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Subject: Re: [PATCH v1 1/2] pinctrl: make MediaTek pinctrl v2 driver ready for
 buidling kernel module
To:     Light Hsieh <light.hsieh@mediatek.com>
Cc:     linus.walleij@linaro.org, linux-gpio@vger.kernel.org,
        sean.wang@kernel.org, linux-mediatek@lists.infradead.org,
        linux-kernel@vger.kernel.org, kuohong.wang@mediatek.com
References: <1581574105-1160-1-git-send-email-light.hsieh@mediatek.com>
 <1581574624.1827.4.camel@mtkswgap22>
 <b35c33a9-0d58-c98d-05eb-241efdc0c9af@gmail.com>
 <1581678137.724.9.camel@mtkswgap22>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata=
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Message-ID: <9d677385-6dee-8f52-8e23-d8a215708fbf@gmail.com>
Date:   Mon, 17 Feb 2020 11:25:43 +0100
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On 14/02/2020 12:02, Light Hsieh wrote:
> On Fri, 2020-02-14 at 11:37 +0100, Matthias Brugger wrote:
>>
>> 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
>>
> 
> Actually, I don't understand the necessity of splitting into 2 or 3
> patches.
> 

Basically because smaller logical changes per patch makes it easier to review
and understand what is done and why.

> 1. mtk-eint cannot be built as loadable module when pinctrl-paris and
> pinctrl-mtk-common-v2 is not built as loadable module.
> 
> 2. pinctrl-paris and pinctrl-mtk-common-v2 cannot be built as loadable
> module when pinctrl-mtk6765 is not built as loadable module
> 

Correct, but think about it that you want to backport these patches and add
support for a new SoC, in this case you don't need to add mt6765 support to your
downstream kernel.

Same if you want to be able to built moore as a module in the future. You will
only need to rely on patch 1.
But I won't argue with you, patch 1+2 can be put together if you insist. :)

But I think patch 3 should be independent for sure.

Regards,
Matthias

> 3. besides, if pinctrl-mtk675 and any other MediaTek platform pinctrl
> driver that use mtk-eint, pinctrl-paris, and pinctrl-mtk-common-v2 are
> built-in, mtk-eint, pinctrl-paris, and pinctrl-mtk-common-v2 cannot be
> built as loadable module.
> 
> The rationale can be learned from the description of change made to
> Kconfig and Makefile.
> 
> So, just applying patch 1 and patch 2 of your proposal does not make
> sense.
> 
> BR.
> 
> Light
> 
> 
> 
>>> Light
>>>
>>> On Thu, 2020-02-13 at 14:08 +0800, 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 platforms that use pinctrl-paris.c
>>>> of MediaTek pinctrl v2 ready for building kernel module.
>>>>
>>>> Signed-off-by: Light Hsieh <light.hsieh@mediatek.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@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,
>>>
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