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

irqchip-bot for Marc Zyngier
2022-04-19T14:29:35Z

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@kernel.org>
AuthorDate: Tue, 19 Apr 2022 15:18:39 +01:00
Committer: Marc Zyngier <maz@kernel.org>
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@gmail.com>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220419141846.598305-4-maz@kernel.org
---
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);