linux-kernel - Re: [PATCH v2] spi: bcm2835: Enable shared interrupt support

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Date:   Mon, 15 Jun 2020 21:48:39 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Lukas Wunner <lukas@...ner.de>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, linux-kernel@...r.kernel.org,
        "open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Martin Sperl <kernel@...tin.sperl.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: Re: [PATCH v2] spi: bcm2835: Enable shared interrupt support

On Mon, Jun 15, 2020 at 12:42:50PM -0700, Florian Fainelli wrote:

> Or how about this: we slightly re-structure the interrupt handler such
> that all possible interrupt conditions are explicitly handled and
> terminate with a return IRQ_HANDLED, and those which are not, including
> in the case of a "spurious" (because the interrupt was triggered for
> another SPI controller instance), then we finish the function with
> IRQ_NONE. This would not impact the performance for the BCM2835/36/37
> which would still have a single controller/single interrupt line to handle.

That seems sensible - it's generally a good way to structure interrupt
handlers.  It's almost there already.

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