linux-kernel - Re: [PATCH v2 1/1] gpio: nct6116d: add new driver for several Nuvoton super io chips

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Message-ID: <CAHp75VdTJZ+4wF-AXbj2ERQ6zW-a+JpnO8gfO6T+LhFJyzBhJg@mail.gmail.com>
Date:   Mon, 4 Jul 2022 19:38:26 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Henning Schild <henning.schild@...mens.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tasanakorn Phaipool <tasanakorn@...il.com>,
        Sheng-Yuan Huang <syhuang3@...oton.com>,
        Kuan-Wei Ho <cwho@...oton.com>
Subject: Re: [PATCH v2 1/1] gpio: nct6116d: add new driver for several Nuvoton
 super io chips

On Mon, Jul 4, 2022 at 3:06 PM Henning Schild
<henning.schild@...mens.com> wrote:
>
> This patch adds gpio support for several Nuvoton NCTXXX chips. These

GPIO

s/This patch adds/Add/

> Super-I/O chips offer multiple functions of which several already have
> drivers in the kernel, i.e. hwmon and watchdog.

Seems better, my comments below.

...

> +#include <linux/gpio/driver.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>

At least types.h and bits.h are missed here.

...

> +#define gpio_dir(base) ((base) + 0)
> +#define gpio_data(base) ((base) + 1)

Can you prefix them? gpio_ namespace is not owned by this driver and
may collide with something in the future.

...

> +       if (dir & 1 << offset)

Missed BIT(offset) ?

> +               return GPIO_LINE_DIRECTION_OUT;

...

> +static int __init
> +nct6116d_gpio_device_add(const struct nct6116d_sio *sio)
> +{
> +       int err;
> +
> +       nct6116d_gpio_pdev = platform_device_alloc(KBUILD_MODNAME, -1);
> +       if (!nct6116d_gpio_pdev)
> +               return -ENOMEM;
> +
> +       err = platform_device_add_data(nct6116d_gpio_pdev, sio, sizeof(*sio));
> +       if (err) {
> +               pr_err("Platform data allocation failed\n");
> +               goto err;
> +       }
> +
> +       err = platform_device_add(nct6116d_gpio_pdev);
> +       if (err) {
> +               pr_err("Device addition failed\n");
> +               goto err;
> +       }
> +
> +       return 0;

platform_device_register_full() ?

Yeah, just read your other message. Can you drop an excerpt here to
see how it looks?

> +err:
> +       platform_device_put(nct6116d_gpio_pdev);
> +
> +       return err;
> +}

...

> +static int __init nct6116d_gpio_init(void)
> +{
> +       struct nct6116d_sio sio;
> +       int err;
> +
> +       if (nct6116d_find(0x2e, &sio) &&
> +           nct6116d_find(0x4e, &sio))
> +               return -ENODEV;
> +
> +       err = platform_driver_register(&nct6116d_gpio_driver);
> +       if (!err) {

if (err)
  return err;


> +               err = nct6116d_gpio_device_add(&sio);
> +               if (err)
> +                       platform_driver_unregister(&nct6116d_gpio_driver);
> +       }
> +
> +       return err;
> +}

--
With Best Regards,
Andy Shevchenko