From e5269794d2e9046dd45be15bdb213a229df46b7e Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Thu, 17 Nov 2016 15:32:54 +0000 Subject: of: base: add support to get machine model name 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 Cc: Frank Rowand Cc: Arnd Bergmann Signed-off-by: Sudeep Holla Signed-off-by: Rob Herring --- drivers/of/base.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index d687e6de24a0..128e114f9210 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -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 * -- cgit v1.2.3-58-ga151