gpio: max77620: Use helper variable and clarify

Most other drivers fill out the gpio_irq_chip using a
struct gpio_irq_chip *girq helper variable for ease of
reading.

We also make a habit of explicitly assigning NULL and
zero to the parent IRQs when using ordinary IRQ handlers
in the driver, mostly for code readability and
maintenance.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Cc: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200716092835.69176-1-linus.walleij@linaro.org

diff --git a/drivers/gpio/gpio-max77620.c b/drivers/gpio/gpio-max77620.c
index e090979..7c0a9ef 100644 (file)
--- a/drivers/gpio/gpio-max77620.c
+++ b/drivers/gpio/gpio-max77620.c
@@ -288,6 +288,7 @@ static int max77620_gpio_probe(struct platform_device *pdev)
 {
        struct max77620_chip *chip =  dev_get_drvdata(pdev->dev.parent);
        struct max77620_gpio *mgpio;
+       struct gpio_irq_chip *girq;
        unsigned int gpio_irq;
        int ret;
 
@@ -316,11 +317,16 @@ static int max77620_gpio_probe(struct platform_device *pdev)
        mgpio->gpio_chip.can_sleep = 1;
        mgpio->gpio_chip.base = -1;
 
-       mgpio->gpio_chip.irq.chip = &max77620_gpio_irqchip;
-       mgpio->gpio_chip.irq.default_type = IRQ_TYPE_NONE;
-       mgpio->gpio_chip.irq.handler = handle_edge_irq;
-       mgpio->gpio_chip.irq.init_hw = max77620_gpio_irq_init_hw,
-       mgpio->gpio_chip.irq.threaded = true;
+       girq = &mgpio->gpio_chip.irq;
+       girq->chip = &max77620_gpio_irqchip;
+       /* This will let us handle the parent IRQ in the driver */
+       girq->parent_handler = NULL;
+       girq->num_parents = 0;
+       girq->parents = NULL;
+       girq->default_type = IRQ_TYPE_NONE;
+       girq->handler = handle_edge_irq;
+       girq->init_hw = max77620_gpio_irq_init_hw,
+       girq->threaded = true;
 
        platform_set_drvdata(pdev, mgpio);