linux-kernel - Re: [PATCH] pinctrl: intel: Implement intel_gpio_get

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Message-ID: <3585081b-70af-5c31-08c0-84e96b6055bc@emutex.com>
Date:   Tue, 6 Mar 2018 14:31:20 +0000
From:   Javier Arteaga <javier@...tex.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: intel: Implement intel_gpio_get_direction
 callback

(Fix Andy's Cc: - apologies)

On 06/03/2018 13:42, Javier Arteaga wrote:
> Allows querying GPIO direction from the pad config register.
> If the pad is not in GPIO mode, return an error.
> 
> Signed-off-by: Javier Arteaga <javier@...tex.com>
> ---
> This is needed by the drivers for the UP Squared board, an APL-based
> platform. (For now, these drivers are out-of-tree.)
> 
> An earlier version of this patch was reviewed some time ago by Andy
> Shevchenko outside of the mailing lists:
> <https://github.com/emutex/ubilinux-kernel/commit/708a776f2ffd1b1c>
> 
>  drivers/pinctrl/intel/pinctrl-intel.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
> index 96e73e30204e..1e24a6b8a64e 100644
> --- a/drivers/pinctrl/intel/pinctrl-intel.c
> +++ b/drivers/pinctrl/intel/pinctrl-intel.c
> @@ -788,6 +788,24 @@ static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
>  	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
>  }
>  
> +static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
> +{
> +	struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
> +	void __iomem *reg;
> +	u32 padcfg0;
> +
> +	reg = intel_get_padcfg(pctrl, offset, PADCFG0);
> +	if (!reg)
> +		return -EINVAL;
> +
> +	padcfg0 = readl(reg);
> +
> +	if (padcfg0 & PADCFG0_PMODE_MASK)
> +		return -EINVAL;
> +
> +	return !!(padcfg0 & PADCFG0_GPIOTXDIS);
> +}
> +
>  static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
>  {
>  	return pinctrl_gpio_direction_input(chip->base + offset);
> @@ -804,6 +822,7 @@ static const struct gpio_chip intel_gpio_chip = {
>  	.owner = THIS_MODULE,
>  	.request = gpiochip_generic_request,
>  	.free = gpiochip_generic_free,
> +	.get_direction = intel_gpio_get_direction,
>  	.direction_input = intel_gpio_direction_input,
>  	.direction_output = intel_gpio_direction_output,
>  	.get = intel_gpio_get,
>