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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-09-08 11:23:18 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-09-10 08:57:01 +0200 |
| commit | 4f8183ae7092fe3a6985b9a10a5d7f3efa01b097 (patch) | |
| tree | 699af6a15cdbe8a094134c991395686fb04f6600 /Documentation/driver-api/gpio | |
| parent | 461c1a7d4733d1dfd5c47b040cf32a5e7eefbc6c (diff) | |
| download | linux-4f8183ae7092fe3a6985b9a10a5d7f3efa01b097.tar.gz | |
gpio/driver.rst: document gpiochip_disable/enable_irq()
Document these new functions.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/driver-api/gpio')
| -rw-r--r-- | Documentation/driver-api/gpio/driver.rst | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/Documentation/driver-api/gpio/driver.rst b/Documentation/driver-api/gpio/driver.rst index cbe0242842d1..a6c14ff0c54f 100644 --- a/Documentation/driver-api/gpio/driver.rst +++ b/Documentation/driver-api/gpio/driver.rst @@ -374,7 +374,28 @@ When implementing an irqchip inside a GPIO driver, these two functions should typically be called in the .startup() and .shutdown() callbacks from the irqchip. -When using the gpiolib irqchip helpers, these callback are automatically +When using the gpiolib irqchip helpers, these callbacks are automatically +assigned. + + +Disabling and enabling IRQs +--------------------------- +When a GPIO is used as an IRQ signal, then gpiolib also needs to know if +the IRQ is enabled or disabled. In order to inform gpiolib about this, +a driver should call:: + + void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) + +This allows drivers to drive the GPIO as an output while the IRQ is +disabled. When the IRQ is enabled again, a driver should call:: + + void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) + +When implementing an irqchip inside a GPIO driver, these two functions should +typically be called in the .irq_disable() and .irq_enable() callbacks from the +irqchip. + +When using the gpiolib irqchip helpers, these callbacks are automatically assigned. Real-Time compliance for GPIO IRQ chips |