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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-05-14 23:14:24 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2012-05-20 17:27:07 +0200
commitcd99758ba3bde64347a8ece381cbae2fb5c745b2 (patch)
treece74c5150978f1cd29861e33e8847bc5dd667ed7 /drivers/gpio
parent4492c4c3ff7bbb5fd400f021532643a3493f0723 (diff)
mfd: Convert wm831x to irq_domain
The modern idiom is to use irq_domain to allocate interrupts. This is useful partly to allow further infrastructure to be based on the domains and partly because it makes it much easier to allocate virtual interrupts to devices as we don't need to allocate a contiguous range of interrupt numbers. Convert the wm831x driver over to this infrastructure, using a legacy IRQ mapping if an irq_base is specified in platform data and otherwise using a linear mapping, always registering the interrupts even if they won't ever be used. Only boards which need to use the GPIOs as interrupts should need to use an irq_base. This means that we can't use the MFD irq_base management since the unless we're using an explicit irq_base from platform data we can't rely on a linear mapping of interrupts. Instead we need to map things via the irq_domain - provide a conveniencem function wm831x_irq() to save a small amount of typing when doing so. Looking at this I couldn't clearly see anything the MFD core could do to make this nicer. Since we're not supporting device tree yet there's no meaningful advantage if we don't do this conversion in one, the fact that the interrupt resources are used for repeated IP blocks makes accessor functions for the irq_domain more trouble to do than they're worth. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-wm831x.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-wm831x.c b/drivers/gpio/gpio-wm831x.c
index deb949e75ec..e56a2165641 100644
--- a/drivers/gpio/gpio-wm831x.c
+++ b/drivers/gpio/gpio-wm831x.c
@@ -102,10 +102,8 @@ static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
struct wm831x *wm831x = wm831x_gpio->wm831x;
- if (!wm831x->irq_base)
- return -EINVAL;
-
- return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
+ return irq_create_mapping(wm831x->irq_domain,
+ WM831X_IRQ_GPIO_1 + offset);
}
static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,