Hi Rob,
> On Oct 21, 2015, at 00:04 , Rob Herring <robherring2@xxxxxxxxx> wrote:
>
> 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?
>
Yes. Do you want it like this?
> Rob
Regards
— Pantelis
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