[PATCH v3 04/10] gpio: tegra186: Make the irqchip immutable

Marc Zyngier
2022-04-19T14:19:36Z

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@nvidia.com>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Marc Zyngier <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 031fe105b58e..84c4f1e9fb0c 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;
--
2.34.1