linux-kernel - Re: [PATCH v6 3/3] iio: addac: add AD74413R driver

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Date:   Sat, 27 Nov 2021 02:36:06 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Cosmin Tanislav <demonsingur@...il.com>
Cc:     cosmin.tanislav@...log.com, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Rob Herring <robh+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-gpio@...r.kernel.org, Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v6 3/3] iio: addac: add AD74413R driver

Hi Cosmin,

thanks for your patch!

I noticed this has a GPIO chip inside of it :)

On Fri, Nov 26, 2021 at 5:03 PM Cosmin Tanislav <demonsingur@...il.com> wrote:

These:

> +static void ad74413r_gpio_set(struct gpio_chip *chip,
> +                             unsigned int offset, int val)
> +static void ad74413r_gpio_set_multiple(struct gpio_chip *chip,
> +                                      unsigned long *mask,
> +                                      unsigned long *bits)
> +static int ad74413r_gpio_get(struct gpio_chip *chip, unsigned int offset)
> +static int ad74413r_gpio_get_multiple(struct gpio_chip *chip,
> +                                     unsigned long *mask,
> +                                     unsigned long *bits)

(...)
> +       if (st->num_gpo_gpios) {
> +               st->gpo_gpiochip.owner = THIS_MODULE;
> +               st->gpo_gpiochip.label = st->chip_info->name;
> +               st->gpo_gpiochip.base = -1;
> +               st->gpo_gpiochip.ngpio = st->num_gpo_gpios;
> +               st->gpo_gpiochip.parent = st->dev;
> +               st->gpo_gpiochip.can_sleep = true;
> +               st->gpo_gpiochip.set = ad74413r_gpio_set;
> +               st->gpo_gpiochip.set_multiple = ad74413r_gpio_set_multiple;
> +               st->gpo_gpiochip.set_config = ad74413r_gpio_set_gpo_config;
> +               st->gpo_gpiochip.get_direction =
> +                       ad74413r_gpio_get_gpo_direction;
> +
> +               ret = devm_gpiochip_add_data(st->dev, &st->gpo_gpiochip, st);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       if (st->num_comparator_gpios) {
> +               st->comp_gpiochip.owner = THIS_MODULE;
> +               st->comp_gpiochip.label = st->chip_info->name;
> +               st->comp_gpiochip.base = -1;
> +               st->comp_gpiochip.ngpio = st->num_comparator_gpios;
> +               st->comp_gpiochip.parent = st->dev;
> +               st->comp_gpiochip.can_sleep = true;
> +               st->comp_gpiochip.get = ad74413r_gpio_get;
> +               st->comp_gpiochip.get_multiple = ad74413r_gpio_get_multiple;
> +               st->comp_gpiochip.set_config = ad74413r_gpio_set_comp_config;
> +               st->comp_gpiochip.get_direction =
> +                       ad74413r_gpio_get_comp_direction;

Look a bit like the generic drivers/gpio/gpio-regmap.c
GPIO_REGMAP.

Example:
drivers/gpio/gpio-sl28cpld.c
drivers/pinctrl/bcm/pinctrl-bcm63xx.c

Or is it too particular for this?

I don't know if the regmap gpio can deal with adding a few functions
like a custom .set_config() on top of the templates to be honest, maybe
that is something we can fix in that case?

Cc:ing Michael Walle so he can pitch in if I'm onto something here or not.

Anyways the GPIO portions look good otherwise.

Yours,
Linus Walleij