Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator

File Facts

System: Linux kernel
Corpus path: Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator
Extension: [no extension]
Size: 1334 bytes
Lines: 32
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

What:		/sys/bus/i2c/devices/.../bd9571mwv-regulator.*.auto/backup_mode
Date:		Jul 2018
KernelVersion:	4.19
Contact:	Geert Uytterhoeven <geert+renesas@glider.be>
Description:	Read/write the current state of DDR Backup Mode, which controls
		if DDR power rails will be kept powered during system suspend.
		("on"/"1" = enabled, "off"/"0" = disabled).
		Two types of power switches (or control signals) can be used:

		  A. With a momentary power switch (or pulse signal), DDR
		     Backup Mode is enabled by default when available, as the
		     PMIC will be configured only during system suspend.
		  B. With a toggle power switch (or level signal), the
		     following steps must be followed exactly:

		       1. Configure PMIC for backup mode, to change the role of
			  the accessory power switch from a power switch to a
			  wake-up switch,
		       2. Switch accessory power switch off, to prepare for
			  system suspend, which is a manual step not controlled
			  by software,
		       3. Suspend system,
		       4. Switch accessory power switch on, to resume the
			  system.

		     DDR Backup Mode must be explicitly enabled by the user,
		     to invoke step 1.

		See also Documentation/devicetree/bindings/mfd/rohm,bd9571mwv.yaml.
Users:		User space applications for embedded boards equipped with a
		BD9571MWV PMIC.

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.