linux-kernel - [PATCH v2 0/4] irqchip: Add support for Aspeed AST2700 SCU interrupt controller

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Message-ID: <20250831021438.976893-1-ryan_chen@aspeedtech.com>
Date: Sun, 31 Aug 2025 10:14:34 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: ryan_chen <ryan_chen@...eedtech.com>, Eddie James <eajames@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>,
	Lee Jones <lee@...nel.org>, <linux-aspeed@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 0/4] irqchip: Add support for Aspeed AST2700 SCU interrupt controller

This series adds support for the SCU (System Control Unit) interrupt
controllers on the Aspeed AST2700 SoC.

AST2700 follows the same multi-instance SCU interrupt controller design
as AST2600, with four independent interrupt domains (scu-ic0 to 3).
However, unlike previous SoCs that use a single register for both enable
and status bits, AST2700 splits them into separate IER (Interrupt Enable)
and ISR (Interrupt Status) registers.

To support this, the driver is refactored to use a variant-based init
structure, selected by compatible string. Register access is also
converted from regmap to MMIO (via `of_iomap()`), and a per-variant
IRQ handler is used depending on register layout.

v2:
- Refactor SCU IC driver to support variant-based initialization
- Add AST2700 compatible strings to YAML and header files
- Extend DT bindings in mfd and irqchip for AST2700
- Add IRQ handler logic for separate IER/ISR layout

Ryan Chen (4):
  irqchip/aspeed-scu-ic: Refactor driver to support variant-based
    initialization
  dt-bindings: mfd: aspeed: Add AST2700 SCU compatibles
  dt-bindings: interrupt-controller: aspeed: Add AST2700 SCU IC
    compatibles
  irqchip/aspeed-scu-ic: Add support AST2700 SCU interrupt controllers

 .../aspeed,ast2500-scu-ic.yaml                |   6 +-
 .../bindings/mfd/aspeed,ast2x00-scu.yaml      |   4 +
 drivers/irqchip/irq-aspeed-scu-ic.c           | 238 ++++++++++--------
 .../interrupt-controller/aspeed-scu-ic.h      |  14 ++
 4 files changed, 163 insertions(+), 99 deletions(-)

-- 
2.34.1