On Wed, Nov 21, 2012 at 04:57:05PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
>
> devicetrees may have a linux,stdout-path or stdout-path property
> in the chosen node describing the console device. This adds a helper
> function to match a device against this property and retrieve the options
> so a driver can call add_preferred_console for a matching device.
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> Cc: linux-serial@xxxxxxxxxxxxxxx
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: kernel@xxxxxxxxxxxxxx
> Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
> drivers/of/base.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/of.h | 7 +++++++
> 2 files changed, 53 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index f2f63c8..72c49ce 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1470,3 +1470,49 @@ 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
> + * @np: Pointer to the given device_node
> + * @option: parsed option
> + *
> + * 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, char **option)
> +{
> + const char *name;
> + struct device_node *dn_stdout;
> + bool is_stdout = 0;
> + const char *tmp;
> + const char *tmp_option;
> +
> + name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> + if (name == NULL)
> + name = of_get_property(of_chosen, "stdout-path", NULL);
> +
> + if (name == NULL)
> + return 0;
> +
> + tmp_option = strchr(name, ':');
> +
> + tmp = kstrndup(name, strlen(name) - strlen(tmp_option), GFP_KERNEL);
tmp_option may be NULL.
> + if (!tmp)
> + return 0;
> +
> + dn_stdout = of_find_node_by_path(tmp);
> +
> + if (dn_stdout && dn_stdout == dn) {
> + is_stdout = 1;
> + tmp_option++;
> + *option = kstrdup(tmp_option, GFP_KERNEL);
> + }
> +
> + of_node_put(dn_stdout);
dn_stdout may be NULL aswell.
Sascha
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