linux-kernel - Re: [PATCH 2/2] [RFC] base: soc: Allow early registration of a single SoC device

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Message-ID: <CAK8P3a38KKHF5c2gy7b6uLJv08HqoDViAF-VVTThmNgAdJaU2Q@mail.gmail.com>
Date:   Mon, 13 Mar 2017 14:06:37 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] [RFC] base: soc: Allow early registration of a single
 SoC device

On Mon, Mar 13, 2017 at 1:46 PM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Mon, Mar 13, 2017 at 1:41 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> On Thu, Mar 9, 2017 at 7:18 PM, Geert Uytterhoeven
>>
>> I'd prefer to not have to do the early registration at all and have fewer
>> special cases. Can you list a specific example that requires this?
>
> The specific example is the Renesas R-Car SYSC driver, which manages PM
> Domains and thus needs to be initialized from an early_initcall.

Ok, and what prevents us from using information in DT to detect which
variant we have? Is this a case of absolutely having to know the exact
hardware revision at the time of initialization, or is it just to simplify the
implementation of the SYSC driver?

     Arnd