linux-kernel - Re: [PATCH v2 4/4] pintcrl: support bias-disable of generic and special pins simultaneously

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Message-ID: <1519803217.8089.31.camel@mtkswgap22>
Date:   Wed, 28 Feb 2018 15:33:37 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Zhiyong Tao <zhiyong.tao@...iatek.com>
CC:     <robh+dt@...nel.org>, <linus.walleij@...aro.org>,
        <mark.rutland@....com>, <matthias.bgg@...il.com>,
        <devicetree@...r.kernel.org>, <hongkun.cao@...iatek.com>,
        <srv_heupstream@...iatek.com>, <linux-gpio@...r.kernel.org>,
        <biao.huang@...iatek.com>, <erin.lo@...iatek.com>,
        <liguo.zhang@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <hongzhou.yang@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
        <yingjoe.chen@...iatek.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 4/4] pintcrl: support bias-disable of generic and
 special pins simultaneously

On Mon, 2018-02-26 at 16:34 +0800, Zhiyong Tao wrote:
> For generic pins, parameter "arg" is 0 or 1.
> For special pins, bias-disable is set by R0R1,
> so we need transmited "00" to set bias-disable
> When we set "bias-disable" as high-z property,
> the parameter should be "MTK_PUPD_SET_R1R0_00".
> 
> Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
> ---
>  drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> index 3cf384f..e88ba04 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> @@ -301,8 +301,17 @@ static int mtk_pconf_set_pull_select(struct mtk_pinctrl *pctl,
>  	 * resistor bit, so we need this special handle.
>  	 */
>  	if (pctl->devdata->spec_pull_set) {
> -		ret = pctl->devdata->spec_pull_set(mtk_get_regmap(pctl, pin),
> -			pin, pctl->devdata->port_align, isup, arg);
> +		if (enable) {
> +			ret = pctl->devdata->spec_pull_set(
> +				mtk_get_regmap(pctl, pin), pin,
> +				pctl->devdata->port_align, isup,
> +				arg);
> +		} else {
> +			ret = pctl->devdata->spec_pull_set(
> +				mtk_get_regmap(pctl, pin), pin,
> +				pctl->devdata->port_align, isup,
> +				MTK_PUPD_SET_R1R0_00);
> +		}


it looks like you can use as following snippet with reusing original
logic and less effort on maintaining these common code (?)


if (pctl->devdata->spec_pull_set) {
	+ if (!enable)
	+ 	arg = MTK_PUPD_SET_R1R0_00;

	ret = pctl->devdata->spec_pull_set(mtk_get_regmap(pctl, pin),
		pin, pctl->devdata->port_align, isup, arg);


Also, it's better to add more comments to such kind of special path for
allowing future SoCs to follow and extend more easily.

>  		if (!ret)
>  			return 0;
>  	}