linux-kernel - [irqchip: irq/irqchip-next] gpio: tegra186: Make the irqchip immutable

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Date:   Tue, 19 Apr 2022 14:29:03 -0000
From:   "irqchip-bot for Marc Zyngier" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Thierry Reding <treding@...dia.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] gpio: tegra186: Make the irqchip immutable

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     bba00555ede79ad8a743da908f708466f6bac0f8
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/bba00555ede79ad8a743da908f708466f6bac0f8
Author:        Marc Zyngier <maz@...nel.org>
AuthorDate:    Tue, 19 Apr 2022 15:18:40 +01:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Tue, 19 Apr 2022 15:22:26 +01:00

gpio: tegra186: Make the irqchip immutable

Prevent gpiolib from messing with the irqchip by advertising
the irq_chip structure as immutable, making it const, and adding
the various calls that gpiolib relies upon.

Acked-by: Thierry Reding <treding@...dia.com>
Reviewed-by: Bartosz Golaszewski <brgl@...ev.pl>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20220419141846.598305-5-maz@kernel.org
---
 drivers/gpio/gpio-tegra186.c | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 031fe10..84c4f1e 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -80,7 +80,6 @@ struct tegra_gpio_soc {
 
 struct tegra_gpio {
 	struct gpio_chip gpio;
-	struct irq_chip intc;
 	unsigned int num_irq;
 	unsigned int *irq;
 
@@ -372,6 +371,8 @@ static void tegra186_irq_mask(struct irq_data *data)
 	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
 	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
 	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
+
+	gpiochip_disable_irq(&gpio->gpio, data->hwirq);
 }
 
 static void tegra186_irq_unmask(struct irq_data *data)
@@ -385,6 +386,8 @@ static void tegra186_irq_unmask(struct irq_data *data)
 	if (WARN_ON(base == NULL))
 		return;
 
+	gpiochip_enable_irq(&gpio->gpio, data->hwirq);
+
 	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
 	value |= TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
 	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
@@ -456,6 +459,24 @@ static int tegra186_irq_set_wake(struct irq_data *data, unsigned int on)
 	return 0;
 }
 
+static void tegra186_irq_print_chip(struct irq_data *data, struct seq_file *p)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+
+	seq_printf(p, dev_name(gc->parent));
+}
+
+static const struct irq_chip tegra186_gpio_irq_chip = {
+	.irq_ack		= tegra186_irq_ack,
+	.irq_mask		= tegra186_irq_mask,
+	.irq_unmask		= tegra186_irq_unmask,
+	.irq_set_type		= tegra186_irq_set_type,
+	.irq_set_wake		= tegra186_irq_set_wake,
+	.irq_print_chip		= tegra186_irq_print_chip,
+	.flags			= IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static void tegra186_gpio_irq(struct irq_desc *desc)
 {
 	struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
@@ -760,15 +781,8 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 	gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
 #endif /* CONFIG_OF_GPIO */
 
-	gpio->intc.name = dev_name(&pdev->dev);
-	gpio->intc.irq_ack = tegra186_irq_ack;
-	gpio->intc.irq_mask = tegra186_irq_mask;
-	gpio->intc.irq_unmask = tegra186_irq_unmask;
-	gpio->intc.irq_set_type = tegra186_irq_set_type;
-	gpio->intc.irq_set_wake = tegra186_irq_set_wake;
-
 	irq = &gpio->gpio.irq;
-	irq->chip = &gpio->intc;
+	gpio_irq_chip_set_chip(irq, &tegra186_gpio_irq_chip);
 	irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
 	irq->child_to_parent_hwirq = tegra186_gpio_child_to_parent_hwirq;
 	irq->populate_parent_alloc_arg = tegra186_gpio_populate_parent_fwspec;