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gpiolib: Make it possible to exclude GPIOs from IRQ domain

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When using GPIO irqchip helpers to setup irqchip for a gpiolib based
driver, it is not possible to select which GPIOs to add to the IRQ domain.
Instead it just adds all GPIOs which is not always desired. For example
there might be GPIOs that for some reason cannot generated normal
interrupts at all.

To support this we add a flag irq_need_valid_mask to struct gpio_chip. When
this flag is set the core allocates irq_valid_mask that holds one bit for
each GPIO the chip has. By default all bits are set but drivers can
manipulate this using set_bit() and clear_bit() accordingly.

Then when gpiochip_irqchip_add() is called, this mask is checked and all
GPIOs with bit is set are added to the IRQ domain created for the GPIO
chip.

Suggested-by: Linus Walleij <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Mika Westerberg 2016-09-20 15:15:21 +03:00 • committed by Linus Walleij
commit 79b804cb6a
3 changed files with 75 additions and 3 deletions
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6
Documentation/gpio/driver.txt
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@ -262,6 +262,12 @@ symbol:
to the container using container_of().
(See Documentation/driver-model/design-patterns.txt)
If there is a need to exclude certain GPIOs from the IRQ domain, one can
set .irq_need_valid_mask of the gpiochip before gpiochip_add_data() is
called. This allocates .irq_valid_mask with as many bits set as there are
GPIOs in the chip. Drivers can exclude GPIOs by clearing bits from this
mask. The mask must be filled in before gpiochip_irqchip_add() is called.
* gpiochip_set_chained_irqchip(): sets up a chained irq handler for a
gpio_chip from a parent IRQ and passes the struct gpio_chip* as handler
data. (Notice handler data, since the irqchip data is likely used by the