linux-kernel - Re: [PATCH 1/3] pinctrl: at91-pio4: Enable Push-Pull configuration

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Message-ID: <c85c1f09-64c3-c8d4-7e8f-985665d1622e@microchip.com>
Date:   Thu, 18 May 2023 05:40:01 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Ryan.Wanner@...rochip.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linus.walleij@...aro.org>, <Ludovic.Desroches@...rochip.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 1/3] pinctrl: at91-pio4: Enable Push-Pull configuration

On 17.05.2023 14:54, Ryan.Wanner@...rochip.com wrote:
> From: Ryan Wanner <Ryan.Wanner@...rochip.com>
> 
> Enable push-pull configuration. Remove integer value argument from
> open-drain configuration as it is discarded when pinconf function is
> called from gpiolib.

AFAICT it is still taken into account when passed tough drive-open-drain DT
property but at the moment there are no device trees using this property.

> Add push-pull do debug and get functions.
> 
> Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
> ---
>  drivers/pinctrl/pinctrl-at91-pio4.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> index 2fe40acb6a3e..3c39d62bbc3c 100644
> --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> @@ -762,6 +762,11 @@ static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
>  			return -EINVAL;
>  		arg = 1;
>  		break;
> +	case PIN_CONFIG_DRIVE_PUSH_PULL:
> +		if (res & ATMEL_PIO_OPD_MASK)
> +			return -EINVAL;
> +		arg = 1;
> +		break;
>  	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
>  		if (!(res & ATMEL_PIO_SCHMITT_MASK))
>  			return -EINVAL;
> @@ -827,10 +832,10 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
>  			conf &= (~ATMEL_PIO_PUEN_MASK);
>  			break;
>  		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> -			if (arg == 0)
> -				conf &= (~ATMEL_PIO_OPD_MASK);
> -			else
> -				conf |= ATMEL_PIO_OPD_MASK;
> +			conf |= ATMEL_PIO_OPD_MASK;
> +			break;
> +		case PIN_CONFIG_DRIVE_PUSH_PULL:
> +			conf &= (~ATMEL_PIO_OPD_MASK);
>  			break;
>  		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
>  			if (arg == 0)
> @@ -948,6 +953,8 @@ static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
>  		seq_printf(s, "%s ", "debounce");
>  	if (conf & ATMEL_PIO_OPD_MASK)
>  		seq_printf(s, "%s ", "open-drain");
> +	if (!(conf & ATMEL_PIO_OPD_MASK))

else would fit better here.

> +		seq_printf(s, "%s ", "push-pull");
>  	if (conf & ATMEL_PIO_SCHMITT_MASK)
>  		seq_printf(s, "%s ", "schmitt");
>  	if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))