linux-kernel - Re: [PATCH v8 4/6] pinctrl: mediatek: Refine mtk_pinconf

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Date:   Wed, 22 Jan 2020 11:42:59 -0800
From:   Sean Wang <sean.wang@...nel.org>
To:     Light Hsieh <light.hsieh@...iatek.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, kuohong.wang@...iatek.com
Subject: Re: [PATCH v8 4/6] pinctrl: mediatek: Refine mtk_pinconf_get()

On Tue, Jan 21, 2020 at 10:53 PM <light.hsieh@...iatek.com> wrote:
>
> From: Light Hsieh <light.hsieh@...iatek.com>
>
> Correct cases for PIN_CONFIG_SLEW_RATE, PIN_CONFIG_INPUT_SCHMITT_ENABLE,
> and PIN_CONFIG_OUTPUT_ENABLE -
> Use variable ret to receive value in mtk_hw_get_value() (instead of
> variable val) since pinconf_to_config_packed() at end of this function
> use variable ret to pack config value.
>
> Signed-off-by: Light Hsieh <light.hsieh@...iatek.com>

Acked-by: Sean Wang <sean.wang@...nel.org>

> ---
>  drivers/pinctrl/mediatek/pinctrl-paris.c | 40 ++++++++++++--------------------
>  1 file changed, 15 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index 2f07500..d09a726 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -78,7 +78,7 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>  {
>         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
>         u32 param = pinconf_to_config_param(*config);
> -       int val, val2, err, reg, ret = 1;
> +       int err, reg, ret = 1;
>         const struct mtk_pin_desc *desc;
>
>         if (pin >= hw->soc->npins) {
> @@ -107,17 +107,11 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>                         err = -ENOTSUPP;
>                 break;
>         case PIN_CONFIG_SLEW_RATE:
> -               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &val);
> -               if (err)
> -                       return err;
> -
> -               if (!val)
> -                       return -EINVAL;
> -
> +               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &ret);
>                 break;
>         case PIN_CONFIG_INPUT_ENABLE:
>         case PIN_CONFIG_OUTPUT_ENABLE:
> -               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
> +               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
>                 if (err)
>                         goto out;
>                 /*     CONFIG     Current direction return value
> @@ -128,20 +122,22 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>                  *                     input        1 (= reverse HW value)
>                  */
>                 if (param == PIN_CONFIG_INPUT_ENABLE)
> -                       val = !val;
> +                       ret = !ret;
>
>                 break;
>         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> -               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
> +               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
>                 if (err)
> -                       return err;
> -
> -               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &val2);
> -               if (err)
> -                       return err;
> +                       goto out;
> +               /* return error when in output mode
> +                * because schmitt trigger only work in input mode
> +                */
> +               if (ret) {
> +                       err = -EINVAL;
> +                       goto out;
> +               }
>
> -               if (val || !val2)
> -                       return -EINVAL;
> +               err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret);
>
>                 break;
>         case PIN_CONFIG_DRIVE_STRENGTH:
> @@ -154,13 +150,7 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>         case MTK_PIN_CONFIG_RDSEL:
>                 reg = (param == MTK_PIN_CONFIG_TDSEL) ?
>                        PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
> -
> -               err = mtk_hw_get_value(hw, desc, reg, &val);
> -               if (err)
> -                       return err;
> -
> -               ret = val;
> -
> +               err = mtk_hw_get_value(hw, desc, reg, &ret);
>                 break;
>         case MTK_PIN_CONFIG_PU_ADV:
>         case MTK_PIN_CONFIG_PD_ADV:
> --
> 1.8.1.1.dirty