linux-kernel - [PATCH RFC 8/9] gpio: timberdale: Make irq

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Message-Id: <20250509-gpio-v1-8-639377c98288@nxp.com>
Date: Fri, 09 May 2025 12:45:39 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Ray Jui <rjui@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Scott Branden <sbranden@...adcom.com>, Vladimir Zapolskiy <vz@...ia.com>, 
 Keerthy <j-keerthy@...com>, Robert Jarzmik <robert.jarzmik@...e.fr>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, Peng Fan <peng.fan@....com>
Subject: [PATCH RFC 8/9] gpio: timberdale: Make irq_chip immutable

From: Peng Fan <peng.fan@....com>

Kernel warns about mutable irq_chips:
"not an immutable chip, please consider fixing!"

Constify timbgpio_irqchip, flag the irq_chip as IRQCHIP_IMMUTABLE,
add the new helper functions, and call the appropriate gpiolib functions.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/gpio/gpio-timberdale.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-timberdale.c b/drivers/gpio/gpio-timberdale.c
index fad979797486534d3cc6a1437fdca765baeb7b47..cb303a26f4d3cd77368b5bdac42aa42821b39345 100644
--- a/drivers/gpio/gpio-timberdale.c
+++ b/drivers/gpio/gpio-timberdale.c
@@ -103,20 +103,26 @@ static void timbgpio_irq_disable(struct irq_data *d)
 {
 	struct timbgpio *tgpio = irq_data_get_irq_chip_data(d);
 	int offset = d->irq - tgpio->irq_base;
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	unsigned long flags;
 
 	spin_lock_irqsave(&tgpio->lock, flags);
 	tgpio->last_ier &= ~(1UL << offset);
 	iowrite32(tgpio->last_ier, tgpio->membase + TGPIO_IER);
 	spin_unlock_irqrestore(&tgpio->lock, flags);
+
+	gpiochip_disable_irq(&tgpio->gpio, hwirq);
 }
 
 static void timbgpio_irq_enable(struct irq_data *d)
 {
 	struct timbgpio *tgpio = irq_data_get_irq_chip_data(d);
 	int offset = d->irq - tgpio->irq_base;
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	unsigned long flags;
 
+	gpiochip_enable_irq(&tgpio->gpio, hwirq);
+
 	spin_lock_irqsave(&tgpio->lock, flags);
 	tgpio->last_ier |= 1UL << offset;
 	iowrite32(tgpio->last_ier, tgpio->membase + TGPIO_IER);
@@ -205,11 +211,13 @@ static void timbgpio_irq(struct irq_desc *desc)
 	iowrite32(tgpio->last_ier, tgpio->membase + TGPIO_IER);
 }
 
-static struct irq_chip timbgpio_irqchip = {
+static const struct irq_chip timbgpio_irqchip = {
 	.name		= "GPIO",
 	.irq_enable	= timbgpio_irq_enable,
 	.irq_disable	= timbgpio_irq_disable,
 	.irq_set_type	= timbgpio_irq_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int timbgpio_probe(struct platform_device *pdev)

-- 
2.37.1