ath79: backport gpio immutable irq_chip support

This patch converts the driver to immutable irq-chip, which can
silence some gpio warnings.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>

diff --git a/target/linux/ath79/patches-6.1/010-v6.4-gpio-ath79-Convert-to-immutable-irq_chip.patch b/target/linux/ath79/patches-6.1/010-v6.4-gpio-ath79-Convert-to-immutable-irq_chip.patch
new file mode 100644 (file)
index 0000000..942380f
--- /dev/null
+++ b/target/linux/ath79/patches-6.1/010-v6.4-gpio-ath79-Convert-to-immutable-irq_chip.patch
@@ -0,0 +1,60 @@
+From b11ce7e48121a02ceedec9f4dfcab4f2bee8f35f Mon Sep 17 00:00:00 2001
+From: Linus Walleij <linus.walleij@linaro.org>
+Date: Thu, 9 Mar 2023 08:45:54 +0100
+Subject: gpio: ath79: Convert to immutable irq_chip
+
+Convert the driver to immutable irq-chip with a bit of
+intuition.
+
+Cc: Marc Zyngier <maz@kernel.org>
+Acked-by: Marc Zyngier <maz@kernel.org>
+Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
+Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
+---
+ drivers/gpio/gpio-ath79.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+--- a/drivers/gpio/gpio-ath79.c
++++ b/drivers/gpio/gpio-ath79.c
+@@ -71,6 +71,7 @@ static void ath79_gpio_irq_unmask(struct
+       u32 mask = BIT(irqd_to_hwirq(data));
+       unsigned long flags;
+ 
++      gpiochip_enable_irq(&ctrl->gc, irqd_to_hwirq(data));
+       raw_spin_lock_irqsave(&ctrl->lock, flags);
+       ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, mask);
+       raw_spin_unlock_irqrestore(&ctrl->lock, flags);
+@@ -85,6 +86,7 @@ static void ath79_gpio_irq_mask(struct i
+       raw_spin_lock_irqsave(&ctrl->lock, flags);
+       ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, 0);
+       raw_spin_unlock_irqrestore(&ctrl->lock, flags);
++      gpiochip_disable_irq(&ctrl->gc, irqd_to_hwirq(data));
+ }
+ 
+ static void ath79_gpio_irq_enable(struct irq_data *data)
+@@ -169,13 +171,15 @@ static int ath79_gpio_irq_set_type(struc
+       return 0;
+ }
+ 
+-static struct irq_chip ath79_gpio_irqchip = {
++static const struct irq_chip ath79_gpio_irqchip = {
+       .name = "gpio-ath79",
+       .irq_enable = ath79_gpio_irq_enable,
+       .irq_disable = ath79_gpio_irq_disable,
+       .irq_mask = ath79_gpio_irq_mask,
+       .irq_unmask = ath79_gpio_irq_unmask,
+       .irq_set_type = ath79_gpio_irq_set_type,
++      .flags = IRQCHIP_IMMUTABLE,
++      GPIOCHIP_IRQ_RESOURCE_HELPERS,
+ };
+ 
+ static void ath79_gpio_irq_handler(struct irq_desc *desc)
+@@ -274,7 +278,7 @@ static int ath79_gpio_probe(struct platf
+       /* Optional interrupt setup */
+       if (!np || of_property_read_bool(np, "interrupt-controller")) {
+               girq = &ctrl->gc.irq;
+-              girq->chip = &ath79_gpio_irqchip;
++              gpio_irq_chip_set_chip(girq, &ath79_gpio_irqchip);
+               girq->parent_handler = ath79_gpio_irq_handler;
+               girq->num_parents = 1;
+               girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),