linux-kernel - Re: [PATCH v3 6/9] kbuild: consolidate Devicetree dtb build rules

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Date:   Fri, 28 Sep 2018 19:21:45 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        H8/300 ARCHITECTURE <uclinux-h8-devel@...ts.sourceforge.jp>,
        Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
        nios2-dev@...ts.rocketboards.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-xtensa@...ux-xtensa.org, Will Deacon <will.deacon@....com>,
        Paul Burton <paul.burton@...s.com>, ley.foon.tan@...el.com
Subject: Re: [PATCH v3 6/9] kbuild: consolidate Devicetree dtb build rules

Hi Geert,

Am 13.09.18 um 17:51 schrieb Geert Uytterhoeven:
> On Wed, Sep 12, 2018 at 3:02 AM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
>> Even x86 can enable OF and OF_UNITTEST.
>>
>> Another solution might be,
>> guard it by 'depends on ARCH_SUPPORTS_OF'.
>>
>> This is actually what ACPI does.
>>
>> menuconfig ACPI
>>         bool "ACPI (Advanced Configuration and Power Interface) Support"
>>         depends on ARCH_SUPPORTS_ACPI
>>          ...
> 
> ACPI is a real platform feature, as it depends on firmware.
> 
> CONFIG_OF can be enabled, and DT overlays can be loaded, on any platform,
> even if it has ACPI ;-)

How would loading a DT overlay work on an ACPI platform? I.e., what
would it overlay against and how to practically load such a file?

I wonder whether that could be helpful for USB devices and serdev...

Cheers,
Andreas

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