Documentation/devicetree/bindings/mfd/retu.txt

File Facts

System

Linux kernel

Corpus path

Documentation/devicetree/bindings/mfd/retu.txt

Extension

.txt

Size

688 bytes

Lines

25

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

Retu and Tahvo are a multi-function devices found on Nokia Internet
Tablets (770, N800 and N810). The Retu chip provides watchdog timer
and power button control functionalities while Tahvo chip provides
USB transceiver functionality.

Required properties:
- compatible:		"nokia,retu" or "nokia,tahvo"
- reg:			Specifies the CBUS slave address of the ASIC chip
- interrupts: 		The interrupt line the device is connected to

Example:

cbus0 {
	compatible = "i2c-cbus-gpio";
	...
	retu: retu@1 {
		compatible = "nokia,retu";
		interrupt-parent = <&gpio4>;
		interrupts = <12 IRQ_TYPE_EDGE_RISING>;
		reg = <0x1>;
	};
};

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

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.