gpio: regmap: Allow to allocate regmap-irq device

[ Upstream commit 553b75d4bfe9264f631d459fe9996744e0672b0e ]

GPIO controller often have support for IRQ: allow to easily allocate
both gpio-regmap and regmap-irq in one operation.

Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Mathieu Dubois-Briand <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>
Stable-dep-of: 2ba5772e530f ("gpio: idio-16: Define fixed direction of the GPIO lines")
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: mbriand

drivers/gpio/gpio-regmap.c

@@ -32,6 +32,11 @@ struct gpio_regmap {
 	unsigned int reg_dir_in_base;
 	unsigned int reg_dir_out_base;
 
+#ifdef CONFIG_REGMAP_IRQ
+	int regmap_irq_line;
+	struct regmap_irq_chip_data *irq_chip_data;
+#endif
+
 	int (*reg_mask_xlate)(struct gpio_regmap *gpio, unsigned int base,
 			      unsigned int offset, unsigned int *reg,
 			      unsigned int *mask);
@@ -215,6 +220,7 @@ EXPORT_SYMBOL_GPL(gpio_regmap_get_drvdata);
  */
 struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config)
 {
+	struct irq_domain *irq_domain;
 	struct gpio_regmap *gpio;
 	struct gpio_chip *chip;
 	int ret;
@@ -295,8 +301,22 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 	if (ret < 0)
 		goto err_free_gpio;
 
-	if (config->irq_domain) {
-		ret = gpiochip_irqchip_add_domain(chip, config->irq_domain);
+#ifdef CONFIG_REGMAP_IRQ
+	if (config->regmap_irq_chip) {
+		gpio->regmap_irq_line = config->regmap_irq_line;
+		ret = regmap_add_irq_chip_fwnode(dev_fwnode(config->parent), config->regmap,
+						 config->regmap_irq_line, config->regmap_irq_flags,
+						 0, config->regmap_irq_chip, &gpio->irq_chip_data);
+		if (ret)
+			goto err_free_gpio;
+
+		irq_domain = regmap_irq_get_domain(gpio->irq_chip_data);
+	} else
+#endif
+	irq_domain = config->irq_domain;
+
+	if (irq_domain) {
+		ret = gpiochip_irqchip_add_domain(chip, irq_domain);
 		if (ret)
 			goto err_remove_gpiochip;
 	}
@@ -317,6 +337,11 @@ EXPORT_SYMBOL_GPL(gpio_regmap_register);
  */
 void gpio_regmap_unregister(struct gpio_regmap *gpio)
 {
+#ifdef CONFIG_REGMAP_IRQ
+	if (gpio->irq_chip_data)
+		regmap_del_irq_chip(gpio->regmap_irq_line, gpio->irq_chip_data);
+#endif
+
 	gpiochip_remove(&gpio->gpio_chip);
 	kfree(gpio);
 }

include/linux/gpio/regmap.h

@@ -40,6 +40,11 @@ struct regmap;
  * @drvdata:		(Optional) Pointer to driver specific data which is
  *			not used by gpio-remap but is provided "as is" to the
  *			driver callback(s).
+ * @regmap_irq_chip:	(Optional) Pointer on an regmap_irq_chip structure. If
+ *			set, a regmap-irq device will be created and the IRQ
+ *			domain will be set accordingly.
+ * @regmap_irq_line	(Optional) The IRQ the device uses to signal interrupts.
+ * @regmap_irq_flags	(Optional) The IRQF_ flags to use for the interrupt.
  *
  * The ->reg_mask_xlate translates a given base address and GPIO offset to
  * register and mask pair. The base address is one of the given register
@@ -78,6 +83,12 @@ struct gpio_regmap_config {
 	int ngpio_per_reg;
 	struct irq_domain *irq_domain;
 
+#ifdef CONFIG_REGMAP_IRQ
+	struct regmap_irq_chip *regmap_irq_chip;
+	int regmap_irq_line;
+	unsigned long regmap_irq_flags;
+#endif
+
 	int (*reg_mask_xlate)(struct gpio_regmap *gpio, unsigned int base,
 			      unsigned int offset, unsigned int *reg,
 			      unsigned int *mask);