linux-kernel - Re: [PATCH v2 3/3] clocksource/drivers/sprd: Add module support to Unisoc timer

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Date:   Fri, 20 Aug 2021 15:46:22 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Saravana Kannan <saravanak@...gle.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] clocksource/drivers/sprd: Add module support to
 Unisoc timer

Hi Daniel,

On Sat, 14 Aug 2021 at 00:00, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> On 15/07/2021 08:54, Chunyan Zhang wrote:
> > From: Chunyan Zhang <chunyan.zhang@...soc.com>
> >
> > Timers still have devices created for them. So, when compiling a timer
> > driver as a module, implement it as a normal platform device driver.
> >
> > Original-by: Baolin Wang <baolin.wang7@...il.com>
> > Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
> > ---
> >  drivers/clocksource/Kconfig      |  2 +-
> >  drivers/clocksource/timer-sprd.c | 15 ++++++++++-----
> >  2 files changed, 11 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> > index eb661b539a3e..a5a5b7c883ec 100644
> > --- a/drivers/clocksource/Kconfig
> > +++ b/drivers/clocksource/Kconfig
> > @@ -461,7 +461,7 @@ config MTK_TIMER
> >         Support for Mediatek timer driver.
> >
> >  config SPRD_TIMER
> > -     bool "Spreadtrum timer driver" if EXPERT
> > +     tristate "Spreadtrum timer driver" if EXPERT
> >       depends on HAS_IOMEM
> >       depends on (ARCH_SPRD || COMPILE_TEST)
> >       default ARCH_SPRD
> > diff --git a/drivers/clocksource/timer-sprd.c b/drivers/clocksource/timer-sprd.c
> > index 430cb99d8d79..a8a7d3ea3464 100644
> > --- a/drivers/clocksource/timer-sprd.c
> > +++ b/drivers/clocksource/timer-sprd.c
> > @@ -5,6 +5,8 @@
> >
> >  #include <linux/init.h>
> >  #include <linux/interrupt.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> >
> >  #include "timer-of.h"
> >
> > @@ -141,7 +143,7 @@ static struct timer_of to = {
> >       },
> >  };
> >
> > -static int __init sprd_timer_init(struct device_node *np)
> > +static int sprd_timer_init(struct device_node *np)
>
> Does the __init annotation really need to be removed ?

Yes, since sprd_timer_init() would be invoked by
platform_timer_probe() which seems not able to be marked as __init.

>
> >  {
> >       int ret;
> >
> > @@ -190,7 +192,7 @@ static struct clocksource suspend_clocksource = {
> >       .flags  = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,
> >  };
> >
> > -static int __init sprd_suspend_timer_init(struct device_node *np)
> > +static int sprd_suspend_timer_init(struct device_node *np)
> >  {
> >       int ret;
> >
> > @@ -204,6 +206,9 @@ static int __init sprd_suspend_timer_init(struct device_node *np)
> >       return 0;
> >  }
> >
> > -TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init);
> > -TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-suspend-timer",
> > -              sprd_suspend_timer_init);
> > +TIMER_PLATFORM_DRIVER_BEGIN(sprd_timer)
> > +TIMER_MATCH("sprd,sc9860-timer", sprd_timer_init)
> > +TIMER_MATCH("sprd,sc9860-suspend-timer", sprd_suspend_timer_init)
> > +TIMER_PLATFORM_DRIVER_END(sprd_timer);
>
> Please replace the above by something like:
>
> TIMER_PLATFORM_DECLARE(sc9860_timer,
>                         "sprd,sc9860-timer",
>                         sprd_timer_init);
>
> TIMER_PLATFORM_DECLARE(sc9860_persistent_timer,
>                         "sprd,sc9860-suspend-timer",
>                         sprd_suspend_timer_init);
>
> Without TIMER_PLATFORM_DRIVER_BEGIN/END, and if possible the
> MODULE_DESCRIPTION/LICENSE in the TIMER_PLATFORM_DECLARE macro itself.
> The module description could be the first argument of the timer platform
> declaration.

I hope I got your point, will address this in the next version.
Let's see if changes are what you want then.

Thanks for your review,
Chunyan


>
> > +MODULE_DESCRIPTION("Unisoc broadcast timer module");
> > +MODULE_LICENSE("GPL");
>
>
>
> --
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