linux-kernel - Re: [PATCH] clk: mediatek: adjust dependency of reset.c to avoid unexpectedly being built

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Message-ID: <20171227181903.GD7997@codeaurora.org>
Date:   Wed, 27 Dec 2017 10:19:03 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Sean Wang <sean.wang@...iatek.com>
Cc:     mturquette@...libre.com, matthias.bgg@...il.com, jdelvare@...e.de,
        jamesjj.liao@...iatek.com, weiyi.lu@...iatek.com,
        kevin-cw.chen@...iatek.com, shunli.wang@...iatek.com,
        chen.zhong@...iatek.com, arnd@...db.de,
        linux-mediatek@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: mediatek: adjust dependency of reset.c to avoid
 unexpectedly being built

On 12/27, Sean Wang wrote:
> On Tue, 2017-12-26 at 17:19 -0800, Stephen Boyd wrote:
> > On 12/26, sean.wang@...iatek.com wrote:
> > > From: Sean Wang <sean.wang@...iatek.com>
> > > 
> > > commit 74cb0d6dde8 ("clk: mediatek: fixup test-building of MediaTek clock
> > > drivers") can let the build system looking into the directory where the
> > > clock drivers resides and then allow test-building the drivers.
> > > 
> > > But the change also gives rise to certain incorrect behavior which is
> > > reset.c being built even not depending on either COMPILE_TEST or
> > > ARCH_MEDIATEK alternative dependency. To get rid of reset.c being built
> > > unexpectedly on the other platforms, it would be a good change that the
> > > file should be built depending on its own specific configuration rather
> > > than just on generic RESET_CONTROLLER one.
> > > 
> > > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > > Cc: Jean Delvare <jdelvare@...e.de>
> > 
> > I've typically seen vendor Kconfigs select the RESET_CONTROLLER
> > framework if the vendor Kconfig is enabled. Any reason that same
> > method isn't followed here?
> > 
> 
> I just thought explicit dependency added in Kconfig seems a little good
> no matter how the vendor Kconfig forces to select.
> 
> But, I believe reset controller is always present on every mediatek SoC,
> at least it can be found on infracfg and pericfg subsystem, which is
> really fundamental hardware block. So, it's still quite reasonable to
> add "RESET_CONTROLLER" to vendor Kconfig.
> 
> Once we did it in vendor Kconfig, the Kconfig maybe could become
> something like that.
> 
> config RESET_MEDIATEK
>        bool "MediaTek Reset Driver"
>        depends on ARCH_MEDIATEK || (RESET_CONTROLLER && COMPILE_TEST)
>        help
>          This enables the reset controller driver used on MediaTek SoCs.
> 
> where COMPILE_TEST still has to depend on RESET_CONTROLLER to avoid any
> compiling error.
> 

Why can't we have 'select RESET_CONTROLLER' under
COMMON_CLK_MEDIATEK? Is there something that RESET_CONTROLLER
depends on that may not be enabled?

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