linux-kernel - [PATCH v5 0/3] AST2700 interrupt controller hierarchy support

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Message-ID: <20251022065507.1152071-1-ryan_chen@aspeedtech.com>
Date: Wed, 22 Oct 2025 14:55:04 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: ryan_chen <ryan_chen@...eedtech.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>,
	<jk@...econstruct.com.au>, Kevin Chen <kevin_chen@...eedtech.com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>
Subject: [PATCH v5 0/3] AST2700 interrupt controller hierarchy support

This series introduces YAML bindings and driver support for the
ASPEED AST2700 interrupt controller hierarchy. The AST2700 SoC
contains two top-level interrupt controller blocks, INTC0 and
INTC1, each responsible for routing different interrupt groups
to various CPU targets.

v5:
- Adds two new YAML bindings:
 - aspeed,ast2700-intc0.yaml
 - aspeed,ast2700-intc1.yaml
- irq-aspeed-intc.c
 - add aspeed,ast2700-intc0-ic, aspeed,ast2700-intc0-ic compatible.

v4:
- aspeed,ast2700-intc.yaml
 - Clarify the relationship between INTC0/INTC1 parent nodes, the
   aspeed,ast2700-intc-ic child nodes, and the GIC.
 - Add a block diagram and DT examples showing the cascaded wiring
   (GIC <- INTC0 <- INTC1 children).
 - Mirrors the datasheet-described topology and register map, including
   the separation of INTC0/INTC1 regions.
 - Lets DT unambiguously express first-level (GIC parent) and cascaded
   second-level (INTC0 parent) interrupt controllers via examples that
   use `interrupts` for INTC0 children and `interrupts-extended` for
   INTC1 children routed into INTC0.

- irq-ast2700-intc.c
 - Drop all string decoding and human readable tables.
   Debugfs now dumps raw routing/protection registers only.
 - Split into a separate source file and made it modular
 - If the compatible not match ast2700-intc0/1, bail out return -ENODEV.

v3:
- aspeed,ast2700-intc.yaml
  - Clarify the relationship between INTC0/INTC1 parent nodes, the
    aspeed,ast2700-intc-ic child nodes, and the GIC.
  - Add a block diagram and DT examples showing the cascaded wiring
    (GIC <- INTC0 <- INTC1 children).
  - Mirrors the datasheet-described topology and register map, including
    the separation of INTC0/INTC1 regions and their routing/protection
    registers.
  - Lets DT unambiguously express first-level (GIC parent) and cascaded
    second-level (INTC0 parent) interrupt controllers via examples that
    use `interrupts` for INTC0 children and `interrupts-extended` for
    INTC1 children routed into INTC0.
  
- irq-aspeed-intc.c
  - separate c file from irq-aspeed-intc.c
  - make m

v2:
- fix dt bindingcheck

Ryan Chen (3):
  dt-bindings: interrupt-controller: aspeed,ast2700: Add support for
    INTC hierarchy
  Irqchip/ast2700-intc: add debugfs support for routing/protection
    display
  irqchip: aspeed: add compatible strings for ast2700-intc0-ic and
    ast2700-intc1-ic

 .../aspeed,ast2700-intc0.yaml                 |  97 ++++++++++
 .../aspeed,ast2700-intc1.yaml                 |  94 ++++++++++
 drivers/irqchip/Kconfig                       |   6 +
 drivers/irqchip/Makefile                      |   1 +
 drivers/irqchip/irq-aspeed-intc.c             |   2 +
 drivers/irqchip/irq-ast2700-intc.c            | 174 ++++++++++++++++++
 6 files changed, 374 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2700-intc0.yaml
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2700-intc1.yaml
 create mode 100644 drivers/irqchip/irq-ast2700-intc.c

-- 
2.34.1