[PATCH v5 06/11] gpio: regmap: Allow to allocate regmap-irq device

[Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>]

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

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
---
 drivers/gpio/gpio-regmap.c  | 23 +++++++++++++++++++++--
 include/linux/gpio/regmap.h | 15 +++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 05f8781b5204..61d5f48b445d 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -203,6 +203,7 @@ 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;
@@ -280,8 +281,26 @@ 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);
+	irq_domain = config->irq_domain;
+#ifdef CONFIG_GPIOLIB_IRQCHIP
+	if (config->regmap_irq_chip) {
+		struct regmap_irq_chip_data *irq_chip_data;
+
+		ret = devm_regmap_add_irq_chip_fwnode(config->parent, dev_fwnode(config->parent),
+						      config->regmap, config->regmap_irq_irqno,
+						      config->regmap_irq_flags, 0,
+						      config->regmap_irq_chip, &irq_chip_data);
+		if (ret)
+			goto err_free_gpio;
+
+		irq_domain = regmap_irq_get_domain(irq_chip_data);
+		if (config->regmap_irq_chip_data)
+			*config->regmap_irq_chip_data = irq_chip_data;
+	}
+#endif
+
+	if (irq_domain) {
+		ret = gpiochip_irqchip_add_domain(chip, irq_domain);
 		if (ret)
 			goto err_remove_gpiochip;
 	}
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index a9f7b7faf57b..55df2527b982 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -40,6 +40,14 @@ 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_chip_data: (Optional) Pointer on an regmap_irq_chip_data
+ *                      structure pointer. If set, it will be populated with a
+ *                      pointer on allocated regmap_irq data.
+ * @regmap_irq_irqno	(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 +86,13 @@ struct gpio_regmap_config {
 	int ngpio_per_reg;
 	struct irq_domain *irq_domain;
 
+#ifdef CONFIG_GPIOLIB_IRQCHIP
+	struct regmap_irq_chip *regmap_irq_chip;
+	struct regmap_irq_chip_data **regmap_irq_chip_data;
+	int regmap_irq_irqno;
+	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);

-- 
2.39.5