xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

pinctrl: Allow configuration of pins from gpiolib based drivers

Browse Source 
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.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Mika Westerberg
2017-01-23 15:34:33 +03:00
committed by Linus Walleij
parent 58957d2edf
commit 15381bc7c7
4 changed files with 56 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/pinctrl/core.c
View File

@@ -688,6 +688,35 @@ int pinctrl_gpio_direction_output(unsigned gpio)
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
/**
* pinctrl_gpio_set_config() - Apply config to given GPIO pin
* @gpio: the GPIO pin number from the GPIO subsystem number space
* @config: the configuration to apply to the GPIO
*
* This function should *ONLY* be used from gpiolib-based GPIO drivers, if
* they need to call the underlying pin controller to change GPIO config
* (for example set debounce time).
*/
int pinctrl_gpio_set_config(unsigned gpio, unsigned long config)
{
unsigned long configs[] = { config };
struct pinctrl_gpio_range *range;
struct pinctrl_dev *pctldev;
int ret, pin;
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret)
return ret;
mutex_lock(&pctldev->mutex);
pin = gpio_to_pin(range, gpio);
ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
mutex_unlock(&pctldev->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
static struct pinctrl_state *find_state(struct pinctrl *p,
const char *name)
{