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gpio: dwapb: Add wakeup source support 

This patch supports irq_set_wake for dwapb gpio. It allows GPIOs
to be configured as wakeup sources and wake the system from suspend.

Signed-off-by: Hoan Tran <hotran@apm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Hoan Tran 2017-09-08 15:41:15 -07:00 committed by Linus Walleij
parent a621c99a96
commit 6437c7ba69
1 changed files with 22 additions and 1 deletions
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23
drivers/gpio/gpio-dwapb.c
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@ -77,6 +77,7 @@ struct dwapb_context {
u32 int_type;
u32 int_pol;
u32 int_deb;
u32 wake_en;
};
#endif
@ -295,6 +296,22 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
{
struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = igc->private;
struct dwapb_context *ctx = gpio->ports[0].ctx;
if (enable)
ctx->wake_en |= BIT(d->hwirq);
else
ctx->wake_en &= ~BIT(d->hwirq);
return 0;
}
#endif
static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
unsigned offset, unsigned debounce)
{
@ -385,6 +402,9 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
ct->chip.irq_disable = dwapb_irq_disable;
ct->chip.irq_request_resources = dwapb_irq_reqres;
ct->chip.irq_release_resources = dwapb_irq_relres;
#ifdef CONFIG_PM_SLEEP
ct->chip.irq_set_wake = dwapb_irq_set_wake;
#endif
ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI);
ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK);
ct->type = IRQ_TYPE_LEVEL_MASK;
@ -699,7 +719,8 @@ static int dwapb_gpio_suspend(struct device *dev)
ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
/* Mask out interrupts */
dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
dwapb_write(gpio, GPIO_INTMASK,
0xffffffff & ~ctx->wake_en);
}
}
spin_unlock_irqrestore(&gc->bgpio_lock, flags);