linux-kernel - Re: [PATCHv2] drivers: bus: simple-pm-bus: Fix compatibility with simple-bus for auxdata

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Date:   Mon, 18 Jan 2021 09:03:33 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     ext Tony Lindgren <tony@...mide.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        <linux-omap@...r.kernel.org>
Subject: Re: [PATCHv2] drivers: bus: simple-pm-bus: Fix compatibility with
 simple-bus for auxdata

On Mon, Jan 18, 2021 at 8:33 AM Tony Lindgren <tony@...mide.com> wrote:
> After converting am335x to probe devices with simple-pm-bus I noticed
> that we are not passing auxdata for of_platform_populate() like we do
> with simple-bus.
>
> While device tree using SoCs should no longer need platform data, there
> are still quite a few drivers that still need it as can be seen with
> git grep OF_DEV_AUXDATA. We want to have simple-pm-bus be usable as a
> replacement for simple-bus also for cases where OF_DEV_AUXDATA is still
> needed.
>
> Let's fix the issue by passing auxdata as platform data to simple-pm-bus.
> That way the SoCs needing this can pass the auxdata with OF_DEV_AUXDATA.
> And let's pass the auxdata for omaps to fix the issue for am335x.
>
> As an alternative solution, adding simple-pm-bus handling directly to
> drivers/of/platform.c was considered, but we would still need simple-pm-bus
> device driver. So passing auxdata as platform data seems like the simplest
> solution.
>
> Fixes: 5a230524f879 ("ARM: dts: Use simple-pm-bus for genpd for am3 l4_wkup")
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>

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