linux-kernel - Re: [PATCH v3 02/10] pinctrl: Ingenic: Add support for read the pin configuration of X1830.

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Date:   Mon, 22 Mar 2021 17:58:46 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <zhouyanjie@...yeetech.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org,
        linux-mips@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        hns@...delico.com, paul@...die.org.uk, andy.shevchenko@...il.com,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        sernia.zhou@...mail.com
Subject: Re: [PATCH v3 02/10] pinctrl: Ingenic: Add support for read the pin
 configuration of X1830.



Le mer. 17 mars 2021 à 17:57, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> Add X1830 support in "ingenic_pinconf_get()", so that it can read the
> configuration of X1830 SoC correctly.
> 
> Fixes: d7da2a1e4e08 ("pinctrl: Ingenic: Add pinctrl driver for 
> X1830.")
> 
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
> 
> Notes:
>     v2:
>     New patch.
> 
>     v2->v3:
>     1.Add fixes tag.
>     2.Adjust the code, simplify the ingenic_pinconf_get() function.
> 
>  drivers/pinctrl/pinctrl-ingenic.c | 38 
> ++++++++++++++++++++++++++++++--------
>  1 file changed, 30 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-ingenic.c 
> b/drivers/pinctrl/pinctrl-ingenic.c
> index 05dfa0a..1d43b98 100644
> --- a/drivers/pinctrl/pinctrl-ingenic.c
> +++ b/drivers/pinctrl/pinctrl-ingenic.c
> @@ -2109,26 +2109,48 @@ static int ingenic_pinconf_get(struct 
> pinctrl_dev *pctldev,
>  	enum pin_config_param param = pinconf_to_config_param(*config);
>  	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
>  	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
> -	bool pull;
> +	unsigned int bias;
> +	bool pull, pullup, pulldown;
> 
> -	if (jzpc->info->version >= ID_JZ4770)
> -		pull = !ingenic_get_pin_config(jzpc, pin, JZ4770_GPIO_PEN);
> -	else
> -		pull = !ingenic_get_pin_config(jzpc, pin, JZ4740_GPIO_PULL_DIS);
> +	if (jzpc->info->version >= ID_X1830) {
> +		unsigned int half = PINS_PER_GPIO_CHIP / 2;
> +		unsigned int idxh = pin % half * 2;

I had to look up operator precedence in C, '*' and '%' have the same 
priority so this reads left-to-right.

I'd suggest adding parentheses around the '%' to make it more obvious.

With that:

Reviewed-by: Paul Cercueil <paul@...pouillou.net>

Cheers,
-Paul

> +
> +		if (idx < half)
> +			regmap_read(jzpc->map, offt * jzpc->info->reg_offset +
> +					X1830_GPIO_PEL, &bias);
> +		else
> +			regmap_read(jzpc->map, offt * jzpc->info->reg_offset +
> +					X1830_GPIO_PEH, &bias);
> +
> +		bias = (bias >> idxh) & (GPIO_PULL_UP | GPIO_PULL_DOWN);
> +
> +		pullup = (bias == GPIO_PULL_UP) && (jzpc->info->pull_ups[offt] & 
> BIT(idx));
> +		pulldown = (bias == GPIO_PULL_DOWN) && 
> (jzpc->info->pull_downs[offt] & BIT(idx));
> +
> +	} else {
> +		if (jzpc->info->version >= ID_JZ4770)
> +			pull = !ingenic_get_pin_config(jzpc, pin, JZ4770_GPIO_PEN);
> +		else
> +			pull = !ingenic_get_pin_config(jzpc, pin, JZ4740_GPIO_PULL_DIS);
> +
> +		pullup = pull && (jzpc->info->pull_ups[offt] & BIT(idx));
> +		pulldown = pull && (jzpc->info->pull_downs[offt] & BIT(idx));
> +	}
> 
>  	switch (param) {
>  	case PIN_CONFIG_BIAS_DISABLE:
> -		if (pull)
> +		if (pullup || pulldown)
>  			return -EINVAL;
>  		break;
> 
>  	case PIN_CONFIG_BIAS_PULL_UP:
> -		if (!pull || !(jzpc->info->pull_ups[offt] & BIT(idx)))
> +		if (!pullup)
>  			return -EINVAL;
>  		break;
> 
>  	case PIN_CONFIG_BIAS_PULL_DOWN:
> -		if (!pull || !(jzpc->info->pull_downs[offt] & BIT(idx)))
> +		if (!pulldown)
>  			return -EINVAL;
>  		break;
> 
> --
> 2.7.4
>