdtdec.c
View File

@ -512,3 +512,25 @@ const u8 *fdtdec_locate_byte_array(const void *blob, int node,
return NULL;
return cell;
}
/**
* Look in the FDT for a config item with the given name and return its value
* as a 32-bit integer. The property must have at least 4 bytes of data. The
* value of the first cell is returned.
*
* @param blob FDT blob to use
* @param prop_name Node property name
* @param default_val default value to return if the property is not found
* @return integer value, if found, or default_val if not
*/
int fdtdec_get_config_int(const void *blob, const char *prop_name,
int default_val)
{
int config_node;
debug("%s: %s\n", __func__, prop_name);
config_node = fdt_path_offset(blob, "/config");
if (config_node < 0)
return default_val;
return fdtdec_get_int(blob, config_node, prop_name, default_val);
}