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Merge branch irq/gpio-immutable into irq/irqchip-next

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* irq/gpio-immutable:
  : .
  : First try at preventing the GPIO subsystem from abusing irq_chip
  : data structures. The general idea is to have an irq_chip flag
  : to tell the GPIO subsystem that these structures are immutable,
  : and to convert drivers one by one.
  : .
  Documentation: Update the recommended pattern for GPIO irqchips
  gpio: Update TODO to mention immutable irq_chip structures
  pinctrl: amd: Make the irqchip immutable
  pinctrl: msmgpio: Make the irqchip immutable
  pinctrl: apple-gpio: Make the irqchip immutable
  gpio: pl061: Make the irqchip immutable
  gpio: tegra186: Make the irqchip immutable
  gpio: Add helpers to ease the transition towards immutable irq_chip
  gpio: Expose the gpiochip_irq_re[ql]res helpers
  gpio: Don't fiddle with irqchips marked as immutable

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-04-19 15:23:14 +01:00
commit 4bde53ab33
11 changed files with 293 additions and 90 deletions
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16
include/linux/gpio/driver.h
View file

@ -588,6 +588,22 @@ void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
/* irq_data versions of the above */
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);

2
include/linux/irq.h
View file

@ -569,6 +569,7 @@ struct irq_chip {
* IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs
* in the suspend path if they are in disabled state
* IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup
* IRQCHIP_IMMUTABLE: Don't ever change anything in this chip
*/
enum {
IRQCHIP_SET_TYPE_MASKED = (1 << 0),
@ -582,6 +583,7 @@ enum {
IRQCHIP_SUPPORTS_NMI = (1 << 8),
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9),
IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10),
IRQCHIP_IMMUTABLE = (1 << 11),
};
#include <linux/irqdesc.h>