linux-kernel - Re: [PATCH 08/62] gpio: gpio-bcm-kona: Use new GPIO_LINE

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Date:   Tue, 5 Nov 2019 10:14:39 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        mazziesaccount@...il.com
Cc:     Ray Jui <rjui@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/62] gpio: gpio-bcm-kona: Use new GPIO_LINE_DIRECTION

Unlike some other opinions I've seen, I like the use of an 
understandable define.

On 2019-11-05 2:13 a.m., Matti Vaittinen wrote:
> t's hard for occasional GPIO code reader/writer to know if values 0/1
> equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and
> GPIO_LINE_DIRECTION_OUT to help them out.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Acked-by: Scott Branden <scott.branden@...adcom.com>
> ---
>   drivers/gpio/gpio-bcm-kona.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
> index 9fa6d3a967d2..4122683eb1f9 100644
> --- a/drivers/gpio/gpio-bcm-kona.c
> +++ b/drivers/gpio/gpio-bcm-kona.c
> @@ -127,7 +127,7 @@ static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio)
>   	u32 val;
>   
>   	val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK;
> -	return !!val;
> +	return val ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
>   }
>   
>   static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
> @@ -144,7 +144,7 @@ static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
>   	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
>   
>   	/* this function only applies to output pin */
> -	if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
> +	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN)
>   		goto out;
>   
>   	reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
> @@ -170,7 +170,7 @@ static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
>   	reg_base = kona_gpio->reg_base;
>   	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
>   
> -	if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
> +	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN)
>   		reg_offset = GPIO_IN_STATUS(bank_id);
>   	else
>   		reg_offset = GPIO_OUT_STATUS(bank_id);