• Mika Westerberg's avatar
    gpiolib: Make it possible to exclude GPIOs from IRQ domain · 79b804cb
    Mika Westerberg authored
    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's avatarLinus Walleij <linus.walleij@linaro.org>
    Signed-off-by: Mika Westerberg's avatarMika Westerberg <mika.westerberg@linux.intel.com>
    Signed-off-by: Linus Walleij's avatarLinus Walleij <linus.walleij@linaro.org>
    79b804cb
driver.txt 17.3 KB