linux-kernel - [PATCH V2] gpio: zynq: fix zynqmp_gpio not an immutable chip warning

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Message-ID: <1686249772-26231-1-git-send-email-manikanta.guntupalli@amd.com>
Date:   Fri, 9 Jun 2023 00:12:52 +0530
From:   Manikanta Guntupalli <manikanta.guntupalli@....com>
To:     <michal.simek@...inx.com>, <michal.simek@....com>, <git@....com>,
        <shubhrajyoti.datta@...inx.com>, <srinivas.neeli@...inx.com>,
        <linus.walleij@...aro.org>, <brgl@...ev.pl>,
        <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <srinivas.goud@....com>, <manion05gk@...il.com>,
        Manikanta Guntupalli <manikanta.guntupalli@....com>
Subject: [PATCH V2] 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@....com>
---
Changes for V2:
Add gpiochip_disable_irq() in the .irq_mask() callback
and gpiochip_enable_irq() in the .irq_unmask() callback
---
 drivers/gpio/gpio-zynq.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 06c6401f02b8..c334e46033ba 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/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,
-- 
2.25.1