linux-kernel - Re: [PATCH] power: reset: nvmem-reboot-mode: add CONFIG

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Message-ID: <CAK8P3a2_UtCDGG0qtTyTAADh4BoErS_q0PBMGmZ7UUHrQ9Y2ww@mail.gmail.com>
Date:   Mon, 5 Aug 2019 09:48:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Nandor Han <nandor.han@...sala.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] power: reset: nvmem-reboot-mode: add CONFIG_OF dependency

On Mon, Aug 5, 2019 at 9:10 AM Nandor Han <nandor.han@...sala.com> wrote:
>
> On 7/8/19 3:52 PM, Arnd Bergmann wrote:
> > Without CONFIG_OF, we get a build failure in the reboot-mode
> > implementation:
> >
> > drivers/power/reset/reboot-mode.c: In function 'reboot_mode_register':
> > drivers/power/reset/reboot-mode.c:72:2: error: implicit declaration of function 'for_each_property_of_node'; did you mean 'for_each_child_of_node'? [-Werror=implicit-function-declaration]
> >    for_each_property_of_node(np, prop) {
> >
> > Add a Kconfig dependency like we have for the other users of
> > CONFIG_REBOOT_MODE.
> >
> > Fixes: 7a78a7f7695b ("power: reset: nvmem-reboot-mode: use NVMEM as reboot mode write interface")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >   drivers/power/reset/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> > index 8dfb105db391..a564237278ff 100644
> > --- a/drivers/power/reset/Kconfig
> > +++ b/drivers/power/reset/Kconfig
> > @@ -248,6 +248,7 @@ config POWER_RESET_SC27XX
> >
> >   config NVMEM_REBOOT_MODE
> >       tristate "Generic NVMEM reboot mode driver"
> > +     depends on OF
> >       select REBOOT_MODE
> >       help
> >         Say y here will enable reboot mode driver. This will
> >
>
> Wouldn't this be more appropriate to add the "depends on OF" to "config
> REBOOT_MODE" section, since this is an error to `reboot-mode.c` unit?

It's too late for 5.3-stable now, as that would break existing configurations
that won't select REBOOT_MODE themselves, and it adds a bit of complexity,
but we could to it for 5.4 if you think that is necessary.

       Arnd