linux-kernel - Re: [PATCH 2/5] pinctrl: rockchip: make driver be tristate module

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Date:   Sat, 12 Sep 2020 13:41:17 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     linus.walleij@...aro.org, Jianqun Xu <jay.xu@...k-chips.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Jianqun Xu <jay.xu@...k-chips.com>
Subject: Re: [PATCH 2/5] pinctrl: rockchip: make driver be tristate module

Hi,

Am Montag, 7. September 2020, 04:59:24 CEST schrieb Jianqun Xu:
> Make pinctrl-rockchip driver to be tristate module, support to build as
> a module, this is useful for GKI.
> 
> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
> ---
>  drivers/pinctrl/Kconfig            |  2 +-
>  drivers/pinctrl/pinctrl-rockchip.c | 18 ++++++++++++++++++
>  2 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index 4284f39a5c61..743eb2bb8709 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -207,7 +207,7 @@ config PINCTRL_OXNAS
>  	select MFD_SYSCON
>  
>  config PINCTRL_ROCKCHIP
> -	bool
> +	tristate "Rockchip gpio and pinctrl driver"
>  	depends on OF
>  	select PINMUX
>  	select GENERIC_PINCONF
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index 0401c1da79dd..cc7512acfc5f 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -16,10 +16,12 @@
>   */
>  
>  #include <linux/init.h>
> +#include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
>  #include <linux/bitops.h>
>  #include <linux/gpio/driver.h>
> +#include <linux/of_device.h>

of_device.h below of_address.h please


>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/pinctrl/machine.h>
> @@ -4257,4 +4259,20 @@ static int __init rockchip_pinctrl_drv_register(void)
>  {
>  	return platform_driver_register(&rockchip_pinctrl_driver);
>  }
> +
> +static void __exit rockchip_pinctrl_drv_unregister(void)
> +{
> +	platform_driver_unregister(&rockchip_pinctrl_driver);
> +}
> +
> +#ifdef CONFIG_PINCTRL_ROCKCHIP_MODULE
> +module_init(rockchip_pinctrl_drv_register);
> +#else
>  postcore_initcall(rockchip_pinctrl_drv_register);
> +#endif

You definitly don't need this hack. For modules postcore_initcall
already points to module_init ... see

https://elixir.bootlin.com/linux/latest/source/include/linux/module.h#L114


Heiko