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>

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 676efcc..3ae8066 100644 (file)
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -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,