drivers/rtc/nvmem.c
Source file repositories/reference/linux-study-clean/drivers/rtc/nvmem.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/rtc/nvmem.c- Extension
.c- Size
- 752 bytes
- Lines
- 32
- Domain
- Driver Families
- Bucket
- drivers/rtc
- Inferred role
- Driver Families: exported/initcall integration point
- Status
- integration 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.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/err.hlinux/types.hlinux/nvmem-consumer.hlinux/rtc.h
Detected Declarations
function Copyrightexport devm_rtc_nvmem_register
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/*
* RTC subsystem, nvmem interface
*
* Copyright (C) 2017 Alexandre Belloni
*/
#include <linux/err.h>
#include <linux/types.h>
#include <linux/nvmem-consumer.h>
#include <linux/rtc.h>
int devm_rtc_nvmem_register(struct rtc_device *rtc,
struct nvmem_config *nvmem_config)
{
struct device *dev = rtc->dev.parent;
struct nvmem_device *nvmem;
if (!nvmem_config)
return -ENODEV;
nvmem_config->dev = dev;
nvmem_config->owner = rtc->owner;
nvmem_config->add_legacy_fixed_of_cells = true;
nvmem = devm_nvmem_register(dev, nvmem_config);
if (IS_ERR(nvmem))
dev_err(dev, "failed to register nvmem device for RTC\n");
return PTR_ERR_OR_ZERO(nvmem);
}
EXPORT_SYMBOL_GPL(devm_rtc_nvmem_register);
Annotation
- Immediate include surface: `linux/err.h`, `linux/types.h`, `linux/nvmem-consumer.h`, `linux/rtc.h`.
- Detected declarations: `function Copyright`, `export devm_rtc_nvmem_register`.
- Atlas domain: Driver Families / drivers/rtc.
- Implementation status: integration 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.