gpio: zynq: fix zynqmp_gpio not an immutable chip warning

Make the struct irq_chip const and flag it as IRQCHIP_IMMUTABLE,
call gpiochip_disable_irq() in the .irq_mask() callback and
gpiochip_enable_irq() in the .irq_unmask() callback to fix
"gpio gpiochip1: (zynqmp_gpio): not an immutable chip" warning.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-zynq.c

@@ -151,8 +151,8 @@ struct zynq_platform_data {
 	int bank_max[ZYNQMP_GPIO_MAX_BANK];
 };
 
-static struct irq_chip zynq_gpio_level_irqchip;
-static struct irq_chip zynq_gpio_edge_irqchip;
+static const struct irq_chip zynq_gpio_level_irqchip;
+static const struct irq_chip zynq_gpio_edge_irqchip;
 
 /**
  * zynq_gpio_is_zynq - test if HW is zynq or zynqmp
@@ -404,9 +404,12 @@ static int zynq_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
 static void zynq_gpio_irq_mask(struct irq_data *irq_data)
 {
 	unsigned int device_pin_num, bank_num, bank_pin_num;
+	const unsigned long offset = irqd_to_hwirq(irq_data);
+	struct gpio_chip *chip = irq_data_get_irq_chip_data(irq_data);
 	struct zynq_gpio *gpio =
 		gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
 
+	gpiochip_disable_irq(chip, offset);
 	device_pin_num = irq_data->hwirq;
 	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
 	writel_relaxed(BIT(bank_pin_num),
@@ -425,9 +428,12 @@ static void zynq_gpio_irq_mask(struct irq_data *irq_data)
 static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
 {
 	unsigned int device_pin_num, bank_num, bank_pin_num;
+	const unsigned long offset = irqd_to_hwirq(irq_data);
+	struct gpio_chip *chip = irq_data_get_irq_chip_data(irq_data);
 	struct zynq_gpio *gpio =
 		gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
 
+	gpiochip_enable_irq(chip, offset);
 	device_pin_num = irq_data->hwirq;
 	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
 	writel_relaxed(BIT(bank_pin_num),
@@ -590,7 +596,7 @@ static void zynq_gpio_irq_relres(struct irq_data *d)
 }
 
 /* irq chip descriptor */
-static struct irq_chip zynq_gpio_level_irqchip = {
+static const struct irq_chip zynq_gpio_level_irqchip = {
 	.name		= DRIVER_NAME,
 	.irq_enable	= zynq_gpio_irq_enable,
 	.irq_eoi	= zynq_gpio_irq_ack,
@@ -601,10 +607,11 @@ static struct irq_chip zynq_gpio_level_irqchip = {
 	.irq_request_resources = zynq_gpio_irq_reqres,
 	.irq_release_resources = zynq_gpio_irq_relres,
 	.flags		= IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
-			  IRQCHIP_MASK_ON_SUSPEND,
+			  IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
-static struct irq_chip zynq_gpio_edge_irqchip = {
+static const struct irq_chip zynq_gpio_edge_irqchip = {
 	.name		= DRIVER_NAME,
 	.irq_enable	= zynq_gpio_irq_enable,
 	.irq_ack	= zynq_gpio_irq_ack,
@@ -614,7 +621,8 @@ static struct irq_chip zynq_gpio_edge_irqchip = {
 	.irq_set_wake	= zynq_gpio_set_wake,
 	.irq_request_resources = zynq_gpio_irq_reqres,
 	.irq_release_resources = zynq_gpio_irq_relres,
-	.flags		= IRQCHIP_MASK_ON_SUSPEND,
+	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,
@@ -962,7 +970,7 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 
 	/* Set up the GPIO irqchip */
 	girq = &chip->irq;
-	girq->chip = &zynq_gpio_edge_irqchip;
+	gpio_irq_chip_set_chip(girq, &zynq_gpio_edge_irqchip);
 	girq->parent_handler = zynq_gpio_irqhandler;
 	girq->num_parents = 1;
 	girq->parents = devm_kcalloc(&pdev->dev, 1,