Re: [PATCH v2 09/10] gpio: bd73800: Support ROHM BD73800 PMIC GPIOs

[Linus Walleij]

Hi Matti,

thanks for your patch!

On Tue, Aug 4, 2026 at 12:23 PM Matti Vaittinen
<matti.vaittinen@xxxxxxxxx> wrote:


> +static int bd73800gpio_get(struct gpio_chip *chip, unsigned int offset)
> +{
> +       struct bd73800_gpio *data = gpiochip_get_data(chip);
> +       struct bd73800_gpio_pin_cfg *pin = &data->pin[offset];
> +       int ret, val;
> +
> +       /* Only pins configured as GPI via OTP can have their status read */
> +       if (pin->state != BD73800_PIN_GPI) {
> +               dev_dbg(data->dev, "pin %d (%x) not input. State %d\n", offset,
> +                       pin->mask, pin->state);
> +               return -EINVAL;
> +       }
> +
> +       ret = regmap_read(data->regmap, BD73800_REG_INT_5_SRC, &val);
> +       if (ret)
> +               return ret;
> +
> +       return val & pin->mask;
> +}
> +
> +static int bd73800gpo_set(struct gpio_chip *chip, unsigned int offset,
> +                         int value)
> +{
> +       struct bd73800_gpio *data = gpiochip_get_data(chip);
> +       struct bd73800_gpio_pin_cfg *pin = &data->pin[offset];
> +
> +       if (pin->state != BD73800_PIN_GPO) {
> +               dev_dbg(data->dev, "pin %d (%d) not output. State %d\n",
> +                       offset, pin->mask, pin->state);
> +
> +               return -EINVAL;
> +       }
> +
> +       if (value)
> +               return regmap_set_bits(data->regmap, BD73800_REG_GPO_OUT,
> +                                      pin->mask);
> +
> +       return regmap_clear_bits(data->regmap, BD73800_REG_GPO_OUT, pin->mask);
> +}

These can probably be handled by the latest version of gpio-regmap
helpers (the version in linux-next).

We now support both input-only and output-only in gpio-regmap.

Latest <linux/gpio/regmap.h>:

 * @fixed_direction_mask:
 *                      (Optional) Bitmap representing the GPIO lines that
 *                      make use of the @fixed_direction_output list to
 *                      enforce direction of the GPIO. If this is NULL
 *                      and @fixed_direction_output is defined, ALL GPIOs
 *                      are assumed to be fixed direction (out or in).
 * @fixed_direction_output:
 *                      (Optional) Bitmap representing the fixed direction of
 *                      the GPIO lines. Useful when there are GPIO lines with a
 *                      fixed direction mixed together in the same register.

It seems you can set up the fixed_direction_output mask from OTP
and just use the library, right?

Yours,
Linus Walleij