linux-kernel - Re: [PATCH 0/3] irqchip: atmel-aic: Add irq RTC fixups

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Message-ID: <20140710203249.23dd6444@bbrezillon>
Date:	Thu, 10 Jul 2014 20:32:49 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] irqchip: atmel-aic: Add irq RTC fixups

On Thu, 10 Jul 2014 20:25:38 +0200
Boris BREZILLON <boris.brezillon@...e-electrons.com> wrote:

> Hello,
> 
> This patch series introduce the notion of irq fixups for atmel SoCs.
> 
> In most at91 SoCs the first interrupt line is shared by several IPs, and
> some of these HW blocks might be in an unknown state when booting the
> Linux kernel.
> Hence these IPs might generate spurious interrupts if they've not masked
> their irqs and the shared irq line is requested by another peripheral.
> 
> These fixups were previously done in arch/arm/mach-at91/sysirq_mask.c
> but as we're trying to use standard implementation (IRQCHIP_DECLARE and
> automatic call of irqchip_init within arch/arm/kernel/irq.c) we need to
> do those fixups in the irqchip driver.

This is what I was talking about:

http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/271425.htm


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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