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

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Date:   Tue, 8 Nov 2022 11:33:57 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Weilong Chen <chenweilong@...wei.com>,
        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

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