diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 9362b5b817af..6e00c82be142 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -385,13 +385,14 @@ static struct gpio_chip *find_chip_by_name(const char *name) */ /** - * gpiochip_add_chained_irqchip() - adds a chained irqchip to a gpiochip - * @gpiochip: the gpiochip to add the irqchip to - * @irqchip: the irqchip to add to the gpiochip + * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip + * @gpiochip: the gpiochip to set the irqchip chain to + * @irqchip: the irqchip to chain to the gpiochip * @parent_irq: the irq number corresponding to the parent IRQ for this * chained irqchip * @parent_handler: the parent interrupt handler for the accumulated IRQ - * coming out of the gpiochip + * coming out of the gpiochip. If the interrupt is nested rather than + * cascaded, pass NULL in this handler argument */ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, struct irq_chip *irqchip, @@ -400,23 +401,26 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, { unsigned int offset; - if (gpiochip->can_sleep) { - chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); - return; - } if (!gpiochip->irqdomain) { chip_err(gpiochip, "called %s before setting up irqchip\n", __func__); return; } - irq_set_chained_handler(parent_irq, parent_handler); - - /* - * The parent irqchip is already using the chip_data for this - * irqchip, so our callbacks simply use the handler_data. - */ - irq_set_handler_data(parent_irq, gpiochip); + if (parent_handler) { + if (gpiochip->can_sleep) { + chip_err(gpiochip, + "you cannot have chained interrupts on a " + "chip that may sleep\n"); + return; + } + irq_set_chained_handler(parent_irq, parent_handler); + /* + * The parent irqchip is already using the chip_data for this + * irqchip, so our callbacks simply use the handler_data. + */ + irq_set_handler_data(parent_irq, gpiochip); + } /* Set the parent IRQ for all affected IRQs */ for (offset = 0; offset < gpiochip->ngpio; offset++) |
