linux-kernel - Re: [PATCH 07/11] iommu/apple-dart: Drop default ARCH

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Message-ID: <7ffe2c8a-1433-4adf-9786-ee0a9d2f3867@arm.com>
Date: Fri, 13 Jun 2025 17:55:52 +0100
From: Robin Murphy <robin.murphy@....com>
To: Sven Peter <sven@...nel.org>, Janne Grunau <j@...nau.net>,
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>,
 Ulf Hansson <ulf.hansson@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Srinivas Kandagatla <srini@...nel.org>,
 Andi Shyti <andi.shyti@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Vinod Koul <vkoul@...nel.org>, Martin Povišer
 <povik+lin@...ebit.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Arnd Bergmann <arnd@...db.de>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-i2c@...r.kernel.org, iommu@...ts.linux.dev,
 linux-input@...r.kernel.org, dmaengine@...r.kernel.org,
 linux-sound@...r.kernel.org
Subject: Re: [PATCH 07/11] iommu/apple-dart: Drop default ARCH_APPLE in
 Kconfig

On 2025-06-12 10:11 pm, Sven Peter wrote:
> When the first driver for Apple Silicon was upstreamed we accidentally
> included `default ARCH_APPLE` in its Kconfig which then spread to almost
> every subsequent driver. As soon as ARCH_APPLE is set to y this will
> pull in many drivers as built-ins which is not what we want.
> Thus, drop `default ARCH_APPLE` from Kconfig.

Acked-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Sven Peter <sven@...nel.org>
> ---
>   drivers/iommu/Kconfig | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index 0a33d995d15dd759eb47705c00b411f1157b408a..91d0c871acc418ac5fede4f177ce3af97aef5560 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -305,7 +305,6 @@ config APPLE_DART
>   	depends on !GENERIC_ATOMIC64	# for IOMMU_IO_PGTABLE_DART
>   	select IOMMU_API
>   	select IOMMU_IO_PGTABLE_DART
> -	default ARCH_APPLE
>   	help
>   	  Support for Apple DART (Device Address Resolution Table) IOMMUs
>   	  found in Apple ARM SoCs like the M1.
>