linux-kernel - Re: [PATCH v4 2/3] gpio: ch341: add MFD cell driver for the CH341

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Message-ID: <CACRpkdaOHHkJnvB=RQ8dLXGxT_h5mGgy5Np87QVMcPzegNi2oQ@mail.gmail.com>
Date:   Mon, 28 Mar 2022 17:05:57 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     frank zago <frank@...o.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, Johan Hovold <johan@...nel.org>,
        linux-usb@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v4 2/3] gpio: ch341: add MFD cell driver for the CH341

Hi Frank,

thanks for your patch!

I see you already got a bunch of homework from Andy, I will do a more
thorough review on the next iteration, just a few things:

On Mon, Mar 21, 2022 at 5:21 AM frank zago <frank@...o.net> wrote:

> The GPIO interface offers 16 GPIOs. 6 are read/write, and 10 are
> read-only.
>
> Signed-off-by: frank zago <frank@...o.net>
(...)
> +config GPIO_CH341
> +       tristate "CH341 USB adapter in GPIO/I2C/SPI mode"
> +       depends on MFD_CH341

I would add
default MFD_CD341

This way it gets selected automatically if the MFD module gets
selected. (I suspect you should do the same with the I2C module).

> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/core.h>
> +#include <linux/gpio.h>

Use <linux/gpio/driver.h>

Yours,
Linus Walleij