linux-kernel - Re: [PATCH v2 2/6] pinctrl: Ingenic: Add support for read the pin configuration of X1830.

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Date:   Fri, 12 Mar 2021 13:31:45 +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, dongsheng.qiu@...enic.com,
        aric.pzqi@...enic.com, sernia.zhou@...mail.com
Subject: Re: [PATCH v2 2/6] pinctrl: Ingenic: Add support for read the pin
 configuration of X1830.

Hi Zhou,

Le jeu. 11 mars 2021 à 23:21, 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.
> 
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>

This is a fix, so it needs a Fixes: tag, and you need to Cc 
linux-stable.

> ---
> 
> Notes:
>     v2:
>     New patch.
> 
>  drivers/pinctrl/pinctrl-ingenic.c | 76 
> +++++++++++++++++++++++++++++----------
>  1 file changed, 57 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-ingenic.c 
> b/drivers/pinctrl/pinctrl-ingenic.c
> index 05dfa0a..0a88aab 100644
> --- a/drivers/pinctrl/pinctrl-ingenic.c
> +++ b/drivers/pinctrl/pinctrl-ingenic.c
> @@ -2109,31 +2109,69 @@ 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;
> +	unsigned int bias;
>  	bool pull;
> 
> -	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;
> 
> -	switch (param) {
> -	case PIN_CONFIG_BIAS_DISABLE:
> -		if (pull)
> -			return -EINVAL;
> -		break;
> +		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);
> 
> -	case PIN_CONFIG_BIAS_PULL_UP:
> -		if (!pull || !(jzpc->info->pull_ups[offt] & BIT(idx)))
> -			return -EINVAL;
> -		break;
> +		bias = (bias >> idxh) & 3;

You can do:

u32 mask = GENMASK(idxh + 1, idxh);

bias = FIELD_GET(mask, bias);

(macros in <linux/bitfield.h>)

> 
> -	case PIN_CONFIG_BIAS_PULL_DOWN:
> -		if (!pull || !(jzpc->info->pull_downs[offt] & BIT(idx)))
> -			return -EINVAL;
> -		break;
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_DISABLE:
> +			if (bias)
> +				return -EINVAL;
> +			break;
> 
> -	default:
> -		return -ENOTSUPP;
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +			if ((bias != PIN_CONFIG_BIAS_PULL_UP) ||
> +					!(jzpc->info->pull_ups[offt] & BIT(idx)))

"bias" is a 2-bit value (because of the & 3 mask), and 
PIN_CONFIG_BIAS_PULL_UP == 5.

So this clearly won't work. You are comparing hardware values with 
public API enums.

> +				return -EINVAL;
> +			break;
> +
> +		case PIN_CONFIG_BIAS_PULL_DOWN:
> +			if ((bias != PIN_CONFIG_BIAS_PULL_DOWN) ||
> +					!(jzpc->info->pull_downs[offt] & BIT(idx)))
> +				return -EINVAL;
> +			break;
> +
> +		default:
> +			return -ENOTSUPP;
> +		}
> +
> +	} 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);

I think you can keep the switch outside the if/else block, if you use 
pullup/pulldown variables.

These can be initialized (in the non-X1830 case) to:

pullup = pull && (jzpc->info->pull_ups[offt] & BIT(idx));
pulldown = pull && (jzpc->info->pull_downs[offt] & BIT(idx));

In the X1830 case you'd initialize these variables from 'bias'.

> +
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_DISABLE:
> +			if (pull)

Here would change to 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)

Cheers,
-Paul

> +				return -EINVAL;
> +			break;
> +
> +		default:
> +			return -ENOTSUPP;
> +		}
>  	}
> 
>  	*config = pinconf_to_config_packed(param, 1);
> --
> 2.7.4
>