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

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Message-ID: <47dcce5a-f438-9f12-5b60-651dc5f2b92c@linaro.org>
Date:   Fri, 13 Aug 2021 18:00:00 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Chunyan Zhang <zhang.lyra@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     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

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 ?

>  {
>  	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.

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



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