Patch "gpio: ixp4xx: Make irqchip immutable" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    gpio: ixp4xx: Make irqchip immutable

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     gpio-ixp4xx-make-irqchip-immutable.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f9317d5b6cafbe51db6c781647f15326fa17f2fa
Author: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date:   Sun Sep 11 21:07:51 2022 +0200

    gpio: ixp4xx: Make irqchip immutable
    
    [ Upstream commit 94e9bc73d85aa6ecfe249e985ff57abe0ab35f34 ]
    
    This turns the IXP4xx GPIO irqchip into an immutable
    irqchip, a bit different from the standard template due
    to being hierarchical.
    
    Tested on the IXP4xx which uses drivers/ata/pata_ixp4xx_cf.c
    for a rootfs on compact flash with IRQs from this GPIO
    block to the CF ATA controller.
    
    Cc: Marc Zyngier <maz@xxxxxxxxxx>
    Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
    Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
    Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpio/gpio-ixp4xx.c b/drivers/gpio/gpio-ixp4xx.c
index b3b050604e0b..6bd047e2ca46 100644
--- a/drivers/gpio/gpio-ixp4xx.c
+++ b/drivers/gpio/gpio-ixp4xx.c
@@ -67,6 +67,14 @@ static void ixp4xx_gpio_irq_ack(struct irq_data *d)
 	__raw_writel(BIT(d->hwirq), g->base + IXP4XX_REG_GPIS);
 }
 
+static void ixp4xx_gpio_mask_irq(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	irq_chip_mask_parent(d);
+	gpiochip_disable_irq(gc, d->hwirq);
+}
+
 static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -76,6 +84,7 @@ static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
 	if (!(g->irq_edge & BIT(d->hwirq)))
 		ixp4xx_gpio_irq_ack(d);
 
+	gpiochip_enable_irq(gc, d->hwirq);
 	irq_chip_unmask_parent(d);
 }
 
@@ -153,12 +162,14 @@ static int ixp4xx_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
 }
 
-static struct irq_chip ixp4xx_gpio_irqchip = {
+static const struct irq_chip ixp4xx_gpio_irqchip = {
 	.name = "IXP4GPIO",
 	.irq_ack = ixp4xx_gpio_irq_ack,
-	.irq_mask = irq_chip_mask_parent,
+	.irq_mask = ixp4xx_gpio_mask_irq,
 	.irq_unmask = ixp4xx_gpio_irq_unmask,
 	.irq_set_type = ixp4xx_gpio_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int ixp4xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
@@ -282,7 +293,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
 	g->gc.owner = THIS_MODULE;
 
 	girq = &g->gc.irq;
-	girq->chip = &ixp4xx_gpio_irqchip;
+	gpio_irq_chip_set_chip(girq, &ixp4xx_gpio_irqchip);
 	girq->fwnode = g->fwnode;
 	girq->parent_domain = parent;
 	girq->child_to_parent_hwirq = ixp4xx_gpio_child_to_parent_hwirq;