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

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Date:   Thu, 1 Jun 2017 08:47:00 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        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>
Subject: Re: [PATCH] ARM: s3c64xx: don't select ARM_AMBA from S3C64XX_PL080

On 31 May 2017 at 14:25, Arnd Bergmann <arnd@...db.de> wrote:
> 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?

That was part of the initial driver submission that happened a couple
of years ago.  The driver depended on AMBA and as such I added the
"select", not knowing it was preferable to have a "depends".

>
> 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.

I'm good with that.

Mathieu

>
>         Arnd