arch/arm64/boot/dts/renesas/ulcb-simple-audio-card.dtsi
Source file repositories/reference/linux-study-clean/arch/arm64/boot/dts/renesas/ulcb-simple-audio-card.dtsi
File Facts
- System
- Linux kernel
- Corpus path
arch/arm64/boot/dts/renesas/ulcb-simple-audio-card.dtsi- Extension
.dtsi- Size
- 1340 bytes
- Lines
- 94
- Domain
- Architecture Layer
- Bucket
- arch/arm64
- Inferred role
- Architecture Layer: configuration, schema, or hardware description
- Status
- atlas-only
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
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
// SPDX-License-Identifier: GPL-2.0
/*
* Device Tree for ULCB + Simple Audio Card
*
* Copyright (C) 2022 Renesas Electronics Corp.
*/
/*
* (A) CPU0 <----> ak4613
* (B) CPU1 ----> HDMI
*
* (A) aplay -D plughw:0,0 xxx.wav
* (B) aplay -D plughw:0,1 xxx.wav
*
* (A) arecord -D plughw:0,0 xxx.wav
*/
/ {
sound_card: sound {
compatible = "simple-audio-card";
label = "snd-ulcb";
#address-cells = <1>;
#size-cells = <0>;
/*
* (A) CPU0 <-> ak4613
*/
simple-audio-card,dai-link@0 {
reg = <0>;
cpu {
bitclock-master;
frame-master;
sound-dai = <&rcar_sound 0>;
};
codec {
sound-dai = <&ak4613>;
};
};
/*
* (B) CPU1 -> HDMI
*/
simple-audio-card,dai-link@1 {
reg = <1>;
cpu {
bitclock-master;
frame-master;
sound-dai = <&rcar_sound 1>;
};
codec {
sound-dai = <&hdmi0>;
};
};
};
};
&ak4613 {
/*
* (A) CPU0 <-> ak4613
*/
#sound-dai-cells = <0>;
};
&hdmi0 {
/*
* (B) CPU1 -> HDMI
*/
#sound-dai-cells = <0>;
};
Annotation
- Atlas domain: Architecture Layer / arch/arm64.
- 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.