linux-kernel - Re: [PATCH] gpio: davinci: add support of module build

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Date:   Mon, 7 Nov 2022 16:14:08 +0100
From:   Nicolas Frayer <nfrayer@...libre.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     j-keerthy@...com, linus.walleij@...aro.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        khilman@...libre.com, glaroque@...libre.com
Subject: Re: [PATCH] gpio: davinci: add support of module build

Le lun. 7 nov. 2022 à 10:14, Bartosz Golaszewski <brgl@...ev.pl> a écrit :
>
> On Wed, Oct 26, 2022 at 10:35 PM Nicolas Frayer <nfrayer@...libre.com> wrote:
> >
> > From: Guillaume La Roque <glaroque@...libre.com>
> >
> > Added module build support for the davinci gpio driver
> >
> > Signed-off-by: Guillaume La Roque <glaroque@...libre.com>
> > Signed-off-by: Nicolas Frayer <nfrayer@...libre.com>
> > ---
> >  drivers/gpio/Kconfig        |  2 +-
> >  drivers/gpio/gpio-davinci.c | 15 ++++++---------
> >  2 files changed, 7 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index a01af1180616..f8bace51c2d0 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -219,7 +219,7 @@ config GPIO_CLPS711X
> >           Say yes here to support GPIO on CLPS711X SoCs.
> >
> >  config GPIO_DAVINCI
> > -       bool "TI Davinci/Keystone GPIO support"
> > +       tristate "TI Davinci/Keystone GPIO support"
> >         default y if ARCH_DAVINCI
> >         depends on (ARM || ARM64) && (ARCH_DAVINCI || ARCH_KEYSTONE || ARCH_K3)
> >         help
> > diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
> > index 59c4c48d8296..def87b99691f 100644
> > --- a/drivers/gpio/gpio-davinci.c
> > +++ b/drivers/gpio/gpio-davinci.c
> > @@ -721,12 +721,9 @@ static struct platform_driver davinci_gpio_driver = {
> >         },
> >  };
> >
> > -/**
> > - * GPIO driver registration needs to be done before machine_init functions
> > - * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall.
> > - */
> > -static int __init davinci_gpio_drv_reg(void)
> > -{
> > -       return platform_driver_register(&davinci_gpio_driver);
> > -}
> > -postcore_initcall(davinci_gpio_drv_reg);
> > +module_platform_driver(davinci_gpio_driver);
>
> I'm sure there was a reason to register the driver early (at postcore)
> for some platforms. This moves the registration to module_init which
> is the last initcall to call. What HW did you test this on?
>
> Bart
>

You are right, I'll send a v2 keeping postcore_initcall.
I've tested on a AM62x SK EVM.

Thanks.

> > +
> > +MODULE_AUTHOR("Jan Kotas <jank@...ence.com>");
> > +MODULE_DESCRIPTION("DAVINCI GPIO driver");
> > +MODULE_LICENSE("GPL");
> > +MODULE_ALIAS("platform:gpio-davinci");
> > --
> > 2.25.1
> >