linux-kernel - Add ExynosAuto ABOX generic platform and PCM support

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Message-Id: <20250721023052.3586000-1-ew.kim@samsung.com>
Date: Mon, 21 Jul 2025 11:30:43 +0900
From: ew kim <ew.kim@...sung.com>
To: broonie@...nel.org, s.nawrocki@...sung.com, robh@...nel.org,
	krzk+dt@...nel.org
Cc: lgirdwood@...il.com, tiwai@...e.com, perex@...ex.cz,
	conor+dt@...nel.org, alim.akhtar@...sung.com, linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Add ExynosAuto ABOX generic platform and PCM support

This patch series adds the ABOX Generic audio management driver for
Samsung ExynosAuto SoCs, along with IPC messaging and PCM frontend
drivers, including their corresponding device tree bindings.

### ABOX Architecture Design: Fixed and Variable Structure

The ABOX audio framework is designed with a clear split between:
- **Fixed part** (common framework): reusable components across SoCs
  - Generic ABOX platform driver
  - IPC messaging handler
  - PCM frontend with ALSA compressed audio support
  - Solution manager for dynamic control
- **Variable part** (SoC-specific): defined via device tree
  - IRQ numbers, stream IDs, buffer sizes, and ADSP allocation
  - Defined per PCM/IPC device node in DTS

This separation allows the fixed part to be upstreamed and maintained
as a reusable framework, while only the DTS and minimal changes are
needed to adapt to each SoC generation.

### Major Components in This Series

- `abox_generic`: Root platform driver coordinating subcomponents
- `abox_ipc_generic`: Handles ADSP messaging via IRQ-based IPC
- `abox_pcm_dev`: PCM frontend with support for solution chain selection
- `abox_solution_mgr`: Manages software-based audio chains via dynamic
  kcontrols

### Testing

Tested on ExynosAuto v920 board:
- Verified ALSA compressed audio playback via DSP
- Confirmed solution switching via kcontrol
- Verified DT node parsing and IRQ routing from device tree