On Tue, Oct 20, 2015 at 2:13 PM, Pantelis Antoniou
<pantelis.antoniou@xxxxxxxxxxxx> wrote:
> * A per overlay can_remove sysfs attribute that reports whether
> the overlay can be removed or not due to another overlapping overlay.
>
> * A target sysfs attribute listing the target of each fragment,
> in a group named after the name of the fragment.
>
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
> ---
> drivers/of/overlay.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 99 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 067404e..2d51d9e2 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -25,8 +25,23 @@
>
> #include "of_private.h"
>
> +/* fwd. decl */
> +struct of_overlay;
> +struct of_overlay_info;
> +
> +/* an attribute for each fragment */
> +struct fragment_attribute {
> + struct attribute attr;
> + ssize_t (*show)(struct kobject *kobj, struct fragment_attribute *fattr,
> + char *buf);
> + ssize_t (*store)(struct kobject *kobj, struct fragment_attribute *fattr,
> + const char *buf, size_t count);
> + struct of_overlay_info *ovinfo;
> +};
> +
> /**
> * struct of_overlay_info - Holds a single overlay info
> + * @info: info node that contains the target and overlay
> * @target: target of the overlay operation
> * @overlay: pointer to the overlay contents node
> *
> @@ -34,8 +49,13 @@
> * records.
> */
> struct of_overlay_info {
> + struct of_overlay *ov;
> + struct device_node *info;
> struct device_node *target;
> struct device_node *overlay;
> + struct attribute_group attr_group;
> + struct attribute *attrs[2];
> + struct fragment_attribute target_attr;
> };
>
> /**
> @@ -52,6 +72,7 @@ struct of_overlay {
> struct list_head node;
> int count;
> struct of_overlay_info *ovinfo_tab;
> + const struct attribute_group **attr_groups;
> struct of_changeset cset;
> struct kobject kobj;
> };
> @@ -245,6 +266,8 @@ static int of_fill_overlay_info(struct of_overlay *ov,
> if (ovinfo->target == NULL)
> goto err_fail;
>
> + ovinfo->info = of_node_get(info_node);
> +
> return 0;
>
> err_fail:
> @@ -255,6 +278,17 @@ err_fail:
> return -EINVAL;
> }
>
> +static ssize_t target_show(struct kobject *kobj,
> + struct fragment_attribute *fattr, char *buf)
> +{
> + struct of_overlay_info *ovinfo = fattr->ovinfo;
> +
> + return snprintf(buf, PAGE_SIZE, "%s\n",
> + of_node_full_name(ovinfo->target));
This can be a link to the node itself, can't it?
Rob
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