[PATCH 1/1] pinctrl: st: add irq_request_resources callback

From: patrice.chotard
Date: Mon Feb 27 2017 - 09:45:37 EST


From: Patrice Chotard <patrice.chotard@xxxxxx>

When using GPIO as IRQ source, the GPIO must be configured
in INPUT. The callback 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@xxxxxx>
---
drivers/pinctrl/pinctrl-st.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 676efcc..84c2af8 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1285,6 +1285,14 @@ 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);
+ int pin = d->hwirq;
+
+ return st_gpio_direction_input(gc, pin);
+}
+
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 +1446,13 @@ static void st_gpio_irqmux_handler(struct irq_desc *desc)
};

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_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,
--
1.9.1