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gpio: Add GPIOLIB_IRQCHIP cleanup to TODO 

We now have two APIs for registering GPIOLIB_IRQCHIP, this is not
working and creating confusion. Add a TODO item to fix it up.

Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
alistair/sunxi64-5.4-dsi
Linus Walleij 2019-06-14 09:34:11 +02:00
parent 42d9fc7176
commit 9a82ee69ee
1 changed files with 40 additions and 0 deletions
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40
drivers/gpio/TODO
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@ -90,6 +90,46 @@ GPIOLIB irqchip
The GPIOLIB irqchip is a helper irqchip for "simple cases" that should
try to cover any generic kind of irqchip cascaded from a GPIO.
- Convert all the GPIOLIB_IRQCHIP users to pass an irqchip template,
parent and flags before calling [devm_]gpiochip_add[_data]().
Currently we set up the irqchip after setting up the gpiochip
using gpiochip_irqchip_add() and gpiochip_set_[chained|nested]_irqchip().
This is too complex, so convert all users over to just set up
the irqchip before registering the gpio_chip, typical example:
/* Typical state container with dynamic irqchip */
struct my_gpio {
struct gpio_chip gc;
struct irq_chip irq;
};
int irq; /* from platform etc */
struct my_gpio *g;
struct gpio_irq_chip *girq
/* Set up the irqchip dynamically */
g->irq.name = "my_gpio_irq";
g->irq.irq_ack = my_gpio_ack_irq;
g->irq.irq_mask = my_gpio_mask_irq;
g->irq.irq_unmask = my_gpio_unmask_irq;
g->irq.irq_set_type = my_gpio_set_irq_type;
/* Get a pointer to the gpio_irq_chip */
girq = &g->gc.irq;
girq->chip = &g->irq;
girq->parent_handler = ftgpio_gpio_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_bad_irq;
girq->parents[0] = irq;
When this is done, we will delete the old APIs for instatiating
GPIOLIB_IRQCHIP and simplify the code.
- Look over and identify any remaining easily converted drivers and
dry-code conversions to gpiolib irqchip for maintainers to test