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authorRussell King <rmk+kernel@armlinux.org.uk>2016-09-02 14:05:56 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-03-24 16:05:00 +0300
commit0e3cb6ee386f384a9131f0c7db52a0a961d2ded9 (patch)
tree9175981374fba497661844a7c83d543fc91f4358 /drivers/gpio/gpio-reg.c
parent380639c7cc786ec663e43eb3896ccf9172a46900 (diff)
downloadlinux-0e3cb6ee386f384a9131f0c7db52a0a961d2ded9.tar.xz
gpio: gpio-reg: add irq mapping for gpio-reg users
Add support for mapping gpio-reg gpios to interrupts. This may be a non-linear mapping - some gpios in the register may not even have corresponding interrupts associated with them, so we need to pass an array. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-reg.c')
-rw-r--r--drivers/gpio/gpio-reg.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-reg.c b/drivers/gpio/gpio-reg.c
index 209f73695a47..e85903eddc68 100644
--- a/drivers/gpio/gpio-reg.c
+++ b/drivers/gpio/gpio-reg.c
@@ -19,6 +19,8 @@ struct gpio_reg {
u32 direction;
u32 out;
void __iomem *reg;
+ struct irq_domain *irqdomain;
+ const int *irqs;
};
#define to_gpio_reg(x) container_of(x, struct gpio_reg, gc)
@@ -96,6 +98,17 @@ static void gpio_reg_set_multiple(struct gpio_chip *gc, unsigned long *mask,
spin_unlock_irqrestore(&r->lock, flags);
}
+static int gpio_reg_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+ int irq = r->irqs[offset];
+
+ if (irq >= 0 && r->irqdomain)
+ irq = irq_find_mapping(r->irqdomain, irq);
+
+ return irq;
+}
+
/**
* gpio_reg_init - add a fixed in/out register as gpio
* @dev: optional struct device associated with this register
@@ -104,7 +117,12 @@ static void gpio_reg_set_multiple(struct gpio_chip *gc, unsigned long *mask,
* @label: GPIO chip label
* @direction: bitmask of fixed direction, one per GPIO signal, 1 = in
* @def_out: initial GPIO output value
- * @names: array of %num strings describing each GPIO signal
+ * @names: array of %num strings describing each GPIO signal or %NULL
+ * @irqdom: irq domain or %NULL
+ * @irqs: array of %num ints describing the interrupt mapping for each
+ * GPIO signal, or %NULL. If @irqdom is %NULL, then this
+ * describes the Linux interrupt number, otherwise it describes
+ * the hardware interrupt number in the specified irq domain.
*
* Add a single-register GPIO device containing up to 32 GPIO signals,
* where each GPIO has a fixed input or output configuration. Only
@@ -114,7 +132,7 @@ static void gpio_reg_set_multiple(struct gpio_chip *gc, unsigned long *mask,
*/
struct gpio_chip *gpio_reg_init(struct device *dev, void __iomem *reg,
int base, int num, const char *label, u32 direction, u32 def_out,
- const char *const *names)
+ const char *const *names, struct irq_domain *irqdom, const int *irqs)
{
struct gpio_reg *r;
int ret;
@@ -136,12 +154,15 @@ struct gpio_chip *gpio_reg_init(struct device *dev, void __iomem *reg,
r->gc.set = gpio_reg_set;
r->gc.get = gpio_reg_get;
r->gc.set_multiple = gpio_reg_set_multiple;
+ if (irqs)
+ r->gc.to_irq = gpio_reg_to_irq;
r->gc.base = base;
r->gc.ngpio = num;
r->gc.names = names;
r->direction = direction;
r->out = def_out;
r->reg = reg;
+ r->irqs = irqs;
if (dev)
ret = devm_gpiochip_add_data(dev, &r->gc, r);