[irqchip: irq/irqchip-next] gpio: Add helpers to ease the transition towards immutable irq_chip

[irqchip-bot for Marc Zyngier]

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

Commit-ID:     36b78aae4bfee749bbde73be570796bfd0f56bec
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/36b78aae4bfee749bbde73be570796bfd0f56bec
Author:        Marc Zyngier <maz@xxxxxxxxxx>
AuthorDate:    Tue, 19 Apr 2022 15:18:39 +01:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Tue, 19 Apr 2022 15:22:25 +01:00

gpio: Add helpers to ease the transition towards immutable irq_chip

Add a couple of new helpers to make it slightly simpler to convert
drivers to immutable irq_chip structures:

- GPIOCHIP_IRQ_RESOURCE_HELPERS populates the irq_chip structure
  with the resource management callbacks

- gpio_irq_chip_set_chip() populates the gpio_irq_chip.chip
  structure, avoiding the proliferation of ugly casts

Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <brgl@xxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220419141846.598305-4-maz@xxxxxxxxxx
---
 include/linux/gpio/driver.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 066bcfd..8329900 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -583,6 +583,18 @@ void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
 int gpiochip_irq_reqres(struct irq_data *data);
 void gpiochip_irq_relres(struct irq_data *data);
 
+/* Paste this in your irq_chip structure  */
+#define	GPIOCHIP_IRQ_RESOURCE_HELPERS					\
+		.irq_request_resources  = gpiochip_irq_reqres,		\
+		.irq_release_resources  = gpiochip_irq_relres
+
+static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
+					  const struct irq_chip *chip)
+{
+	/* Yes, dropping const is ugly, but it isn't like we have a choice */
+	girq->chip = (struct irq_chip *)chip;
+}
+
 /* Line status inquiry for drivers */
 bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
 bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);