linux-kernel - Re: [PATCH v7 2/6] Supporting driving setting without mapping current to register value

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Date:   Sat, 4 Jan 2020 12:48:01 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Light Hsieh <light.hsieh@...iatek.com>
Cc:     linus.walleij@...aro.org, linux-mediatek@...ts.infradead.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        sean.wang@...nel.org, kuohong.wang@...iatek.com
Subject: Re: [PATCH v7 2/6] Supporting driving setting without mapping
 current to register value

On Tue, Dec 31, 2019 at 09:41:43PM +0800, Light Hsieh wrote:
> MediaTek's smarphone 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:
smartphone ?

> 
> 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.
> 
> Change-Id: I8bd6a2cecc0af650923704589b5b90097b0ff77e
> ---
>  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