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OF: Add helper for matching against linux,stdout-path
devicetrees may have a linux,stdout-path property in the chosen node describing the console device. This adds a helper function to match a device against this property so a driver can call add_preferred_console for a matching device. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 33 additions and 0 deletions
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@ -32,6 +32,7 @@ struct device_node *of_allnodes;
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EXPORT_SYMBOL(of_allnodes);
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EXPORT_SYMBOL(of_allnodes);
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struct device_node *of_chosen;
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struct device_node *of_chosen;
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struct device_node *of_aliases;
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struct device_node *of_aliases;
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static struct device_node *of_stdout;
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DEFINE_MUTEX(of_aliases_mutex);
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DEFINE_MUTEX(of_aliases_mutex);
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@ -1595,6 +1596,15 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
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of_chosen = of_find_node_by_path("/chosen");
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of_chosen = of_find_node_by_path("/chosen");
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if (of_chosen == NULL)
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if (of_chosen == NULL)
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of_chosen = of_find_node_by_path("/chosen@0");
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of_chosen = of_find_node_by_path("/chosen@0");
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if (of_chosen) {
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const char *name;
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name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (name)
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of_stdout = of_find_node_by_path(name);
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}
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of_aliases = of_find_node_by_path("/aliases");
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of_aliases = of_find_node_by_path("/aliases");
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if (!of_aliases)
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if (!of_aliases)
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return;
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return;
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@ -1703,3 +1713,19 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
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return curv;
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return curv;
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}
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}
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EXPORT_SYMBOL_GPL(of_prop_next_string);
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EXPORT_SYMBOL_GPL(of_prop_next_string);
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/**
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* of_device_is_stdout_path - check if a device node matches the
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* linux,stdout-path property
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*
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* Check if this device node matches the linux,stdout-path property
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* in the chosen node. return true if yes, false otherwise.
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*/
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int of_device_is_stdout_path(struct device_node *dn)
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{
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if (!of_stdout)
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return false;
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return of_stdout == dn;
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}
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EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
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@ -343,6 +343,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
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s; \
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s; \
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s = of_prop_next_string(prop, s))
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s = of_prop_next_string(prop, s))
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int of_device_is_stdout_path(struct device_node *dn);
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#else /* CONFIG_OF */
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#else /* CONFIG_OF */
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static inline const char* of_node_full_name(struct device_node *np)
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static inline const char* of_node_full_name(struct device_node *np)
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@ -505,6 +507,11 @@ static inline int of_machine_is_compatible(const char *compat)
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return 0;
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return 0;
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}
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}
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static inline int of_device_is_stdout_path(struct device_node *dn)
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{
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return 0;
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}
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#define of_match_ptr(_ptr) NULL
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#define of_match_ptr(_ptr) NULL
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#define of_match_node(_matches, _node) NULL
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#define of_match_node(_matches, _node) NULL
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#define of_property_for_each_u32(np, propname, prop, p, u) \
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#define of_property_for_each_u32(np, propname, prop, p, u) \
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