linux-kernel - Re: [PATCH] pinctrl: at91-pio4: Fix slew rate disablement

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Message-ID: <b85dae59-d3fa-33fe-9b38-b441169d0765@microchip.com>
Date:   Fri, 9 Apr 2021 09:59:42 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Tudor.Ambarus@...rochip.com>, <Ludovic.Desroches@...rochip.com>,
        <linus.walleij@...aro.org>
CC:     <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: at91-pio4: Fix slew rate disablement

On 09.04.2021 11:25, Tudor Ambarus wrote:
> The slew rate was enabled by default for each configuration of the
> pin. In case the pin had more than one configuration, even if
> we set the slew rate as disabled in the device tree, the next pin
> configuration would set again the slew rate enabled by default,
> overwriting the slew rate disablement.
> Instead of enabling the slew rate by default for each pin configuration,
> enable the slew rate by default just once per pin, regardless of the
> number of configurations. This way the slew rate disablement will also
> work for cases where pins have multiple configurations.
> 
> Fixes: 440b144978ba ("pinctrl: at91-pio4: add support for slew-rate")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>


> ---
>  drivers/pinctrl/pinctrl-at91-pio4.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> index a5d328808e4c..4c01d8471ffa 100644
> --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> @@ -801,6 +801,10 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
>  
>  	conf = atmel_pin_config_read(pctldev, pin_id);
>  
> +	/* Keep slew rate enabled by default. */
> +	if (atmel_pioctrl->slew_rate_support)
> +		conf |= ATMEL_PIO_SR_MASK;
> +
>  	for (i = 0; i < num_configs; i++) {
>  		unsigned int param = pinconf_to_config_param(configs[i]);
>  		unsigned int arg = pinconf_to_config_argument(configs[i]);
> @@ -808,10 +812,6 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
>  		dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
>  			__func__, pin_id, configs[i]);
>  
> -		/* Keep slew rate enabled by default. */
> -		if (atmel_pioctrl->slew_rate_support)
> -			conf |= ATMEL_PIO_SR_MASK;
> -
>  		switch (param) {
>  		case PIN_CONFIG_BIAS_DISABLE:
>  			conf &= (~ATMEL_PIO_PUEN_MASK);
>