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Subject: Re: [PATCH v1 1/2] pinctrl: make MediaTek pinctrl v2 driver ready for
 buidling loadable module
To:     light.hsieh@mediatek.com, linus.walleij@linaro.org
Cc:     sean.wang@kernel.org, kuohong.wang@mediatek.com,
        linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
        linux-mediatek@lists.infradead.org
References: <1582016614-20728-1-git-send-email-light.hsieh@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata=
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Message-ID: <3db80f29-093b-ffc8-4c45-07a0508b523b@gmail.com>
Date:   Tue, 18 Feb 2020 17:39:47 +0100
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Light,

On 18/02/2020 10:03, light.hsieh@mediatek.com wrote:
> From: Light Hsieh <light.hsieh@mediatek.com>
> 
> Google plan to make platform driver as kernel module for future
> Andriod kernel. This patch make pinctrl-paris.c ready for building as
> loadable module. Besides, mtk-eint.c and pinctrl-mtk-common-v2.c,
> the dependent objects of pinctrl-paris.c, are made to be ready for
> building as loadable module.

My proposal for the commit message:

In the future we want to be able to build the pinctrl driver, based on paris, as
kernel module. This patch allows pinctrl-paris.c the external interrupt
controller mtk-eint.c and pinctrl-mtk-common-v2.c to be loadable as module.

With this or something similar:

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> 
> The following is the rationale for determining whether mtk-eint.c,
> pinctrl-mtk-common-v2.c, and pinctrl-paris.c are built as loadable module:
> 
> 1. drivers/pinctrl/mediatek/Kconfig:
> 1.1 PINCTRL_MTXXXX: change from bool to tristate. It is specified in
>         defconfig file. MTXXXX can only be the user of pinctrl-paris,
>         which can MT6765 or MT8183. The patch for changing
>         PINCTRL_MT6765 from bool to tristate will be given as the next
>         patch of the patch series.
> 1.2 PINCTRL_MTK_PARIS: change from bool to tristate and select
>         PINCTRL_MTK_V2. No need to specify in defconfig file.
>       * PINCTRL_MTK_PARIS will be y if any PINCTRL_MTXXXX selecting
>         PINCTRL_MTK_PARIS is y.
>       * PINCTRL_MTK_PARIS will be n if all PINCTRL_MTXXXX selecting
>         PINCTRL_MTK_PARIS is n.
>       * PINCTRL_MTK_PARIS will be m if some PINCTRL_MTXXXX selecting
>         PINCTRL_MTK_PARIS are m and other PINCTRL_MTXXXX selecting
>         PINCTRL_MTK_PARIS are n.
> 1.3 PINCTRL_MTK_MOORE: select EINT_MTK and PINCTRL_MTK_V2. It is make
>         to be ready for building as loadable kernel module because it
>         is not used on Android kernel.
> 1.4 PINCTRL_MTK_V2: add this tristate config which depends on
>         PINCTRL_MTK_PARIS and PINCTRL_MTK_MOORE. No need to specify in
>         defconfig file.
>       * PINCTRL_MTK_V2 will be y if either PINCTRL_MTK_PARIS or
>         PINCTRL_MTK_MOORE is y.
>       * PINCTRL_MTK_V2 will be n if both PINCTRL_MTK_PARIS and
>         PINCTRL_MTK_MOORE are n.
>       * PINCTRL_MTK_V2 will be m if PINCTRL_MTK_PARIS is m and
>         PINCTRL_MTK_MOORE is n.
> 1.5 EINT_MTK: change from bool to tristate and add rule for default.
>         No need to specify in defconfig file.
>       * First rule: determine if EINT_MTK is y or n according to
>         selection of PINCTRL_MTK or PINCTRL_MTK_MORE.
>       * Second rule: determine if EINT_MTK is y, m, or n according to
>         selection of PINCTRL_MTK_PARIS.
> 
> 2. drivers/pinctrl/mediatek/Makefile: Use PINCTRL_MTK_V2 to determine
>         if pinctrl-mtk-common-v2.c is built as loadable module or
>         built-in.
> 
> Signed-off-by: Light Hsieh <light.hsieh@mediatek.com>
> ---
>  drivers/pinctrl/mediatek/Kconfig                 | 13 +++++++++++--
>  drivers/pinctrl/mediatek/Makefile                |  5 +++--
>  drivers/pinctrl/mediatek/mtk-eint.c              |  9 +++++++++
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 ++++++++++++++++++++++++
>  drivers/pinctrl/mediatek/pinctrl-paris.c         |  5 +++++
>  drivers/pinctrl/pinconf-generic.c                |  1 +
>  6 files changed, 53 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pinctrl/mediatek/Kconfig b/drivers/pinctrl/mediatek/Kconfig
> index 701f9af..4cd1109 100644
> --- a/drivers/pinctrl/mediatek/Kconfig
> +++ b/drivers/pinctrl/mediatek/Kconfig
> @@ -3,10 +3,12 @@ menu "MediaTek pinctrl drivers"
>  	depends on ARCH_MEDIATEK || COMPILE_TEST
>  
>  config EINT_MTK
> -	bool "MediaTek External Interrupt Support"
> +	tristate "MediaTek External Interrupt Support"
>  	depends on PINCTRL_MTK || PINCTRL_MTK_MOORE || PINCTRL_MTK_PARIS || COMPILE_TEST
>  	select GPIOLIB
>  	select IRQ_DOMAIN
> +	default y if PINCTRL_MTK || PINCTRL_MTK_MOORE
> +	default PINCTRL_MTK_PARIS
>  
>  config PINCTRL_MTK
>  	bool
> @@ -17,23 +19,30 @@ config PINCTRL_MTK
>  	select EINT_MTK
>  	select OF_GPIO
>  
> +config PINCTRL_MTK_V2
> +	tristate
> +	depends on PINCTRL_MTK_MOORE || PINCTRL_MTK_PARIS
> +
>  config PINCTRL_MTK_MOORE
>  	bool
>  	depends on OF
>  	select GENERIC_PINCONF
>  	select GENERIC_PINCTRL_GROUPS
>  	select GENERIC_PINMUX_FUNCTIONS
> +	select EINT_MTK
>  	select GPIOLIB
>  	select OF_GPIO
> +	select PINCTRL_MTK_V2
>  
>  config PINCTRL_MTK_PARIS
> -	bool
> +	tristate
>  	depends on OF
>  	select PINMUX
>  	select GENERIC_PINCONF
>  	select GPIOLIB
>  	select EINT_MTK
>  	select OF_GPIO
> +	select PINCTRL_MTK_V2
>  
>  # For ARMv7 SoCs
>  config PINCTRL_MT2701
> diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
> index a74325a..4b71328 100644
> --- a/drivers/pinctrl/mediatek/Makefile
> +++ b/drivers/pinctrl/mediatek/Makefile
> @@ -2,8 +2,9 @@
>  # Core
>  obj-$(CONFIG_EINT_MTK)		+= mtk-eint.o
>  obj-$(CONFIG_PINCTRL_MTK)	+= pinctrl-mtk-common.o
> -obj-$(CONFIG_PINCTRL_MTK_MOORE) += pinctrl-moore.o pinctrl-mtk-common-v2.o
> -obj-$(CONFIG_PINCTRL_MTK_PARIS) += pinctrl-paris.o pinctrl-mtk-common-v2.o
> +obj-$(CONFIG_PINCTRL_MTK_V2)	+= pinctrl-mtk-common-v2.o
> +obj-$(CONFIG_PINCTRL_MTK_MOORE) += pinctrl-moore.o
> +obj-$(CONFIG_PINCTRL_MTK_PARIS) += pinctrl-paris.o
>  
>  # SoC Drivers
>  obj-$(CONFIG_PINCTRL_MT2701)	+= pinctrl-mt2701.o
> diff --git a/drivers/pinctrl/mediatek/mtk-eint.c b/drivers/pinctrl/mediatek/mtk-eint.c
> index 7e526bcf..99703a8 100644
> --- a/drivers/pinctrl/mediatek/mtk-eint.c
> +++ b/drivers/pinctrl/mediatek/mtk-eint.c
> @@ -9,6 +9,7 @@
>   *
>   */
>  
> +#include <linux/module.h>
>  #include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/gpio/driver.h>
> @@ -379,6 +380,7 @@ int mtk_eint_do_suspend(struct mtk_eint *eint)
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_eint_do_suspend);
>  
>  int mtk_eint_do_resume(struct mtk_eint *eint)
>  {
> @@ -386,6 +388,7 @@ int mtk_eint_do_resume(struct mtk_eint *eint)
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_eint_do_resume);
>  
>  int mtk_eint_set_debounce(struct mtk_eint *eint, unsigned long eint_num,
>  			  unsigned int debounce)
> @@ -440,6 +443,7 @@ int mtk_eint_set_debounce(struct mtk_eint *eint, unsigned long eint_num,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_eint_set_debounce);
>  
>  int mtk_eint_find_irq(struct mtk_eint *eint, unsigned long eint_n)
>  {
> @@ -451,6 +455,7 @@ int mtk_eint_find_irq(struct mtk_eint *eint, unsigned long eint_n)
>  
>  	return irq;
>  }
> +EXPORT_SYMBOL_GPL(mtk_eint_find_irq);
>  
>  int mtk_eint_do_init(struct mtk_eint *eint)
>  {
> @@ -495,3 +500,7 @@ int mtk_eint_do_init(struct mtk_eint *eint)
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_eint_do_init);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("MediaTek EINT Driver");
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> index 1da9425..cdf2d69 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> @@ -6,6 +6,7 @@
>   *
>   */
>  
> +#include <linux/module.h>
>  #include <dt-bindings/pinctrl/mt65xx.h>
>  #include <linux/device.h>
>  #include <linux/err.h>
> @@ -206,6 +207,7 @@ int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_hw_set_value);
>  
>  int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
>  		     int field, int *value)
> @@ -225,6 +227,7 @@ int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_hw_get_value);
>  
>  static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
>  {
> @@ -363,6 +366,7 @@ int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
>  
>  	return mtk_eint_do_init(hw->eint);
>  }
> +EXPORT_SYMBOL_GPL(mtk_build_eint);
>  
>  /* Revision 0 */
>  int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
> @@ -382,6 +386,7 @@ int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set);
>  
>  int mtk_pinconf_bias_disable_get(struct mtk_pinctrl *hw,
>  				 const struct mtk_pin_desc *desc, int *res)
> @@ -404,6 +409,7 @@ int mtk_pinconf_bias_disable_get(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get);
>  
>  int mtk_pinconf_bias_set(struct mtk_pinctrl *hw,
>  			 const struct mtk_pin_desc *desc, bool pullup)
> @@ -423,6 +429,7 @@ int mtk_pinconf_bias_set(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set);
>  
>  int mtk_pinconf_bias_get(struct mtk_pinctrl *hw,
>  			 const struct mtk_pin_desc *desc, bool pullup, int *res)
> @@ -442,6 +449,7 @@ int mtk_pinconf_bias_get(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get);
>  
>  /* Revision 1 */
>  int mtk_pinconf_bias_disable_set_rev1(struct mtk_pinctrl *hw,
> @@ -456,6 +464,7 @@ int mtk_pinconf_bias_disable_set_rev1(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set_rev1);
>  
>  int mtk_pinconf_bias_disable_get_rev1(struct mtk_pinctrl *hw,
>  				      const struct mtk_pin_desc *desc, int *res)
> @@ -473,6 +482,7 @@ int mtk_pinconf_bias_disable_get_rev1(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get_rev1);
>  
>  int mtk_pinconf_bias_set_rev1(struct mtk_pinctrl *hw,
>  			      const struct mtk_pin_desc *desc, bool pullup)
> @@ -492,6 +502,7 @@ int mtk_pinconf_bias_set_rev1(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_rev1);
>  
>  int mtk_pinconf_bias_get_rev1(struct mtk_pinctrl *hw,
>  			      const struct mtk_pin_desc *desc, bool pullup,
> @@ -517,6 +528,7 @@ int mtk_pinconf_bias_get_rev1(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_gev1);
>  
>  /* Combo for the following pull register type:
>   * 1. PU + PD
> @@ -717,6 +729,7 @@ int mtk_pinconf_bias_set_combo(struct mtk_pinctrl *hw,
>  out:
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_combo);
>  
>  int mtk_pinconf_bias_get_combo(struct mtk_pinctrl *hw,
>  			      const struct mtk_pin_desc *desc,
> @@ -737,6 +750,7 @@ int mtk_pinconf_bias_get_combo(struct mtk_pinctrl *hw,
>  out:
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get_combo);
>  
>  /* Revision 0 */
>  int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
> @@ -766,6 +780,7 @@ int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
>  
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set);
>  
>  int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
>  			  const struct mtk_pin_desc *desc, int *val)
> @@ -790,6 +805,7 @@ int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get);
>  
>  /* Revision 1 */
>  int mtk_pinconf_drive_set_rev1(struct mtk_pinctrl *hw,
> @@ -811,6 +827,7 @@ int mtk_pinconf_drive_set_rev1(struct mtk_pinctrl *hw,
>  
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_rev1);
>  
>  int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
>  			       const struct mtk_pin_desc *desc, int *val)
> @@ -828,18 +845,21 @@ int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_rev1);
>  
>  int mtk_pinconf_drive_set_raw(struct mtk_pinctrl *hw,
>  			       const struct mtk_pin_desc *desc, u32 arg)
>  {
>  	return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV, arg);
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_raw);
>  
>  int mtk_pinconf_drive_get_raw(struct mtk_pinctrl *hw,
>  			       const struct mtk_pin_desc *desc, int *val)
>  {
>  	return mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, val);
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_raw);
>  
>  int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
>  			     const struct mtk_pin_desc *desc, bool pullup,
> @@ -880,6 +900,7 @@ int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
>  
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_set);
>  
>  int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
>  			     const struct mtk_pin_desc *desc, bool pullup,
> @@ -922,6 +943,7 @@ int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_get);
>  
>  int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
>  			      const struct mtk_pin_desc *desc, u32 arg)
> @@ -948,6 +970,7 @@ int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
>  
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_set);
>  
>  int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
>  			      const struct mtk_pin_desc *desc, u32 *val)
> @@ -971,3 +994,4 @@ int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_get);
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index 83bf29c..af97794 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -9,6 +9,7 @@
>   *	   Hongzhou.Yang <hongzhou.yang@mediatek.com>
>   */
>  
> +#include <linux/module.h>
>  #include <linux/gpio/driver.h>
>  #include <dt-bindings/pinctrl/mt65xx.h>
>  #include "pinctrl-paris.h"
> @@ -1037,3 +1038,7 @@ static int mtk_paris_pinctrl_resume(struct device *device)
>  	.suspend_noirq = mtk_paris_pinctrl_suspend,
>  	.resume_noirq = mtk_paris_pinctrl_resume,
>  };
> +EXPORT_SYMBOL_GPL(mtk_paris_pinctrl_probe);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("MediaTek Pinctrl Common Driver V2 Paris");
> diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
> index 9eb8630..dfef471 100644
> --- a/drivers/pinctrl/pinconf-generic.c
> +++ b/drivers/pinctrl/pinconf-generic.c
> @@ -286,6 +286,7 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
>  	kfree(cfg);
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config);
>  
>  int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
>  		struct device_node *np, struct pinctrl_map **map,
>