linux-kernel - Re: [PATCH] ARM: s3c64xx: don't select ARM_AMBA from S3C64XX

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Date:   Wed, 31 May 2017 22:25:02 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Eric Anholt <eric@...olt.net>,
        "moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH] ARM: s3c64xx: don't select ARM_AMBA from S3C64XX_PL080

On Wed, May 31, 2017 at 9:58 PM, Russell King - ARM Linux
<linux@...linux.org.uk> wrote:
> On Wed, May 24, 2017 at 05:58:34PM +0200, Arnd Bergmann wrote:
> Yes, selecting ARM_AMBA from drivers is definitely not right; this
> symbol should be selected only by platforms that want AMBA primecell
> bus support, not by drivers, precisely because of these dependency
> issues.
>
> There's another case where ARM_AMBA is selected that probably needs
> fixing - the coresight hwtracing code.

[Adding Mathieu to cc]

Mathieu,

do you remember how we ended up with this?

menuconfig CORESIGHT
       bool "CoreSight Tracing Support"
       select ARM_AMBA

As Russell says, probably shouldn't select that symbol, most likely
we want either the individual drivers that register an amba_driver to have
a 'depends on ARM_AMBA' or alternatively replace the 'select' with 'depends
on' for the entire subsystem.

        Arnd