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Commit 05f479bf authored by Charles Keepax's avatar Charles Keepax Committed by Linus Walleij
Browse files

gpio: Add new flags to control sleep status of GPIOs 



Add new flags to allow users to specify that they are not concerned with
the status of GPIOs whilst in a sleep/low power state.

Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent f9e3a419

drivers/gpio/gpiolib-of.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -153,6 +153,9 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, 
			*flags |= GPIO_OPEN_SOURCE;

			*flags |= GPIO_OPEN_SOURCE;

	}

	}





	if (of_flags & OF_GPIO_SLEEP_MAY_LOOSE_VALUE)

		*flags |= GPIO_SLEEP_MAY_LOOSE_VALUE;



	return desc;

	return desc;

}

}

drivers/gpio/gpiolib.c

+12 −0
Original line number Original line Diff line number Diff line
@@ -2869,6 +2869,16 @@ bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) 
}

}

EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);

EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);





bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset)

{

	if (offset >= chip->ngpio)

		return false;



	return !test_bit(FLAG_SLEEP_MAY_LOOSE_VALUE,

			 &chip->gpiodev->descs[offset].flags);

}

EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent);



/**

/**

 * gpiod_get_raw_value_cansleep() - return a gpio's raw value

 * gpiod_get_raw_value_cansleep() - return a gpio's raw value

 * @desc: gpio whose value will be returned

 * @desc: gpio whose value will be returned
@@ -3225,6 +3235,8 @@ static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, 
		set_bit(FLAG_OPEN_DRAIN, &desc->flags);

		set_bit(FLAG_OPEN_DRAIN, &desc->flags);

	if (lflags & GPIO_OPEN_SOURCE)

	if (lflags & GPIO_OPEN_SOURCE)

		set_bit(FLAG_OPEN_SOURCE, &desc->flags);

		set_bit(FLAG_OPEN_SOURCE, &desc->flags);

	if (lflags & GPIO_SLEEP_MAY_LOOSE_VALUE)

		set_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, &desc->flags);





	/* No particular flag request, return here... */

	/* No particular flag request, return here... */

	if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {

	if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {

drivers/gpio/gpiolib.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -190,6 +190,7 @@ struct gpio_desc { 
#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */

#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */

#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */

#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */

#define FLAG_IS_HOGGED	11	/* GPIO is hogged */

#define FLAG_IS_HOGGED	11	/* GPIO is hogged */

#define FLAG_SLEEP_MAY_LOOSE_VALUE 12	/* GPIO may loose value in sleep */





	/* Connection label */

	/* Connection label */

	const char		*label;

	const char		*label;

include/dt-bindings/gpio/gpio.h

+4 −0
Original line number Original line Diff line number Diff line
@@ -28,4 +28,8 @@ 
#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)

#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)

#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)

#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)





/* Bit 3 express GPIO suspend/resume persistence */

#define GPIO_SLEEP_MAINTAIN_VALUE 0

#define GPIO_SLEEP_MAY_LOOSE_VALUE 8



#endif
 
#endif

include/linux/gpio/driver.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -213,6 +213,9 @@ bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset); 
bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset);

bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset);

bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset);

bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset);





/* Sleep persistence inquiry for drivers */

bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset);



/* get driver data */

/* get driver data */

void *gpiochip_get_data(struct gpio_chip *chip);

void *gpiochip_get_data(struct gpio_chip *chip);