linux-kernel - Re: [PATCH 2/2] m68k: rtc: dp8570a: make it a proper RTC class driver

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Message-ID: <CAMuHMdW_13wOxD0Q0PVCUXBwC9y8iKXTcwH=m5tvX856S9ZU1w@mail.gmail.com>
Date: Thu, 27 Feb 2025 12:05:26 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, linux-rtc@...r.kernel.org, 
	kernel-dev@...lia.com
Subject: Re: [PATCH 2/2] m68k: rtc: dp8570a: make it a proper RTC class driver

Hi Thadeu,

On Wed, 26 Feb 2025 at 13:27, Thadeu Lima de Souza Cascardo
<cascardo@...lia.com> wrote:
> In the past, each rtc implementation had to rewrite the same ioctls in
> order to be compatible. But since 2006, a common RTC interface has been
> introduced. Use it for the last user of RTC_MINOR.
>
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>

Thanks for your patch!

> --- a/arch/m68k/bvme6000/rtc.c
> +++ b/arch/m68k/bvme6000/rtc.c

>
>  static int __init rtc_DP8570A_init(void)
>  {
> +       struct platform_device *pdev;
> +
>         if (!MACH_IS_BVME6000)
>                 return -ENODEV;
>
>         pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
> -       return misc_register(&rtc_dev);
> +
> +       pdev = platform_device_register_data(NULL, "rtc-generic", -1,
> +                                            &dp8570a_rtc_ops,
> +                                            sizeof(dp8570a_rtc_ops));

Doesn't this conflict with the creation of the same device in rtc_init()[1]?

On BVME6000, mach_hwclk is set:

    arch/m68k/bvme6000/config.c:    mach_hwclk           = bvme6000_hwclk;

> +
> +       return PTR_ERR_OR_ZERO(pdev);
>  }
>  module_init(rtc_DP8570A_init);

[1] https://elixir.bootlin.com/linux/v6.13.4/source/arch/m68k/kernel/time.c#L144

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