linux-kernel - Re: [PATCH v2 2/3] platform: move the early platform device support to arch/sh

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Date:   Wed, 2 May 2018 23:01:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Peter Rosin <peda@...ntia.se>, Jiri Slaby <jslaby@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 2/3] platform: move the early platform device support
 to arch/sh

Hi Bartosz,

On Wed, May 2, 2018 at 11:48 AM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> SuperH is the only user of the current implementation of early platform
> device support. We want to introduce a more robust approach to early
> probing. As the first step - move all the current early platform code
> to arch/sh.
>
> In order not to export internal drivers/base functions to arch code for
> this temporary solution - copy the two needed routines for driver
> matching from drivers/base/platform.c to arch/sh/drivers/platform_early.c.
>
> Also: call early_platform_cleanup() from subsys_initcall() so that it's
> called after all early devices are probed.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>

Thanks for your patch!

> --- a/drivers/clocksource/sh_cmt.c
> +++ b/drivers/clocksource/sh_cmt.c

> @@ -1043,10 +1047,12 @@ static int sh_cmt_probe(struct platform_device *pdev)
>         struct sh_cmt_device *cmt = platform_get_drvdata(pdev);
>         int ret;
>
> +#ifdef CONFIG_SUPERH
>         if (!is_early_platform_device(pdev)) {
>                 pm_runtime_set_active(&pdev->dev);
>                 pm_runtime_enable(&pdev->dev);
>         }
> +#endif

I think the above is not correct: on ARM/ARM64, is_early_platform_device()
used to return false, so the pm_runtime_*() functions must be called.

Perhaps you should keep a dummy is_early_platform_device(), always
returning false on !SUPERH? That would reduce the number of #ifdefs you
have to add, too.

> --- a/drivers/clocksource/sh_mtu2.c
> +++ b/drivers/clocksource/sh_mtu2.c
> @@ -450,10 +454,12 @@ static int sh_mtu2_probe(struct platform_device *pdev)
>         struct sh_mtu2_device *mtu = platform_get_drvdata(pdev);
>         int ret;
>
> +#ifdef CONFIG_SUPERH
>         if (!is_early_platform_device(pdev)) {
>                 pm_runtime_set_active(&pdev->dev);
>                 pm_runtime_enable(&pdev->dev);
>         }
> +#endif

Likewise.

> --- a/drivers/clocksource/sh_tmu.c
> +++ b/drivers/clocksource/sh_tmu.c
> @@ -606,10 +610,12 @@ static int sh_tmu_probe(struct platform_device *pdev)
>         struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
>         int ret;
>
> +#ifdef CONFIG_SUPERH
>         if (!is_early_platform_device(pdev)) {
>                 pm_runtime_set_active(&pdev->dev);
>                 pm_runtime_enable(&pdev->dev);
>         }
> +#endif

Likewise.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds