linux-kernel - Re: [PATCH v8 2/6] pinctrl: mediatek: Supporting driving setting without mapping current to register value

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Message-ID: <CAGp9LzpuuOWuhK9GfKnQNrTxM_kH3c8vYBt154kGY8jy=5zc8g@mail.gmail.com>
Date:   Wed, 22 Jan 2020 11:41:37 -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 2/6] pinctrl: mediatek: Supporting driving setting
 without mapping current to register value

On Tue, Jan 21, 2020 at 10:53 PM <light.hsieh@...iatek.com> wrote:
>
> From: Light Hsieh <light.hsieh@...iatek.com>
>
> MediaTek's smartphone project actual usage does need to know current value
> (in mA) in procedure of finding the best driving setting.
> The steps in the procedure is like as follow:
>
> 1. set driving setting field in setting register as 0, measure waveform,
>    perform test, and etc.
> 2. set driving setting field in setting register as 1, measure waveform,
>    perform test, and etc.
> ...
> n. set driving setting field in setting register as n-1, measure
>    waveform, perform test, and etc.
> Check the results of steps 1~n and adopt the setting that get best result.
>
> This procedure does need to know the mapping between current to register
> value.
> Therefore, setting driving without mapping current is more practical for
> MediaTek's smartphone usage.
>
> Signed-off-by: Light Hsieh <light.hsieh@...iatek.com>

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

> ---
>  drivers/pinctrl/mediatek/pinctrl-mt6765.c        |  4 ++--
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 12 ++++++++++++
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h |  5 +++++
>  3 files changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mt6765.c b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> index 32451e8..1212264 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> @@ -1077,8 +1077,8 @@
>         .bias_disable_get = mtk_pinconf_bias_disable_get,
>         .bias_set = mtk_pinconf_bias_set,
>         .bias_get = mtk_pinconf_bias_get,
> -       .drive_set = mtk_pinconf_drive_set_rev1,
> -       .drive_get = mtk_pinconf_drive_get_rev1,
> +       .drive_set = mtk_pinconf_drive_set_raw,
> +       .drive_get = mtk_pinconf_drive_get_raw,
>         .adv_pull_get = mtk_pinconf_adv_pull_get,
>         .adv_pull_set = mtk_pinconf_adv_pull_set,
>  };
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> index d63e05e..2247eae 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> @@ -608,6 +608,18 @@ int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
>         return 0;
>  }
>
> +int mtk_pinconf_drive_set_raw(struct mtk_pinctrl *hw,
> +                              const struct mtk_pin_desc *desc, u32 arg)
> +{
> +       return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV, arg);
> +}
> +
> +int mtk_pinconf_drive_get_raw(struct mtk_pinctrl *hw,
> +                              const struct mtk_pin_desc *desc, int *val)
> +{
> +       return mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, val);
> +}
> +
>  int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
>                              const struct mtk_pin_desc *desc, bool pullup,
>                              u32 arg)
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> index 1b7da42..75d0e07 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> @@ -288,6 +288,11 @@ int mtk_pinconf_drive_set_rev1(struct mtk_pinctrl *hw,
>  int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
>                                const struct mtk_pin_desc *desc, int *val);
>
> +int mtk_pinconf_drive_set_raw(struct mtk_pinctrl *hw,
> +                              const struct mtk_pin_desc *desc, u32 arg);
> +int mtk_pinconf_drive_get_raw(struct mtk_pinctrl *hw,
> +                              const struct mtk_pin_desc *desc, int *val);
> +
>  int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
>                              const struct mtk_pin_desc *desc, bool pullup,
>                              u32 arg);
> --
> 1.8.1.1.dirty