linux-kernel - [PATCH] gpio: sprd: Make irq

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Date:   Fri, 16 Dec 2022 12:17:08 +0800
From:   Cixi Geng <cixi.geng@...ux.dev>
To:     linus.walleij@...aro.org, brgl@...ev.pl, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        gengcixi@...il.com
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpio: sprd: Make irq_chip immutable

From: Cixi Geng <cixi.geng1@...soc.com>

Kernel warns about mutable irq_chips:

    "not an immutable chip, please consider fixing!"

Make the struct irq_chip const, flag it as IRQCHIP_IMMUTABLE, add the
new helper functions, and call the appropriate gpiolib functions.

Signed-off-by: Cixi Geng <cixi.geng1@...soc.com>
---
 drivers/gpio/gpio-eic-sprd.c      |  4 ++--
 drivers/gpio/gpio-pmic-eic-sprd.c |  4 ++--
 drivers/gpio/gpio-sprd.c          | 11 +++++++++--
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-eic-sprd.c b/drivers/gpio/gpio-eic-sprd.c
index 8d722e026e9c..07b9099f2a6d 100644
--- a/drivers/gpio/gpio-eic-sprd.c
+++ b/drivers/gpio/gpio-eic-sprd.c
@@ -631,10 +631,10 @@ static int sprd_eic_probe(struct platform_device *pdev)
 	sprd_eic->intc.irq_mask = sprd_eic_irq_mask;
 	sprd_eic->intc.irq_unmask = sprd_eic_irq_unmask;
 	sprd_eic->intc.irq_set_type = sprd_eic_irq_set_type;
-	sprd_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE;
+	sprd_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE;
 
 	irq = &sprd_eic->chip.irq;
-	irq->chip = &sprd_eic->intc;
+	gpio_irq_chip_set_chip(irq, &sprd_eic->intc);
 	irq->handler = handle_bad_irq;
 	irq->default_type = IRQ_TYPE_NONE;
 	irq->parent_handler = sprd_eic_irq_handler;
diff --git a/drivers/gpio/gpio-pmic-eic-sprd.c b/drivers/gpio/gpio-pmic-eic-sprd.c
index e518490c4b68..d96604ea10e7 100644
--- a/drivers/gpio/gpio-pmic-eic-sprd.c
+++ b/drivers/gpio/gpio-pmic-eic-sprd.c
@@ -344,10 +344,10 @@ static int sprd_pmic_eic_probe(struct platform_device *pdev)
 	pmic_eic->intc.irq_set_type = sprd_pmic_eic_irq_set_type;
 	pmic_eic->intc.irq_bus_lock = sprd_pmic_eic_bus_lock;
 	pmic_eic->intc.irq_bus_sync_unlock = sprd_pmic_eic_bus_sync_unlock;
-	pmic_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE;
+	pmic_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE;
 
 	irq = &pmic_eic->chip.irq;
-	irq->chip = &pmic_eic->intc;
+	gpio_irq_chip_set_chip(irq, &pmic_eic->intc);
 	irq->threaded = true;
 
 	ret = devm_gpiochip_add_data(&pdev->dev, &pmic_eic->chip, pmic_eic);
diff --git a/drivers/gpio/gpio-sprd.c b/drivers/gpio/gpio-sprd.c
index 9bff63990eee..8398f9707ec0 100644
--- a/drivers/gpio/gpio-sprd.c
+++ b/drivers/gpio/gpio-sprd.c
@@ -64,6 +64,11 @@ static void sprd_gpio_update(struct gpio_chip *chip, unsigned int offset,
 
 	writel_relaxed(tmp, base + reg);
 	spin_unlock_irqrestore(&sprd_gpio->lock, flags);
+
+	if (reg == SPRD_GPIO_IE && val == 1)
+		gpiochip_enable_irq(chip, offset);
+	else if (reg == SPRD_GPIO_IE && val == 0)
+		gpiochip_disable_irq(chip, offset);
 }
 
 static int sprd_gpio_read(struct gpio_chip *chip, unsigned int offset, u16 reg)
@@ -205,13 +210,15 @@ static void sprd_gpio_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(ic, desc);
 }
 
-static struct irq_chip sprd_gpio_irqchip = {
+static const struct irq_chip sprd_gpio_irqchip = {
 	.name = "sprd-gpio",
 	.irq_ack = sprd_gpio_irq_ack,
 	.irq_mask = sprd_gpio_irq_mask,
 	.irq_unmask = sprd_gpio_irq_unmask,
 	.irq_set_type = sprd_gpio_irq_set_type,
 	.flags = IRQCHIP_SKIP_SET_WAKE,
+	.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int sprd_gpio_probe(struct platform_device *pdev)
@@ -245,7 +252,7 @@ static int sprd_gpio_probe(struct platform_device *pdev)
 	sprd_gpio->chip.direction_output = sprd_gpio_direction_output;
 
 	irq = &sprd_gpio->chip.irq;
-	irq->chip = &sprd_gpio_irqchip;
+	gpio_irq_chip_set_chip(irq, &sprd_gpio_irqchip);
 	irq->handler = handle_bad_irq;
 	irq->default_type = IRQ_TYPE_NONE;
 	irq->parent_handler = sprd_gpio_irq_handler;
-- 
2.34.1