linux-kernel - Re: [PATCH] clk: sunxi-ng: select SUNXI_CCU

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Date:   Fri, 2 Jun 2017 14:15:32 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Stephen Boyd <sboyd@...eaurora.org>, Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tobias Regnery <tobias.regnery@...il.com>,
        linux-clk@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Icenowy Zheng <icenowy@...c.io>
Subject: Re: [PATCH] clk: sunxi-ng: select SUNXI_CCU_MULT for sun8i-a83t

On Thu, Jun 01, 2017 at 11:07:46AM +0200, Arnd Bergmann wrote:
> On Thu, Jun 1, 2017 at 9:17 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> > On 05/23, Arnd Bergmann wrote:
> >> On Tue, May 23, 2017 at 9:19 AM, Chen-Yu Tsai <wens@...e.org> wrote:
> >> An alternative would be to remove all the dependencies as 'lib-y'
> >> in the Makefile and remove the individual Kconfig symbols. That
> >> way, we would always build all of them when CONFIG_SUNXI_CCU
> >> is enabled, but the linker would drop the ones that do not get
> >> referenced.
> >
> > In this case you're right, and we should change them to lib-y in
> > the Makefile and then let the linker figure this all out. No more
> > dependency patches. I think we only need to do this sort of
> > Kconfig stuff when we want to make a library .ko file that each
> > SoC specific driver depends on for common code.
> >
> > It would be cool if the build system could figure that all out
> > for us, and let us have something like modlib-y that makes it a
> > library (archive) if all objects depending on it are builtin and
> > we have CONFIG_MODULES=n, or makes it into an object file if
> > something is builtin that depends on it, or makes it into a
> > module if everything that depends on it is a module.
> 
> In this case, there are no loadable modules, the sunxi clk drivers
> can only be built-in, which should simplify the problem a lot.

Using the linker to drop the useless stuff seems like a good idea. Do
you want to send a patch for it?

Maxim

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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