linux-kernel - Re: [PATCH 3/4] arm64: Kconfig: Fix VEXPRESS driver dependencies

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Date:   Fri, 20 Sep 2019 13:12:09 -0700
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lists LAKML <linux-arm-kernel@...ts.infradead.org>,
        arm-soc <arm@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Sebastian Reichel <sre@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Will Deacon <will@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 3/4] arm64: Kconfig: Fix VEXPRESS driver dependencies

On Fri, Sep 13, 2019 at 3:12 AM Sudeep Holla <sudeep.holla@....com> wrote:
>
> On Thu, Sep 12, 2019 at 03:48:47AM +0530, Amit Kucheria wrote:
> > Push various VEXPRESS drivers behind ARCH_VEXPRESS dependency so that it
> > doesn't get enabled by default on other platforms.
> >
>
> I couldn't understand the motivation for these changes from the cover letter.

Yes, the cover letter for this series needs to be a lot better. Sorry.
In summary, I found a bunch of drivers in defconfig that were getting
called in early_initcall and core_initcall even when the platform or
COMPILE_TEST was not enabled. So I was just trying to ring fence some
of those drivers as a proof of concept to see if these changes were
acceptable upstream.

Let me try again with a better cover letter and using the pattern Arnd
suggested elsewhere.

> > Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> > ---
> >  drivers/bus/Kconfig           | 2 +-
> >  drivers/clk/versatile/Kconfig | 4 ++--
> >  2 files changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
> > index d80e8d70bf10..b2b1beee9953 100644
> > --- a/drivers/bus/Kconfig
> > +++ b/drivers/bus/Kconfig
> > @@ -166,7 +166,7 @@ config UNIPHIER_SYSTEM_BUS
> >
> >  config VEXPRESS_CONFIG
> >       bool "Versatile Express configuration bus"
> > -     default y if ARCH_VEXPRESS
> > +     depends on ARCH_VEXPRESS
> >       depends on ARM || ARM64
> >       depends on OF
> >       select REGMAP
> > diff --git a/drivers/clk/versatile/Kconfig b/drivers/clk/versatile/Kconfig
> > index ac766855ba16..826750292c1e 100644
> > --- a/drivers/clk/versatile/Kconfig
> > +++ b/drivers/clk/versatile/Kconfig
> > @@ -5,8 +5,8 @@ config ICST
> >  config COMMON_CLK_VERSATILE
> >       bool "Clock driver for ARM Reference designs"
> >       depends on ARCH_INTEGRATOR || ARCH_REALVIEW || \
> > -             ARCH_VERSATILE || ARCH_VEXPRESS || ARM64 || \
> > -             COMPILE_TEST
> > +             ARCH_VERSATILE || ARCH_VEXPRESS || COMPILE_TEST
> > +     depends on ARM64
>
> This will break 32-bit platforms.
>
> --
> Regards,
> Sudeep