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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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6
include/linux/pinctrl/consumer.h
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@@ -24,6 +24,7 @@ struct device;
#ifdef CONFIG_PINCTRL
/* External interface to pin control */
extern bool pinctrl_gpio_can_use_line(unsigned gpio);
extern int pinctrl_gpio_request(unsigned gpio);
extern void pinctrl_gpio_free(unsigned gpio);
extern int pinctrl_gpio_direction_input(unsigned gpio);
@@ -61,6 +62,11 @@ static inline int pinctrl_pm_select_idle_state(struct device *dev)
#else /* !CONFIG_PINCTRL */
static inline bool pinctrl_gpio_can_use_line(unsigned gpio)
{
return true;
}
static inline int pinctrl_gpio_request(unsigned gpio)
{
return 0;