linux-kernel - Re: [PATCH] gpio: menz127: add support for 16Z034 and 16Z037 GPIO controllers

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Message-ID: <CAMRc=MddjpF_GbJW-n8c9OTnAmMqb=P7NFZXR=3tPSRoHe8Nyw@mail.gmail.com>
Date: Wed, 5 Nov 2025 09:36:52 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jose Javier Rodriguez Barbarin <dev-josejavier.rodriguez@...gon.com>
Cc: linus.walleij@...aro.org, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: menz127: add support for 16Z034 and 16Z037 GPIO controllers

On Fri, Oct 31, 2025 at 11:08 AM Jose Javier Rodriguez Barbarin
<dev-josejavier.rodriguez@...gon.com> wrote:
>
> From 7655a73f3888a5d164d1f287ba1f2989bb2aadd2 Mon Sep 17 00:00:00 2001
> From: Javier Rodriguez <josejavier.rodriguez@...gon.com>
> Date: Tue, 28 Oct 2025 17:40:14 +0100
> Subject: [PATCH] gpio: menz127: add support for 16Z034 and 16Z037 GPIO
>  controllers
>

I don't think you used `git send-email` to send this, did you just
copy the contents of the generated .patch into the email client?

> The 16Z034 and 16Z037 are 8 bits GPIO controllers that share the
> same registers and features of the 16Z127 GPIO controller.
>
> Reviewed-by: Felipe Fensen Casado <felipe.jensen@...gon.com>
> Signed-off-by: Javier Rodriguez <josejavier.rodriguez@...gon.com>
> ---
>  drivers/gpio/gpio-menz127.c | 36 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-menz127.c b/drivers/gpio/gpio-menz127.c
> index da2bf9381cc4..ec9228f1e631 100644
> --- a/drivers/gpio/gpio-menz127.c
> +++ b/drivers/gpio/gpio-menz127.c
> @@ -24,6 +24,12 @@
>  #define MEN_Z127_ODER  0x1C
>  #define GPIO_TO_DBCNT_REG(gpio)        ((gpio * 4) + 0x80)
>
> +

Stray newline.

> +/* MEN Z127 supported model ids*/
> +#define MEN_Z127_ID    0x7f
> +#define MEN_Z034_ID    0x22
> +#define MEN_Z037_ID    0x25
> +
>  #define MEN_Z127_DB_MIN_US     50
>  /* 16 bit compare register. Each bit represents 50us */
>  #define MEN_Z127_DB_MAX_US     (0xffff * MEN_Z127_DB_MIN_US)
> @@ -36,6 +42,25 @@ struct men_z127_gpio {
>         struct resource *mem;
>  };
>
> +static int men_z127_lookup_gpio_size(struct mcb_device *mdev,
> +                                    unsigned long *sz)
> +{
> +       switch (mdev->id) {
> +       case MEN_Z127_ID:
> +               *sz = 4;
> +               break;
> +       case MEN_Z034_ID:
> +       case MEN_Z037_ID:
> +               *sz = 1;
> +               break;
> +       default:
> +               dev_err(&mdev->dev, "no size found for id %d", mdev->id);
> +               return -EINVAL;

You can return dev_err_probe() here, it's only used in probe(). But
TBH probe() is so small I'd just inline this into it.

> +       }
> +
> +       return 0;
> +}
> +
>  static int men_z127_debounce(struct gpio_chip *gc, unsigned gpio,
>                              unsigned debounce)
>  {
> @@ -140,6 +165,7 @@ static int men_z127_probe(struct mcb_device *mdev,
>         struct men_z127_gpio *men_z127_gpio;
>         struct device *dev = &mdev->dev;
>         int ret;
> +       unsigned long sz;
>
>         men_z127_gpio = devm_kzalloc(dev, sizeof(struct men_z127_gpio),
>                                      GFP_KERNEL);
> @@ -163,9 +189,13 @@ static int men_z127_probe(struct mcb_device *mdev,
>
>         mcb_set_drvdata(mdev, men_z127_gpio);
>
> +       ret = men_z127_lookup_gpio_size(mdev, &sz);
> +       if (ret)
> +               return ret;
> +
>         config = (struct gpio_generic_chip_config) {
>                 .dev = &mdev->dev,
> -               .sz = 4,
> +               .sz = sz,
>                 .dat = men_z127_gpio->reg_base + MEN_Z127_PSR,
>                 .set = men_z127_gpio->reg_base + MEN_Z127_CTRL,
>                 .dirout = men_z127_gpio->reg_base + MEN_Z127_GPIODR,
> @@ -186,7 +216,9 @@ static int men_z127_probe(struct mcb_device *mdev,
>  }
>
>  static const struct mcb_device_id men_z127_ids[] = {
> -       { .device = 0x7f },
> +       { .device = MEN_Z127_ID },
> +       { .device = MEN_Z034_ID },
> +       { .device = MEN_Z037_ID },
>         { }
>  };
>  MODULE_DEVICE_TABLE(mcb, men_z127_ids);
> --
> 2.51.0

Bartosz