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Date:   Fri, 14 Feb 2020 11:37:10 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Light Hsieh <light.hsieh@...iatek.com>, linus.walleij@...aro.org
Cc:     linux-gpio@...r.kernel.org, sean.wang@...nel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com
Subject: Re: [PATCH v1 1/2] pinctrl: make MediaTek pinctrl v2 driver ready for
 buidling kernel module



On 13/02/2020 07:17, Light Hsieh wrote:
> Dear Reviewers:
> 
> Google plan to make platform driver as kernel module in future Android
> kernel.
> This patch series prepare to make platforms that use MediaTek pinctrl
> paris driver (pinctrl-paris.c, pinctrl-mtk-common-v2.c, and mtk-eint.c)
> compatible for building either kernel module or built-in.
> 
> Please give your comments.
> 

I think I didn't explain myself good enough.
These should be three patches:

1. change mtk-eint driver + Kconfig to be loadable as a module
2. change pinctrl-paris + Kconfig to be loadable as a module
3. change mt6765.

Please make sure that every patch compiles and does not break the system. This
will later help to use git-bisect to hunt down bugs in the kernel.

Regards,
Matthias

> Light
> 
> On Thu, 2020-02-13 at 14:08 +0800, light.hsieh@...iatek.com wrote:
>> From: Light Hsieh <light.hsieh@...iatek.com>
>>
>> Google plan to make platform driver as kernel module for future
>> Andriod kernel. This patch make platforms that use pinctrl-paris.c
>> of MediaTek pinctrl v2 ready for building kernel module.
>>
>> Signed-off-by: Light Hsieh <light.hsieh@...iatek.com>
>> ---
>>  drivers/pinctrl/mediatek/mtk-eint.c              |  9 +++++++++
>>  drivers/pinctrl/mediatek/pinctrl-mt6765.c        |  4 ++++
>>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 ++++++++++++++++++++++++
>>  drivers/pinctrl/mediatek/pinctrl-paris.c         |  5 +++++
>>  drivers/pinctrl/pinconf-generic.c                |  1 +
>>  5 files changed, 43 insertions(+)
>>
>> 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-mt6765.c b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
>> index 905dae8c..2c59d39 100644
>> --- a/drivers/pinctrl/mediatek/pinctrl-mt6765.c
>> +++ b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
>> @@ -6,6 +6,7 @@
>>   *
>>   */
>>  
>> +#include <linux/module.h>
>>  #include "pinctrl-mtk-mt6765.h"
>>  #include "pinctrl-paris.h"
>>  
>> @@ -1103,3 +1104,6 @@ static int __init mt6765_pinctrl_init(void)
>>  	return platform_driver_register(&mt6765_pinctrl_driver);
>>  }
>>  arch_initcall(mt6765_pinctrl_init);
>> +
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DESCRIPTION("MediaTek MT6765 Pinctrl 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@...iatek.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,
> 
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> Linux-mediatek@...ts.infradead.org
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> 

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