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pinctrl/gpio: Take MUX usage into account

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The user space like gpioinfo only see the GPIO usage but not the
MUX usage (e.g. I2C or SPI usage) of a pin. As a user we want
to know which pin is free/safe to use. So take the MUX usage of
strict pinmux controllers into account to get a more realistic
view for ioctl GPIO_GET_LINEINFO_IOCTL.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Tested-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Ramon Fried <rfried.dev@gmail.com>
Link: https://lore.kernel.org/r/20190814110035.13451-1-ramon.fried@linux.intel.com
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stefan Wahren
2019-08-14 14:00:35 +03:00
committed by Linus Walleij
parent 2dc889a884
commit 472a61e777
5 changed files with 68 additions and 1 deletions
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28
drivers/pinctrl/core.c
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@@ -736,6 +736,34 @@ int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
return -EINVAL;
}
bool pinctrl_gpio_can_use_line(unsigned gpio)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
bool result;
int pin;
/*
* Try to obtain GPIO range, if it fails
* we're probably dealing with GPIO driver
* without a backing pin controller - bail out.
*/
if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range))
return true;
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gpio);
result = pinmux_can_be_used_for_gpio(pctldev, pin);
mutex_unlock(&pctldev->mutex);
return result;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line);
/**
* pinctrl_gpio_request() - request a single pin to be used as GPIO
* @gpio: the GPIO pin number from the GPIO subsystem number space