linux-kernel - Re: [PATCH v2 4/6] gpio: exar: Fix reading of directions and values

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Date:   Thu, 18 May 2017 18:28:25 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH v2 4/6] gpio: exar: Fix reading of directions and values

On Thu, May 18, 2017 at 5:59 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> First, the logic for translating a register bit to the return code of
> exar_get_direction and exar_get_value were wrong. And second, there was
> a flip regarding the register bank in exar_get_direction.
>

FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  drivers/gpio/gpio-exar.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
> index 4ed1f8bdeda7..d8b6296c11de 100644
> --- a/drivers/gpio/gpio-exar.c
> +++ b/drivers/gpio/gpio-exar.c
> @@ -69,7 +69,7 @@ static int exar_get(struct gpio_chip *chip, unsigned int reg)
>         value = readb(exar_gpio->regs + reg);
>         mutex_unlock(&exar_gpio->lock);
>
> -       return !!value;
> +       return value;
>  }
>
>  static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
> @@ -79,7 +79,7 @@ static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
>         int val;
>
>         addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
> -       val = exar_get(chip, addr) >> (offset % 8);
> +       val = exar_get(chip, addr) & BIT(offset % 8);
>
>         return !!val;
>  }
> @@ -90,8 +90,8 @@ static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
>         unsigned int addr;
>         int val;
>
> -       addr = bank ? EXAR_OFFSET_MPIOLVL_LO : EXAR_OFFSET_MPIOLVL_HI;
> -       val = exar_get(chip, addr) >> (offset % 8);
> +       addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
> +       val = exar_get(chip, addr) & BIT(offset % 8);
>
>         return !!val;
>  }
> --
> 2.12.0
>



-- 
With Best Regards,
Andy Shevchenko