linux-kernel - Re: [PATCH v3 2/7] gpio: Add Nuvoton NCT6694 GPIO support

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Message-ID: <CACRpkdajLe94novxjsHkCCx3m5raB0DxMnnSegCqkdWxRoWazw@mail.gmail.com>
Date: Fri, 20 Dec 2024 13:41:59 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Ming Yu <a0282524688@...il.com>
Cc: tmyu0@...oton.com, lee@...nel.org, brgl@...ev.pl, andi.shyti@...nel.org, 
	mkl@...gutronix.de, mailhol.vincent@...adoo.fr, andrew+netdev@...n.ch, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	wim@...ux-watchdog.org, linux@...ck-us.net, jdelvare@...e.com, 
	alexandre.belloni@...tlin.com, linux-kernel@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, 
	linux-watchdog@...r.kernel.org, linux-hwmon@...r.kernel.org, 
	linux-rtc@...r.kernel.org
Subject: Re: [PATCH v3 2/7] gpio: Add Nuvoton NCT6694 GPIO support

Hi Ming,

thanks for your patch!

Some nits below:

On Tue, Dec 10, 2024 at 11:46 AM Ming Yu <a0282524688@...il.com> wrote:

> This driver supports GPIO and IRQ functionality for NCT6694 MFD
> device based on USB interface.
>
> Signed-off-by: Ming Yu <tmyu0@...oton.com>
(...)
> +#include <linux/gpio/driver.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/nct6694.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>

#include <linux/bits.h>
is missing, include it explicitly.

> +       return !(BIT(offset) & data->xmit_buf);

Here you use the BIT() macro from <linux/bits.h>

> +static int nct6694_direction_input(struct gpio_chip *gpio, unsigned int offset)
> +{
> +       struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
> +       int ret;
> +
> +       guard(mutex)(&data->lock);
> +
> +       ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
> +                              NCT6694_GPO_DIR + data->group,
> +                              NCT6694_GPIO_LEN, &data->xmit_buf);
> +       if (ret < 0)
> +               return ret;
> +
> +       data->xmit_buf &= ~(1 << offset);

data->xmit_buf &= ~BIT(offset);

> +static int nct6694_direction_output(struct gpio_chip *gpio,
> +                                   unsigned int offset, int val)
> +{
> +       struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
> +       int ret;
> +
> +       guard(mutex)(&data->lock);
> +
> +       /* Set direction to output */
> +       ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
> +                              NCT6694_GPO_DIR + data->group,
> +                              NCT6694_GPIO_LEN, &data->xmit_buf);
> +       if (ret < 0)
> +               return ret;
> +
> +       data->xmit_buf |= (1 << offset);

data->xmit_buf |= BIT(offset);

> +       if (val)
> +               data->xmit_buf |= (1 << offset);
> +       else
> +               data->xmit_buf &= ~(1 << offset);

Same

> +static void nct6694_set_value(struct gpio_chip *gpio, unsigned int offset,
> +                             int val)
> +{
(...)
> +       if (val)
> +               data->xmit_buf |= (1 << offset);
> +       else
> +               data->xmit_buf &= ~(1 << offset);

Same

> +static irqreturn_t nct6694_irq_handler(int irq, void *priv)
> +{
> +       struct nct6694_gpio_data *data = priv;
> +       unsigned char status;
> +
> +       guard(mutex)(&data->lock);
> +
> +       nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
> +                        NCT6694_GPI_STS + data->group,
> +                        NCT6694_GPIO_LEN, &data->xmit_buf);
> +
> +       status = data->xmit_buf;
> +
> +       while (status) {
> +               int bit = __ffs(status);
> +
> +               data->xmit_buf = BIT(bit);
> +               handle_nested_irq(irq_find_mapping(data->gpio.irq.domain, bit));
> +               status &= ~(1 << bit);

Same

Just use BIT() consistently please.

Yours,
Linus Walleij