linux-kernel - Re: [PATCH 07/10] irqchip/cs42l43: Add support for the cs42l43 IRQs

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Date:   Fri, 12 May 2023 16:10:05 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     <broonie@...nel.org>, <lee@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <tglx@...utronix.de>, <linus.walleij@...aro.org>,
        <vkoul@...nel.org>, <lgirdwood@...il.com>,
        <yung-chuan.liao@...ux.intel.com>, <sanyog.r.kale@...el.com>,
        <pierre-louis.bossart@...ux.intel.com>,
        <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <devicetree@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/10] irqchip/cs42l43: Add support for the cs42l43 IRQs

On Fri, 12 May 2023 13:28:35 +0100,
Charles Keepax <ckeepax@...nsource.cirrus.com> wrote:
> 
> The CS42L43 is an audio CODEC with integrated MIPI SoundWire interface
> (Version 1.2.1 compliant), I2C, SPI, and I2S/TDM interfaces designed
> for portable applications. It provides a high dynamic range, stereo
> DAC for headphone output, two integrated Class D amplifiers for
> loudspeakers, and two ADCs for wired headset microphone input or
> stereo line input. PDM inputs are provided for digital microphones.
> 
> The IRQ chip provides IRQ functionality both to other parts of the
> cs42l43 device and to external devices that wish to use its IRQs.

Sorry, but this isn't much of an interrupt controller driver. A modern
interrupt controller driver is firmware-driven (DT or ACPI, pick your
poison), uses irq domains, and uses the irqchip API.

This is just a another variant of the board-file theme, which has
nothing to do with the irqchip subsystem.

	M.

-- 
Without deviation from the norm, progress is not possible.