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fdt: Add function to get a config string from device tree

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Add a function to look up a configuration string such as board name
and returns its value. We look in the "/config" node for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2012-10-25 16:30:59 +00:00
committed by Gerald Van Baren
parent 09258f1e8b
commit 332ab0d54a
2 changed files with 28 additions and 10 deletions
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10
include/fdtdec.h
View File

@@ -367,6 +367,16 @@ int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
int fdtdec_get_config_int(const void *blob, const char *prop_name,
int default_val);
/**
* Look in the FDT for a config item with the given name and return its value
* as a string.
*
* @param blob FDT blob
* @param prop_name property name to look up
* @returns property string, NULL on error.
*/
char *fdtdec_get_config_string(const void *blob, const char *prop_name);
/*
* 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

28
lib/fdtdec.c
View File

@@ -513,16 +513,6 @@ const u8 *fdtdec_locate_byte_array(const void *blob, int node,
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)
{
@@ -534,3 +524,21 @@ int fdtdec_get_config_int(const void *blob, const char *prop_name,
return default_val;
return fdtdec_get_int(blob, config_node, prop_name, default_val);
}
char *fdtdec_get_config_string(const void *blob, const char *prop_name)
{
const char *nodep;
int nodeoffset;
int len;
debug("%s: %s\n", __func__, prop_name);
nodeoffset = fdt_path_offset(blob, "/config");
if (nodeoffset < 0)
return NULL;
nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
if (!nodep)
return NULL;
return (char *)nodep;
}