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of: make kobject and bin_attribute support configurable

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Having device_nodes be kobjects is only needed if sysfs or OF_DYNAMIC is
enabled. Otherwise, having a kobject in struct device_node is
unnecessary bloat in minimal kernel configurations.

Likewise, bin_attribute is only needed in struct property when sysfs is
enabled, so we can make it configurable too.

Tested-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Frank Rowand <frowand.list@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2017-10-04 14:09:40 -05:00
parent 0c3c234b95
commit b56b5528f5
7 changed files with 202 additions and 164 deletions
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22
include/linux/of.h
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@ -43,7 +43,9 @@ struct property {
#if defined(CONFIG_OF_PROMTREE)
unsigned int unique_id;
#endif
#if defined(CONFIG_OF_KOBJ)
struct bin_attribute attr;
#endif
};
#if defined(CONFIG_SPARC)
@ -62,7 +64,9 @@ struct device_node {
struct device_node *parent;
struct device_node *child;
struct device_node *sibling;
#if defined(CONFIG_OF_KOBJ)
struct kobject kobj;
#endif
unsigned long _flags;
void *data;
#if defined(CONFIG_SPARC)
@ -107,23 +111,17 @@ extern struct kobj_type of_node_ktype;
extern const struct fwnode_operations of_fwnode_ops;
static inline void of_node_init(struct device_node *node)
{
#if defined(CONFIG_OF_KOBJ)
kobject_init(&node->kobj, &of_node_ktype);
#endif
node->fwnode.ops = &of_fwnode_ops;
}
#if defined(CONFIG_OF_KOBJ)
#define of_node_kobj(n) (&(n)->kobj)
/* true when node is initialized */
static inline int of_node_is_initialized(struct device_node *node)
{
return node && node->kobj.state_initialized;
}
/* true when node is attached (i.e. present on sysfs) */
static inline int of_node_is_attached(struct device_node *node)
{
return node && node->kobj.state_in_sysfs;
}
#else
#define of_node_kobj(n) NULL
#endif
#ifdef CONFIG_OF_DYNAMIC
extern struct device_node *of_node_get(struct device_node *node);