linux-kernel - Re: [PATCH 2/3] pinctrl: Allow configuration of pins from gpiolib based drivers

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Date:   Thu, 19 Jan 2017 14:11:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Alexandre Courbot <gnurou@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] pinctrl: Allow configuration of pins from gpiolib
 based drivers

On Thu, 2017-01-19 at 12:48 +0300, Mika Westerberg wrote:
> When a GPIO driver is backed by a pinctrl driver the GPIO driver
> sometimes needs to call the pinctrl driver to configure certain
> things,
> like whether the pin is used as input or output. In addition to this
> there are other configurations applicable to GPIOs such as setting
> debounce time of the GPIO.
> 
> To support this we introduce a new function pinctrl_gpio_set_config()
> that can be used by gpiolib based driver to pass configuration
> requests
> to the backing pinctrl driver.


> +	mutex_lock(&pctldev->mutex);
> +	pin = gpio_to_pin(range, gpio);
> +	ret = pinconf_set_config(pctldev, pin, configs,
> ARRAY_SIZE(configs));
> +	mutex_unlock(&pctldev->mutex);

Does gpio_to_pin() require to be under lock?

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy