linux-kernel - Re: [PATCH v2 04/15] ARM: milbeaut: Add basic support for Milbeaut m10v SoC

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Date:   Tue, 19 Feb 2019 10:21:01 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Sugaya, Taichi" <sugaya.taichi@...ionext.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shinji Kanematsu <kanematsu.shinji@...ionext.com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Takao Orito <orito.takao@...ionext.com>,
        Kazuhiro Kasai <kasai.kazuhiro@...ionext.com>
Subject: Re: [PATCH v2 04/15] ARM: milbeaut: Add basic support for Milbeaut
 m10v SoC

On Tue, Feb 19, 2019 at 8:12 AM Sugaya, Taichi
<sugaya.taichi@...ionext.com> wrote:
> On 2019/02/18 21:15, Arnd Bergmann wrote:
> > On Fri, Feb 8, 2019 at 1:26 PM Sugaya Taichi
> > <sugaya.taichi@...ionext.com> wrote:
>
> >> +static int __init m10v_pm_init(void)
> >> +{
> >> +       suspend_set_ops(&m10v_pm_ops);
> >> +
> >> +       return 0;
> >> +}
> >> +late_initcall(m10v_pm_init);
> >
> > This requires a check to ensure you are actually on the right platform,
> > otherwise you break suspend/resume in a multiplatform kernel running
> > on anything other than milbeaut.
> >
>
> OK.
> I think the solution is adding a "if statement with mlbeaut compatible"
> above suspend_set_ops(&m10v_pm_ops).

Right, you can either use a call to of_machine_is_compatible(),
or you add a machine descriptor with OF_MACHINE_START()
and use this as the init_late() callback.

      Arnd