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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>
This commit is contained in:
Russell King 2016-09-02 12:05:56 +01:00 committed by Linus Walleij
parent 380639c7cc
commit 0e3cb6ee38
2 changed files with 25 additions and 3 deletions
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25
drivers/gpio/gpio-reg.c
View File

@ -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);

3
include/linux/gpio/gpio-reg.h
View File

@ -2,10 +2,11 @@
#define GPIO_REG_H
struct device;
struct irq_domain;
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);
int gpio_reg_resume(struct gpio_chip *gc);