linux-kernel - Re: [PATCH] gpio: mpc8xxx: Add ACPI support

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Date:   Sun, 14 Mar 2021 15:51:54 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ran Wang <ran.wang_1@....com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: mpc8xxx: Add ACPI support

On Fri, Mar 12, 2021 at 8:53 AM Ran Wang <ran.wang_1@....com> wrote:

First of all, please add me to the Cc list for the next version of the patch.

> Current implementation only supports DT, now add ACPI support.
>
> Note that compared to device of 'fsl,qoriq-gpio', LS1028A and

to devices

> LS1088A's GPIO have no extra programming, so simplify related checking.

...

> +#include <linux/acpi.h>

Nope, you rather need property.h and mod_devicetable.h.

...

> +       if (pdev->dev.of_node) {
> +               devtype = of_device_get_match_data(&pdev->dev);
> +       } else {
> +               acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
> +                                               &pdev->dev);
> +               if (acpi_id)
> +                       devtype = (struct mpc8xxx_gpio_devtype *) acpi_id->driver_data;
> +       }

No, please use device_get_match_data() instead of the entire conditional block.


> +       if (pdev->dev.of_node) {
> +               if (of_device_is_compatible(np, "fsl,qoriq-gpio"))
> +                       gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
> +       } else {
> +               if (acpi_match_device(pdev->dev.driver->acpi_match_table,
> +                                       &pdev->dev))
> +                       gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
> +       }

Yeah, no need to call acpi_match_device() here.
Instead use stuff from OF, like

if (of_device_is_compatible() || !(IS_ERR_OR_NULL(fwnode) ||
is_of_node(fwnode)))
(check the logic)

...

> +#ifdef CONFIG_ACPI

No ugly ifdeffery, please.

> +static const struct acpi_device_id gpio_acpi_ids[] = {
> +       {"NXP0031",},
> +       { }
> +};
> +MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids);
> +#endif
> +
>  static struct platform_driver mpc8xxx_plat_driver = {
>         .probe          = mpc8xxx_probe,
>         .remove         = mpc8xxx_remove,
>         .driver         = {
>                 .name = "gpio-mpc8xxx",
>                 .of_match_table = mpc8xxx_gpio_ids,

> +               .acpi_match_table = ACPI_PTR(gpio_acpi_ids),

Drop ACPI_PTR().

>         },
>  };


-- 
With Best Regards,
Andy Shevchenko