drivers/pinctrl/pinctrl-mcp23s08.h

File Facts

System

Linux kernel

Corpus path

drivers/pinctrl/pinctrl-mcp23s08.h

Extension

.h

Size

1245 bytes

Lines

61

Domain

Driver Families

Bucket

drivers/pinctrl

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/gpio/driver.h
• linux/irq.h
• linux/mutex.h
• linux/pinctrl/pinctrl.h
• linux/types.h

Detected Declarations

• struct device
• struct regmap
• struct pinctrl_dev
• struct mcp23s08_info
• struct mcp23s08

Annotated Snippet

struct mcp23s08_info {
	const struct regmap_config *regmap;
	const char *label;
	unsigned int type;
	u16 ngpio;
	bool reg_shift;
};

struct mcp23s08 {
	u8			addr;
	bool			irq_active_high;
	bool			reg_shift;

	u16			irq_rise;
	u16			irq_fall;
	int			irq;
	bool			irq_controller;
	int			cached_gpio;
	/* lock protects regmap access with bypass/cache flags */
	struct mutex		lock;

	struct gpio_chip	chip;

	struct regmap		*regmap;
	struct device		*dev;

	struct pinctrl_dev	*pctldev;
	struct pinctrl_desc	pinctrl_desc;
	struct gpio_desc        *reset_gpio;
};

extern const struct regmap_config mcp23x08_regmap;
extern const struct regmap_config mcp23x17_regmap;

int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
		       unsigned int addr, unsigned int type, unsigned int base);

Annotation

• Immediate include surface: `linux/gpio/driver.h`, `linux/irq.h`, `linux/mutex.h`, `linux/pinctrl/pinctrl.h`, `linux/types.h`.
• Detected declarations: `struct device`, `struct regmap`, `struct pinctrl_dev`, `struct mcp23s08_info`, `struct mcp23s08`.
• Atlas domain: Driver Families / drivers/pinctrl.
• 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.