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pinctrl: st: add irq_request/release_resources callbacks 

When using GPIO as IRQ source, the GPIO must be configured
in INPUT. Callbacks dedicated for this was missing in
pinctrl-st driver.

This fix the following kernel error when trying to lock a gpio
as IRQ:

[    7.521095] gpio gpiochip7: (PIO11): gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
[    7.526018] gpio gpiochip7: (PIO11): unable to lock HW IRQ 6 for IRQ
[    7.529405] genirq: Failed to request resources for 0-0053 (irq 81) on irqchip GPIO

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Patrice Chotard 2017-03-16 18:26:02 +01:00 committed by Linus Walleij
parent a6566710ad
commit e855fa9a65
1 changed files with 24 additions and 6 deletions
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30
drivers/pinctrl/pinctrl-st.c
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@ -1285,6 +1285,22 @@ static void st_gpio_irq_unmask(struct irq_data *d)
writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
}
static int st_gpio_irq_request_resources(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
st_gpio_direction_input(gc, d->hwirq);
return gpiochip_lock_as_irq(gc, d->hwirq);
}
static void st_gpio_irq_release_resources(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
gpiochip_unlock_as_irq(gc, d->hwirq);
}
static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@ -1438,12 +1454,14 @@ static struct gpio_chip st_gpio_template = {
};
static struct irq_chip st_gpio_irqchip = {
.name = "GPIO",
.irq_disable = st_gpio_irq_mask,
.irq_mask = st_gpio_irq_mask,
.irq_unmask = st_gpio_irq_unmask,
.irq_set_type = st_gpio_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
.name = "GPIO",
.irq_request_resources = st_gpio_irq_request_resources,
.irq_release_resources = st_gpio_irq_release_resources,
.irq_disable = st_gpio_irq_mask,
.irq_mask = st_gpio_irq_mask,
.irq_unmask = st_gpio_irq_unmask,
.irq_set_type = st_gpio_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static int st_gpiolib_register_bank(struct st_pinctrl *info,