linux-kernel - Re: [PATCH] clocksource/drivers/timer-mediatek: Make timer-mediatek become loadable module

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Date:   Fri, 10 Feb 2023 11:07:58 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     walter.chang@...iatek.com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        John Stultz <jstultz@...gle.com>
Cc:     wsd_upstream@...iatek.com, stanley.chu@...iatek.com,
        Chun-hung.Wu@...iatek.com, Freddy.Hsin@...iatek.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clocksource/drivers/timer-mediatek: Make timer-mediatek
 become loadable module

On 10/02/2023 11:00, walter.chang@...iatek.com wrote:
> From: Chun-Hung Wu <chun-hung.wu@...iatek.com>
> 
> This patch makes the timer-mediatek driver which can

Do not use "This commit/patch".
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> register an always-on timer as tick_broadcast_device
> on MediaTek SoCs become loadable module in GKI.

Are you planning to answer other parts of that discussion? IOW, does the
system boot fine? What's the impact of this being a module?

> 
> This patch depends on the previous patch.
> https://lore.kernel.org/lkml/20230208094813.20874-1-walter.chang@mediatek.com/T/#t

This does not belong to commit msg. What's the point of keeping it in
commit history forever?

> 
> Signed-off-by: Chun-Hung Wu <chun-hung.wu@...iatek.com>
> ---
>  drivers/clocksource/Kconfig          |  2 +-
>  drivers/clocksource/timer-mediatek.c | 43 ++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index 4469e7f555e9..41345827055b 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -472,7 +472,7 @@ config SYS_SUPPORTS_SH_CMT
>  	bool
>  
>  config MTK_TIMER
> -	bool "Mediatek timer driver" if COMPILE_TEST
> +	tristate "Mediatek timer driver"
>  	depends on HAS_IOMEM
>  	select TIMER_OF
>  	select CLKSRC_MMIO
> diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
> index d5b29fd03ca2..806044ef391c 100644
> --- a/drivers/clocksource/timer-mediatek.c
> +++ b/drivers/clocksource/timer-mediatek.c
> @@ -13,6 +13,9 @@
>  #include <linux/clocksource.h>
>  #include <linux/interrupt.h>
>  #include <linux/irqreturn.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
>  #include <linux/sched_clock.h>
>  #include <linux/slab.h>
>  #include "timer-of.h"
> @@ -450,6 +453,46 @@ static int __init mtk_gpt_init(struct device_node *node)
>  
>  	return 0;
>  }
> +
> +#ifdef MODULE
> +static int mtk_timer_probe(struct platform_device *pdev)
> +{
> +	int (*timer_init)(struct device_node *node);
> +	struct device_node *np = pdev->dev.of_node;
> +
> +	timer_init = of_device_get_match_data(&pdev->dev);
> +	return timer_init(np);
> +}
> +
> +static const struct of_device_id mtk_timer_match_table[] = {
> +	{
> +		.compatible = "mediatek,mt6577-timer",
> +		.data = mtk_gpt_init,
> +	},
> +	{
> +		.compatible = "mediatek,mt6765-timer",
> +		.data = mtk_syst_init,
> +	},
> +	{
> +		.compatible = "mediatek,mt6795-systimer",
> +		.data = mtk_cpux_init,
> +	},
> +	{}
> +};
> +
> +static struct platform_driver mtk_timer_driver = {
> +	.probe = mtk_timer_probe,
> +	.driver = {
> +		.name = "mtk-timer",
> +		.of_match_table = mtk_timer_match_table,
> +	},
> +};
> +MODULE_DESCRIPTION("MEDIATEK Module Timer driver");
> +MODULE_LICENSE("GPL v2");

I don't think you run checkpatch before sending... please do not use
humans for review which is done by automatic tools.

> +
> +module_platform_driver(mtk_timer_driver);

Follow coding convention like in very other driver, so this goes
immediately after definition of driver structure.

> +#else


Best regards,
Krzysztof