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gpio: Drop the parent_irq from gpio_irq_chip 

We already have an array named "parents" so instead
of letting one point to the other, simply allocate a
dynamic array to hold the parents, just one if desired
and drop the number of members in gpio_irq_chip by
1. Rename gpiochip to gc in the process.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2019-06-14 10:12:26 +02:00
parent 9a82ee69ee
commit 4892d3a6a0
2 changed files with 19 additions and 18 deletions
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30
drivers/gpio/gpiolib.c
View File

@ -1644,39 +1644,47 @@ EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid);
/**
* gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip
* @gpiochip: the gpiochip to set the irqchip chain to
* @gc: the gpiochip to set the irqchip chain to
* @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. If the interrupt is nested rather than
* cascaded, pass NULL in this handler argument
*/
static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gc,
unsigned int parent_irq,
irq_flow_handler_t parent_handler)
{
if (!gpiochip->irq.domain) {
chip_err(gpiochip, "called %s before setting up irqchip\n",
struct gpio_irq_chip *girq = &gc->irq;
struct device *dev = &gc->gpiodev->dev;
if (!girq->domain) {
chip_err(gc, "called %s before setting up irqchip\n",
__func__);
return;
}
if (parent_handler) {
if (gpiochip->can_sleep) {
chip_err(gpiochip,
if (gc->can_sleep) {
chip_err(gc,
"you cannot have chained interrupts on a chip that may sleep\n");
return;
}
girq->parents = devm_kcalloc(dev, 1,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents) {
chip_err(gc, "out of memory allocating parent IRQ\n");
return;
}
girq->parents[0] = parent_irq;
girq->num_parents = 1;
/*
* The parent irqchip is already using the chip_data for this
* irqchip, so our callbacks simply use the handler_data.
*/
irq_set_chained_handler_and_data(parent_irq, parent_handler,
gpiochip);
gpiochip->irq.parent_irq = parent_irq;
gpiochip->irq.parents = &gpiochip->irq.parent_irq;
gpiochip->irq.num_parents = 1;
gc);
}
}

7
include/linux/gpio/driver.h
View File

@ -102,13 +102,6 @@ struct gpio_irq_chip {
*/
unsigned int num_parents;
/**
* @parent_irq:
*
* For use by gpiochip_set_cascaded_irqchip()
*/
unsigned int parent_irq;
/**
* @parents:
*