linux-kernel - Re: [PATCH v2 2/5] gpio: loongson1: Use readl() & writel()

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Date:   Mon, 6 Mar 2023 10:30:28 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Keguang Zhang <keguang.zhang@...il.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH v2 2/5] gpio: loongson1: Use readl() & writel()

On Thu, Mar 2, 2023 at 1:52 PM Keguang Zhang <keguang.zhang@...il.com> wrote:
>
> This patch replace __raw_readl() & __raw_writel() with readl() & writel().
>

Please say WHY you're doing this.

Bart

> Signed-off-by: Keguang Zhang <keguang.zhang@...il.com>
> ---
> V1 -> V2: Split this change to a separate patch
> ---
>  drivers/gpio/gpio-loongson1.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpio/gpio-loongson1.c b/drivers/gpio/gpio-loongson1.c
> index 8862c9ea0d41..b6c11caa3ade 100644
> --- a/drivers/gpio/gpio-loongson1.c
> +++ b/drivers/gpio/gpio-loongson1.c
> @@ -23,8 +23,8 @@ static int ls1x_gpio_request(struct gpio_chip *gc, unsigned int offset)
>         unsigned long flags;
>
>         raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
> -       __raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) | BIT(offset),
> -                    gpio_reg_base + GPIO_CFG);
> +       writel(readl(gpio_reg_base + GPIO_CFG) | BIT(offset),
> +              gpio_reg_base + GPIO_CFG);
>         raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
>
>         return 0;
> @@ -35,8 +35,8 @@ static void ls1x_gpio_free(struct gpio_chip *gc, unsigned int offset)
>         unsigned long flags;
>
>         raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
> -       __raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) & ~BIT(offset),
> -                    gpio_reg_base + GPIO_CFG);
> +       writel(readl(gpio_reg_base + GPIO_CFG) & ~BIT(offset),
> +              gpio_reg_base + GPIO_CFG);
>         raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
>  }
>
> --
> 2.34.1
>