linux-kernel - Re: [PATCH v2 06/16] clk: starfive: Add JH7100 clock generator driver

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Message-ID: <YXkq27y50bVTcwhF@smile.fi.intel.com>
Date:   Wed, 27 Oct 2021 13:32:59 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Emil Renner Berthing <kernel@...il.dk>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Drew Fustini <drew@...gleboard.org>,
        Michael Zhu <michael.zhu@...rfivetech.com>,
        Fu Wei <tekkamanninja@...il.com>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/16] clk: starfive: Add JH7100 clock generator driver

On Wed, Oct 27, 2021 at 12:24:07PM +0200, Emil Renner Berthing wrote:
> On Wed, 27 Oct 2021 at 02:54, Stephen Boyd <sboyd@...nel.org> wrote:
> > Quoting Emil Renner Berthing (2021-10-26 15:35:36)
> > > On Tue, 26 Oct 2021 at 22:20, Stephen Boyd <sboyd@...nel.org> wrote:
> > > > Quoting Emil Renner Berthing (2021-10-21 10:42:13)

...

> > > > > +static int __init clk_starfive_jh7100_probe(struct platform_device *pdev)
> > > >
> > > > Drop __init as this can be called after kernel init is over.
> > >
> > > Oh interesting, I'd like to know when that can happen. The comment for
> > > the builtin_platform_driver macro says it's just a wrapper for
> >
> > I thought this was using module_platform_driver() macro?
> >
> > > device_initcall.
> > >
> > > Won't we then need to remove all the __initconst tags too since the
> > > probe function walks through jh7100_clk_data which eventually
> > > references all __initconst data?
> >
> > Yes. If it's builtin_platform_driver() it can't be a module/tristate
> > Kconfig, in which case all the init markings can stay.
> 
> Yes, it's already bool in the Kconfig file. After looking into this I
> think it's better to do like the rockchip drivers and use
> builtin_platform_driver_probe to make sure the probe function only
> called at kernel init time:
> 
> static struct platform_driver clk_starfive_jh7100_driver = {
>         .driver = {
>                 .name = "clk-starfive-jh7100",
>                 .of_match_table = clk_starfive_jh7100_match,
>                 .suppress_bind_attrs = true,
>         },
> };
> builtin_platform_driver_probe(clk_starfive_jh7100_driver,
> clk_starfive_jh7100_probe);
> 
> @Andy: is the supress_bind_attrs what you were asking about?

Clever chap! :-)
Yes, that's what I have in mind.

...

> > If it's never going to be a module then don't add any module_* things.
> 
> So does that just mean no MODULE_DEVICE_TABLE or should I also remove
> MODULE_DESCRIPTION, MODULE_AUTHOR and MODULE_LICENSE? I'm just double
> checking because the rockchip drivers seem to have MODULE_DESCRIPTION
> and MODULE_LICENSE lines.

You may comment them out. Convert them to comments or so.
But in general yes, they are no-ops in such case.

-- 
With Best Regards,
Andy Shevchenko