gpiolib: add irq_not_threaded flag to gpio_chip

Some GPIO chips (e.g. the DLN2 USB adapter) have blocking get/set
operation but do not need a threaded irq handler.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4acf8b2..6fdae78 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -437,7 +437,7 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
        irq_set_lockdep_class(irq, &gpiochip_irq_lock_class);
        irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
        /* Chips that can sleep need nested thread handlers */
-       if (chip->can_sleep)
+       if (chip->can_sleep && !chip->irq_not_threaded)
                irq_set_nested_thread(irq, 1);
 #ifdef CONFIG_ARM
        set_irq_flags(irq, IRQF_VALID);

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 560bf7f..719fab2 100644 (file)
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -56,6 +56,8 @@ struct seq_file;
  *     as the chip access may sleep when e.g. reading out the IRQ status
  *     registers.
  * @exported: flags if the gpiochip is exported for use from sysfs. Private.
+ * @irq_not_threaded: flag must be set if @can_sleep is set but the
+ *     IRQs don't need to be threaded
  *
  * A gpio_chip can help platforms abstract various sources of GPIOs so
  * they can all be accessed through a common programing interface.
@@ -101,6 +103,7 @@ struct gpio_chip {
        struct gpio_desc        *desc;
        const char              *const *names;
        bool                    can_sleep;
+       bool                    irq_not_threaded;
        bool                    exported;
 
 #ifdef CONFIG_GPIOLIB_IRQCHIP