linux-kernel - Re: [PATCH next 1/2] gpio: hisi: Add initial device tree support

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Date:   Tue, 8 Nov 2022 19:17:32 +0800
From:   chenweilong <chenweilong@...wei.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     <f.fangjian@...wei.com>, <yangyicong@...ilicon.com>,
        <xuwei5@...wei.com>, <robh+dt@...nel.org>, <robh@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH next 1/2] gpio: hisi: Add initial device tree support

On 2022/11/8 18:33, Linus Walleij wrote:
> Hi Weilong,
>
> thanks for your patch!
>
> On Wed, Oct 26, 2022 at 5:34 AM Weilong Chen <chenweilong@...wei.com> wrote:
>
>> Add support for HiSilicon GPIO controller in embedded platform, which
>> boot from devicetree.
>>
>> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> I will provide OF comments, I let Andy and other ACPI experts say
> what is necessary for ACPI.
>
> (...)
>> +#include <linux/acpi.h>
> I don't know if this is necessary, check it.
>
>>  #include <linux/gpio/driver.h>
>>  #include <linux/module.h>
>>  #include <linux/mod_devicetable.h>
>> +#include <linux/of.h>
> This is unnecessary for what you are trying to do. Drop it.
>
>> +#ifdef CONFIG_ACPI
>>  static const struct acpi_device_id hisi_gpio_acpi_match[] = {
>>         {"HISI0184", 0},
>>         {}
>>  };
>>  MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match);
>> +#endif
> Don't know about this #ifdef, check if it is needed.
>
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id hisi_gpio_dts_match[] = {
>> +       { .compatible = "hisilicon,gpio-ascend910", },
>> +       { }
>> +};
>> +MODULE_DEVICE_TABLE(of, hisi_gpio_dts_match);
>> +#endif
> Drop the ifdef, it is not needed.
>
>>  static void hisi_gpio_get_pdata(struct device *dev,
>>                                 struct hisi_gpio *hisi_gpio)
>> @@ -310,7 +322,8 @@ static int hisi_gpio_probe(struct platform_device *pdev)
>>  static struct platform_driver hisi_gpio_driver = {
>>         .driver         = {
>>                 .name   = HISI_GPIO_DRIVER_NAME,
>> -               .acpi_match_table = hisi_gpio_acpi_match,
>> +               .acpi_match_table = ACPI_PTR(hisi_gpio_acpi_match),
>> +               .of_match_table = of_match_ptr(hisi_gpio_dts_match),
> Drop of_match_ptr() just assign it.
>
> The reason it works is because we put struct of_device_id into the generic
> headers so we can avoid the ifdefing.
>
> Yours,
> Linus Walleij

Thank for your review，I get it，and make  improvements in subsequent patches.


Best regards,

Weilong Chen.

> .