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Tue, 5 Aug 2025 15:39:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754408351; bh=Sfc3xMxHGqVoflK676SStVZbw5uDGyunMmKEB2eOesM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=tvLIBxj8IsgIX41sw53OtzX3fdSThyLyVyGhoI1inGTzM5sMCj5lU9fDrUeBDXkUd aKZd4ZF2s2RWT+H3CnkZFF+w7jF7GgHW8UBtprj+4UVk4Zk5LBFJVwPdVcgFwgu5zA DpVn4bKnqDeuI7G9lSY1QVAjN4L7LkdnISkvQFOJjJbXhC1ONbkAwrSnfCWkiZScoI b7dJkTlw1a8merA/t75DOoawK+KnPSH6o12t33UxdV/RJyve4f8cHuGdKPqdxIuoTB 0q99GD1EaJ7h6gVRa3dku3gsRFpk3Ba0r0dmdriLLPz/mcuSQ9C5s+4BJ+JjuyfwFK mPLUnqRSi/iSg== Date: Tue, 5 Aug 2025 10:39:08 -0500 From: Rob Herring To: Ryan Chen Cc: Eddie James , Thomas Gleixner , Krzysztof Kozlowski , Conor Dooley , Joel Stanley , Andrew Jeffery , linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/2] irqchip/aspeed-scu-ic: Add support for AST2700 SCU interrupt controllers Message-ID: <20250805153908.GA1807801-robh@kernel.org> References: <20250804053445.1482749-1-ryan_chen@aspeedtech.com> <20250804053445.1482749-3-ryan_chen@aspeedtech.com> X-Mailing-List: linux-aspeed@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250804053445.1482749-3-ryan_chen@aspeedtech.com> On Mon, Aug 04, 2025 at 01:34:45PM +0800, Ryan Chen wrote: > The AST2700 SoC follows the multi-instance interrupt controller architecture > introduced in the AST2600, where each SCU interrupt group (IC0–IC3) is treated > as an independent interrupt domain. > > Unlike the AST2600, which uses a combined register for interrupt enable and > status bits, the AST2700 separates these into distinct registers: one for > interrupt enable (IER) and another for interrupt status (ISR). This architectural > change requires explicit handling of split registers for interrupt control. > > - Register definitions and configuration for AST2700 SCU IC instances > (compatible: aspeed,ast2700-scu-ic0/1/2/3) > - Initialization logic for handling split IER/ISR registers > - Chained IRQ handling and mask/unmask logic > - Table-driven registration using IRQCHIP_DECLARE per compatible > > Signed-off-by: Ryan Chen > --- > drivers/irqchip/irq-aspeed-scu-ic.c | 240 ++++++++++++++++++++++------ > 1 file changed, 195 insertions(+), 45 deletions(-) > > diff --git a/drivers/irqchip/irq-aspeed-scu-ic.c b/drivers/irqchip/irq-aspeed-scu-ic.c > index 1c7045467c48..b6f3ba269c5b 100644 > --- a/drivers/irqchip/irq-aspeed-scu-ic.c > +++ b/drivers/irqchip/irq-aspeed-scu-ic.c > @@ -1,6 +1,6 @@ > // SPDX-License-Identifier: GPL-2.0-or-later > /* > - * Aspeed AST24XX, AST25XX, and AST26XX SCU Interrupt Controller > + * Aspeed AST24XX, AST25XX, AST26XX, AST27XX SCU Interrupt Controller > * Copyright 2019 IBM Corporation > * > * Eddie James > @@ -34,11 +34,42 @@ > GENMASK(5, ASPEED_AST2600_SCU_IC1_SHIFT) > #define ASPEED_AST2600_SCU_IC1_NUM_IRQS 2 > > +#define ASPEED_AST2700_SCU_IC0_EN_REG 0x1d0 > +#define ASPEED_AST2700_SCU_IC0_STS_REG 0x1d4 > +#define ASPEED_AST2700_SCU_IC0_SHIFT 0 > +#define ASPEED_AST2700_SCU_IC0_ENABLE \ > + GENMASK(3, ASPEED_AST2700_SCU_IC0_SHIFT) > +#define ASPEED_AST2700_SCU_IC0_NUM_IRQS 4 > + > +#define ASPEED_AST2700_SCU_IC1_EN_REG 0x1e0 > +#define ASPEED_AST2700_SCU_IC1_STS_REG 0x1e4 > +#define ASPEED_AST2700_SCU_IC1_SHIFT 0 > +#define ASPEED_AST2700_SCU_IC1_ENABLE \ > + GENMASK(3, ASPEED_AST2700_SCU_IC1_SHIFT) > +#define ASPEED_AST2700_SCU_IC1_NUM_IRQS 4 > + > +#define ASPEED_AST2700_SCU_IC2_EN_REG 0x104 > +#define ASPEED_AST2700_SCU_IC2_STS_REG 0x100 > +#define ASPEED_AST2700_SCU_IC2_SHIFT 0 > +#define ASPEED_AST2700_SCU_IC2_ENABLE \ > + GENMASK(3, ASPEED_AST2700_SCU_IC2_SHIFT) > +#define ASPEED_AST2700_SCU_IC2_NUM_IRQS 4 > + > +#define ASPEED_AST2700_SCU_IC3_EN_REG 0x10c > +#define ASPEED_AST2700_SCU_IC3_STS_REG 0x108 > +#define ASPEED_AST2700_SCU_IC3_SHIFT 0 > +#define ASPEED_AST2700_SCU_IC3_ENABLE \ > + GENMASK(1, ASPEED_AST2700_SCU_IC3_SHIFT) > +#define ASPEED_AST2700_SCU_IC3_NUM_IRQS 2 > + The reason for ic0/ic1 compatibles before was the enable field was different. Now it's at least at the same shift. Do you really need a different value for IC3? The register addresses should come from "reg". I don't understand why they are hardcoded in the driver. Rob