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gpio/omap: don't create an IRQ mapping for every GPIO on DT

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When a GPIO is defined as an interrupt line using Device
Tree, a call to irq_create_of_mapping() is made that calls
irq_create_mapping(). So, is not necessary to do the mapping
for all OMAP GPIO lines and explicitly call irq_create_mapping()
on the driver probe() when booting with Device Tree.

Add a custom IRQ domain .map function handler that will be
called by irq_create_mapping() to map the GPIO lines used as IRQ.
This also allows to execute needed setup code such as configuring
a GPIO as input and enabling the GPIO bank.

Changes since v3:
  - Use bank->chip.of_node instead of_have_populated_dt() to check
    DT or legacy boot as suggested by Jean-Christophe PLAGNIOL-VILLARD

Changes since v2:
  - Unconditionally do the IRQ setup in the .map() function and
    only call irq_create_mapping() in the gpio chip init to avoid
    code duplication as suggested by Grant Likely.

Changes since v1:
  - Split the addition of the .map function handler and the
    automatic gpio request in two different patches.
  - Add GPIO IRQ setup logic to the irq domain mapping function.
  - Only call irq_create_mapping for every GPIO on legacy boot.
  - Only setup a GPIO IRQ on the .map function for DeviceTree boot.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Enric Balletbo i Serra <eballetbo@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2013-06-28 17:27:02 +02:00 committed by Linus Walleij
parent ad81f0545e
commit 0e970cec05
1 changed files with 40 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/gpio/gpio-omap.c
View File

@ -1068,24 +1068,50 @@ static void omap_gpio_chip_init(struct gpio_bank *bank)
gpiochip_add(&bank->chip);
for (j = 0; j < bank->width; j++) {
int irq = irq_create_mapping(bank->domain, j);
irq_set_lockdep_class(irq, &gpio_lock_class);
irq_set_chip_data(irq, bank);
if (bank->is_mpuio) {
omap_mpuio_alloc_gc(bank, irq, bank->width);
} else {
irq_set_chip_and_handler(irq, &gpio_irq_chip,
handle_simple_irq);
set_irq_flags(irq, IRQF_VALID);
}
}
/*
* REVISIT these explicit calls to irq_create_mapping()
* to do the GPIO to IRQ domain mapping for each GPIO in
* the bank can be removed once all OMAP platforms have
* been migrated to Device Tree boot only.
* Since in DT boot irq_create_mapping() is called from
* irq_create_of_mapping() only for the GPIO lines that
* are used as interrupts.
*/
if (!bank->chip.of_node)
for (j = 0; j < bank->width; j++)
irq_create_mapping(bank->domain, j);
irq_set_chained_handler(bank->irq, gpio_irq_handler);
irq_set_handler_data(bank->irq, bank);
}
static const struct of_device_id omap_gpio_match[];
static int omap_gpio_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hwirq)
{
struct gpio_bank *bank = d->host_data;
if (!bank)
return -EINVAL;
irq_set_lockdep_class(virq, &gpio_lock_class);
irq_set_chip_data(virq, bank);
if (bank->is_mpuio) {
omap_mpuio_alloc_gc(bank, virq, bank->width);
} else {
irq_set_chip_and_handler(virq, &gpio_irq_chip,
handle_simple_irq);
set_irq_flags(virq, IRQF_VALID);
}
return 0;
}
static struct irq_domain_ops omap_gpio_irq_ops = {
.xlate = irq_domain_xlate_onetwocell,
.map = omap_gpio_irq_map,
};
static int omap_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -1151,10 +1177,10 @@ static int omap_gpio_probe(struct platform_device *pdev)
}
bank->domain = irq_domain_add_legacy(node, bank->width, irq_base,
0, &irq_domain_simple_ops, NULL);
0, &omap_gpio_irq_ops, bank);
#else
bank->domain = irq_domain_add_linear(node, bank->width,
&irq_domain_simple_ops, NULL);
&omap_gpio_irq_ops, bank);
#endif
if (!bank->domain) {
dev_err(dev, "Couldn't register an IRQ domain\n");