Documentation/devicetree/bindings/arm/atmel,at91rm9200-sdramc.yaml
Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/arm/atmel,at91rm9200-sdramc.yaml
File Facts
- System
- Linux kernel
- Corpus path
Documentation/devicetree/bindings/arm/atmel,at91rm9200-sdramc.yaml- Extension
.yaml- Size
- 1655 bytes
- Lines
- 67
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: configuration, schema, or hardware description
- 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
dt-bindings/clock/at91.h
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/arm/atmel,at91rm9200-sdramc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Microchip (Atmel) SDRAM / DDR Controller (RAMC / DDRAMC / UDDRC)
maintainers:
- Nicolas Ferre <nicolas.ferre@microchip.com>
- Claudiu Beznea <claudiu.beznea@tuxon.dev>
description:
The SDRAM/DDR Controller (often called RAMC or DDRAMC) in various
Atmel/Microchip ARM9 and Cortex-A5/A7 SoCs manages external
SDRAM / DDR memory. It is typically exposed as a syscon node for
register access from other drivers (e.g. for initialization or mode
configuration). No interrupts or clocks are usually required in the
binding.
properties:
compatible:
oneOf:
- items:
- const: atmel,at91rm9200-sdramc
- const: syscon
- items:
- const: microchip,sama7d65-uddrc
- const: microchip,sama7g5-uddrc
- enum:
- atmel,at91sam9260-sdramc
- atmel,at91sam9g45-ddramc
- atmel,sama5d3-ddramc
- microchip,sam9x60-ddramc
- microchip,sam9x7-ddramc
- microchip,sama7g5-uddrc
reg:
maxItems: 1
clocks:
minItems: 1
maxItems: 2
clock-names:
minItems: 1
items:
- const: ddrck
- const: mpddr
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/clock/at91.h>
ramc@ffffe400 {
compatible = "atmel,at91sam9g45-ddramc";
reg = <0xffffe400 0x200>;
clocks = <&pmc PMC_TYPE_SYSTEM 2>;
clock-names = "ddrck";
};
...
Annotation
- Immediate include surface: `dt-bindings/clock/at91.h`.
- 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.