pinctrl: samsung: add irq_set_affinity() for non wake up external gpio interrupt

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>
Tested-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20231126094618.2545116-1-youngmin.nam@samsung.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index 6b58ec84e34b1c14cc9957da1af208d099e40558..5d7b788282e94fd10f5f2cb65b5d72145591173e 100644 (file)
--- 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,
        },