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of: base: add support to get machine model name

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Currently platforms/drivers needing to get the machine model name are
replicating the same snippet of code. In some case, the OF reference
counting is either missing or incorrect.

This patch adds support to read the machine model name either using
the "model" or the "compatible" property in the device tree root node
to the core OF/DT code.

This can be used to remove all the duplicate code snippets doing exactly
same thing later.

Cc: Rob Herring <[email protected]>
Cc: Frank Rowand <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
This commit is contained in:
Sudeep Holla 2016-11-17 15:32:54 +00:00 • committed by Rob Herring
commit e5269794d2
2 changed files with 38 additions and 0 deletions
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32
drivers/of/base.c
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@ -545,6 +545,38 @@ int of_machine_is_compatible(const char *compat)
}
EXPORT_SYMBOL(of_machine_is_compatible);
/**
* of_machine_get_model_name - Find and read the model name or the compatible
* value for the machine.
* @model: pointer to null terminated return string, modified only if
* return value is 0.
*
* Returns a string containing either the model name or the compatible value
* of the machine if found, else return error.
*
* Search for a machine model name or the compatible if model name is missing
* in a device tree node and retrieve a null terminated string value (pointer
* to data, not a copy). Returns 0 on success, -EINVAL if root of the device
* tree is not found and other error returned by of_property_read_string on
* failure.
*/
int of_machine_get_model_name(const char **model)
{
int error;
if (!of_node_get(of_root))
return -EINVAL;
error = of_property_read_string(of_root, "model", model);
if (error)
error = of_property_read_string_index(of_root, "compatible",
0, model);
of_node_put(of_root);
return error;
}
EXPORT_SYMBOL(of_machine_get_model_name);
/**
* __of_device_is_available - check if a device is available for use
*