linux-kernel - Re: [PATCH v1 2/2] gpio: ds4520: Add ADI DS4520 Regulator Support

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Message-ID: <CACRpkda5G5b+At5s1WFudpQBQ6LDQxhE3fZj7eBhkZ=thvnQhg@mail.gmail.com>
Date:   Fri, 31 Mar 2023 11:41:36 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Okan Sahin <okan.sahin@...log.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] gpio: ds4520: Add ADI DS4520 Regulator Support

Hi Okan,

thanks for your patch!

First: why is the word "Regulator" in the subject? I don't quite get it.

On Mon, Mar 27, 2023 at 3:01 PM Okan Sahin <okan.sahin@...log.com> wrote:
>
> Gpio I/O expander.
>
> Signed-off-by: Okan Sahin <okan.sahin@...log.com>

This commit log is too terse. Write a bit about what this hardware is.

> +config GPIO_DS4520
> +       tristate "DS4520 I2C GPIO expander"
> +       select REGMAP_I2C
> +       help
> +         GPIO driver for Maxim MAX7300 I2C-based GPIO expander.

Is it MAX7300, I don't get this, it seems super-confused.

> +         Say yes here to enable the GPIO driver for the ADI DS4520 chip.
> +
> +         To compile this driver as a module, choose M here: the module will
> +         be called gpio-ds4520.

(...)

The driver is pretty straight-forward, but I think this can use the
generic GPIO_REGMAP helpers in
drivers/gpio/gpio-regmap.c
check other drivers selecting this helper library for inspiration.

Yours,
Linus Walleij