linux-kernel - RE: [PATCH 1/3] gpio: mxc: Support module build

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Date:   Wed, 15 Jul 2020 02:44:00 +0000
From:   Anson Huang <anson.huang@....com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "oleksandr.suvorov@...adex.com" <oleksandr.suvorov@...adex.com>,
        Adam Ford <aford173@...il.com>,
        Andreas Kemnade <andreas@...nade.info>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Leo Li <leoyang.li@....com>, Vinod Koul <vkoul@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Olof Johansson <olof@...om.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 1/3] gpio: mxc: Support module build

Hi, Linus

> Subject: RE: [PATCH 1/3] gpio: mxc: Support module build
> 
> Hi, Linus
> 
> > Subject: Re: [PATCH 1/3] gpio: mxc: Support module build
> >
> > On Wed, Jul 8, 2020 at 1:28 AM Anson Huang <Anson.Huang@....com>
> > wrote:
> >
> > >  subsys_initcall(gpio_mxc_init);
> > > +
> > > +MODULE_AUTHOR("Shawn Guo <shawn.guo@...aro.org>");
> > > +MODULE_DESCRIPTION("i.MX GPIO Driver"); MODULE_LICENSE("GPL");
> >
> > You are making this modualrizable but keeping the subsys_initcall(),
> > which doesn't make very much sense. It is obviously not necessary to
> > do this probe at subsys_initcall() time, right?
> >
> 
> If building it as module, the subsys_initcall() will be equal to module_init(), I
> keep it unchanged is because I try to make it identical when built-in, since
> most of the config will still have it built-in, except the Android GKI support.
> Does it make sense?
> 
> > Take this opportunity to convert the driver to use
> > module_platform_driver() as well.
> 
> If you think it has to be or it is better to use module_platform_driver(), I will do
> it in V2.

I tried to replace the subsys_initcall() with module_platform_driver(), but met issue
about " register_syscore_ops(&mxc_gpio_syscore_ops);" which is called in gpio_mxc_init()
function, this function should be called ONLY once, moving it to .probe function is NOT
working, so we may need to keep the gpio_mxc_init(), that is another reason that we may
need to keep subsys_initcall()?

Thanks,
Anson