include/linux/mfd/syscon.h

File Facts

System

Linux kernel

Corpus path

include/linux/mfd/syscon.h

Extension

.h

Size

2044 bytes

Lines

81

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/err.h
• linux/errno.h

Detected Declarations

• struct device_node
• function of_syscon_register_regmap

Annotated Snippet

#ifndef __LINUX_MFD_SYSCON_H__
#define __LINUX_MFD_SYSCON_H__

#include <linux/err.h>
#include <linux/errno.h>

struct device_node;

#ifdef CONFIG_MFD_SYSCON
struct regmap *device_node_to_regmap(struct device_node *np);
struct regmap *syscon_node_to_regmap(struct device_node *np);
struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
					       const char *property);
struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
						    const char *property,
						    int arg_count,
						    unsigned int *out_args);
struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
							const char *property);
int of_syscon_register_regmap(struct device_node *np,
			      struct regmap *regmap);
#else
static inline struct regmap *device_node_to_regmap(struct device_node *np)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline struct regmap *syscon_regmap_lookup_by_phandle(
					struct device_node *np,
					const char *property)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
					struct device_node *np,
					const char *property,
					int arg_count,
					unsigned int *out_args)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
					struct device_node *np,
					const char *property)
{
	return NULL;
}

static inline int of_syscon_register_regmap(struct device_node *np,
					struct regmap *regmap)
{
	return -EOPNOTSUPP;
}

#endif

#endif /* __LINUX_MFD_SYSCON_H__ */

Annotation

• Immediate include surface: `linux/err.h`, `linux/errno.h`.
• Detected declarations: `struct device_node`, `function of_syscon_register_regmap`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.