+From 086480cc43b9d967647b237a84623b27b8850a64 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Wed, 3 Apr 2024 23:16:47 +0100
+Subject: [PATCH 4/5] pinctrl: rp1: Support interrupt CPU affinity
+
+See: https://github.com/raspberrypi/linux/issues/6077
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ drivers/pinctrl/pinctrl-rp1.c | 24 ++++++++++++++++++++++++
+ 1 file changed, 24 insertions(+)
+
+--- a/drivers/pinctrl/pinctrl-rp1.c
++++ b/drivers/pinctrl/pinctrl-rp1.c
+@@ -894,6 +894,29 @@ static void rp1_gpio_irq_ack(struct irq_
+ writel(RP1_GPIO_CTRL_IRQRESET, pin->gpio + RP1_SET_OFFSET + RP1_GPIO_CTRL);
+ }
+
++static int rp1_gpio_irq_set_affinity(struct irq_data *data, const struct cpumask *dest, bool force)
++{
++ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
++ struct rp1_pinctrl *pc = gpiochip_get_data(chip);
++ const struct rp1_iobank_desc *bank;
++ struct irq_data *parent_data = NULL;
++ int i;
++
++ for (i = 0; i < 3; i++) {
++ bank = &rp1_iobanks[i];
++ if (data->hwirq >= bank->min_gpio &&
++ data->hwirq < bank->min_gpio + bank->num_gpios) {
++ parent_data = irq_get_irq_data(pc->irq[i]);
++ break;
++ }
++ }
++
++ if (parent_data && parent_data->chip->irq_set_affinity)
++ return parent_data->chip->irq_set_affinity(parent_data, dest, force);
++
++ return -EINVAL;
++}
++
+ static struct irq_chip rp1_gpio_irq_chip = {
+ .name = MODULE_NAME,
+ .irq_enable = rp1_gpio_irq_enable,
+@@ -902,6 +925,7 @@ static struct irq_chip rp1_gpio_irq_chip
+ .irq_ack = rp1_gpio_irq_ack,
+ .irq_mask = rp1_gpio_irq_disable,
+ .irq_unmask = rp1_gpio_irq_enable,
++ .irq_set_affinity = rp1_gpio_irq_set_affinity,
+ .flags = IRQCHIP_IMMUTABLE,
+ };
+