[PATCH v2] pinctrl: samsung: add irq_set_affinity() for non wake up external gpio interrupt

Youngmin Nam
2023-11-26T09:24:23Z

To support affinity setting for non wake up external gpio interrupt,
add irq_set_affinity callback using irq number from pinctrl driver data.

Before this patch, changing the irq affinity of gpio interrupt is not possible:

# cat /proc/irq/418/smp_affinity
3ff
# echo 00f > /proc/irq/418/smp_affinity
# cat /proc/irq/418/smp_affinity
3ff
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 ...
418: 3631 0 0 0 ...

With this patch applied, it's possible to change irq affinity of gpio interrupt:

# cat /proc/irq/418/smp_affinity
3ff
# echo 00f > /proc/irq/418/smp_affinity
# cat /proc/irq/418/smp_affinity
00f
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 ...
418: 3893 201 181 188 ...

Signed-off-by: Youngmin Nam <youngmin.nam@samsung.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
---
drivers/pinctrl/samsung/pinctrl-exynos.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index 6b58ec84e34b..5d7b788282e9 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.c
@@ -147,6 +147,19 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
return 0;
}

+static int exynos_irq_set_affinity(struct irq_data *irqd,
+ const struct cpumask *dest, bool force)
+{
+ struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
+ struct samsung_pinctrl_drv_data *d = bank->drvdata;
+ struct irq_data *parent = irq_get_irq_data(d->irq);
+
+ if (parent)
+ return parent->chip->irq_set_affinity(parent, dest, force);
+
+ return -EINVAL;
+}
+
static int exynos_irq_request_resources(struct irq_data *irqd)
{
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
@@ -212,6 +225,7 @@ static const struct exynos_irq_chip exynos_gpio_irq_chip __initconst = {
.irq_mask = exynos_irq_mask,
.irq_ack = exynos_irq_ack,
.irq_set_type = exynos_irq_set_type,
+ .irq_set_affinity = exynos_irq_set_affinity,
.irq_request_resources = exynos_irq_request_resources,
.irq_release_resources = exynos_irq_release_resources,
},
--
2.39.2