linux-kernel - Re: [PATCH 1/2] pinctrl: imx: Support building SCU pinctrl driver as module

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Date:   Fri, 17 Jul 2020 11:39:53 +0300
From:   Daniel Baluta <daniel.baluta@....com>
To:     Anson Huang <anson.huang@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Cc:     dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 1/2] pinctrl: imx: Support building SCU pinctrl driver as
 module

On 7/17/20 2:44 AM, Anson Huang wrote:
> Hi, Daniel
>
>
>> Subject: Re: [PATCH 1/2] pinctrl: imx: Support building SCU pinctrl driver as
>> module
>>
>> On 7/16/20 6:21 PM, Anson Huang wrote:
>>> Hi, Daniel
>>>
>>>
>>>> Subject: Re: [PATCH 1/2] pinctrl: imx: Support building SCU pinctrl
>>>> driver as module
>>>>
>>>> Hi Anson,
>>>>
>>>> Few comments inline:
>>>>
>>>> On 7/16/20 6:06 PM, Anson Huang wrote:
>>>>> To support building i.MX SCU pinctrl driver as module, below things
>>>>> need to
>>>> be changed:
>>>>>        - Export SCU related functions and use "IS_ENABLED" instead of
>>>>>          "ifdef" to support SCU pinctrl driver user and itself to be
>>>>>          built as module;
>>>>>        - Use function callbacks for SCU related functions in pinctrl-imx.c
>>>>>          in order to support the scenario of PINCTRL_IMX is built in
>>>>>          while PINCTRL_IMX_SCU is built as module;
>>>>>        - All drivers using SCU pinctrl driver need to initialize the
>>>>>          SCU related function callback;
>>>>>        - Change PINCTR_IMX_SCU to tristate;
>>>>>        - Add module author, description and license.
>>>>>
>>>>> With above changes, i.MX SCU pinctrl driver can be built as module.
>>>> There are a lot of changes here. I think it would be better to try to
>>>> split them
>>>>
>>>> per functionality. One functional change per patch.
>>> Actually, I ever tried to split them, but the function will be broken.
>>> All the changes are just to support the module build. If split them,
>>> the bisect will have pinctrl build or function broken.
>> Hi Anson,
>>
>>
>> I see your point and I know that this is a very hard task to get it right from
>>
>> the first patches.
>>
>> But let me suggest at least that:
>>
>> - changes in  drivers/pinctrl/freescale/pinctrl-imx.c (include file and
>> MODULE_ macros should go to a separate patch).
> You meant in patch #2, the changes in Kconfig and the changes in .c file should
> be split to 2 patches?


No. I mean look at path #1.

The section above should be placed in a separate patch.

  static const struct of_device_id imx8qxp_pinctrl_of_match[] = {
diff --git a/drivers/pinctrl/freescale/pinctrl-scu.c b/drivers/pinctrl/freescale/pinctrl-scu.c
index 9df45d3..59b5f8a 100644
--- a/drivers/pinctrl/freescale/pinctrl-scu.c
+++ b/drivers/pinctrl/freescale/pinctrl-scu.c
@@ -7,6 +7,7 @@
  
  #include <linux/err.h>
  #include <linux/firmware/imx/sci.h>
+#include <linux/module.h>
  #include <linux/of_address.h>
  #include <linux/pinctrl/pinctrl.h>
  #include <linux/platform_device.h>
@@ -123,3 +124,7 @@ void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
  		pin_scu->mux_mode, pin_scu->config);
  }
  EXPORT_SYMBOL_GPL(imx_pinctrl_parse_pin_scu);
+
+MODULE_AUTHOR("Dong Aisheng<aisheng.dong@....com>");
+MODULE_DESCRIPTION("NXP i.MX SCU common pinctrl driver");
+MODULE_LICENSE("GPL v2");


This can be in a separate patch.