On 08/05/2013 07:40 AM, Sascha Hauer wrote:
> 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@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <rob.herring@xxxxxxxxxxx>
There are no existing users that could take advantage of this?
Rob
> ---
> drivers/of/base.c | 26 ++++++++++++++++++++++++++
> include/linux/of.h | 7 +++++++
> 2 files changed, 33 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 5c54279..1c3c79c 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -32,6 +32,7 @@ struct device_node *of_allnodes;
> EXPORT_SYMBOL(of_allnodes);
> struct device_node *of_chosen;
> struct device_node *of_aliases;
> +static struct device_node *of_stdout;
>
> DEFINE_MUTEX(of_aliases_mutex);
>
> @@ -1595,6 +1596,15 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
> of_chosen = of_find_node_by_path("/chosen");
> if (of_chosen == NULL)
> of_chosen = of_find_node_by_path("/chosen@0");
> +
> + if (of_chosen) {
> + const char *name;
> +
> + name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> + if (name)
> + of_stdout = of_find_node_by_path(name);
> + }
> +
> of_aliases = of_find_node_by_path("/aliases");
> if (!of_aliases)
> return;
> @@ -1703,3 +1713,19 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
> return curv;
> }
> EXPORT_SYMBOL_GPL(of_prop_next_string);
> +
> +/**
> + * of_device_is_stdout_path - check if a device node matches the
> + * linux,stdout-path property
> + *
> + * Check if this device node matches the linux,stdout-path property
> + * in the chosen node. return true if yes, false otherwise.
> + */
> +int of_device_is_stdout_path(struct device_node *dn)
> +{
> + if (!of_stdout)
> + return false;
> +
> + return of_stdout == dn;
> +}
> +EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 1fd08ca..429e168 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -343,6 +343,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
> s; \
> s = of_prop_next_string(prop, s))
>
> +int of_device_is_stdout_path(struct device_node *dn);
> +
> #else /* CONFIG_OF */
>
> static inline const char* of_node_full_name(struct device_node *np)
> @@ -505,6 +507,11 @@ static inline int of_machine_is_compatible(const char *compat)
> return 0;
> }
>
> +static inline int of_device_is_stdout_path(struct device_node *dn)
> +{
> + return 0;
> +}
> +
> #define of_match_ptr(_ptr) NULL
> #define of_match_node(_matches, _node) NULL
> #define of_property_for_each_u32(np, propname, prop, p, u) \
>
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