[PATCH v8 06/11] gpio: regmap: Allow to allocate regmap-irq device

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

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@bootlin.com>
---
 drivers/base/regmap/regmap-irq.c |  4 +++-
 drivers/gpio/gpio-regmap.c       | 21 +++++++++++++++++++--
 include/linux/gpio/regmap.h      | 11 +++++++++++
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index c1b0dcd7280f..45299d29fd0b 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -12,6 +12,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
+#include <linux/overflow.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -911,7 +912,8 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 		if (ret < 0)
 			goto err_alloc;
 
-		memcpy(d->prev_status_buf, d->status_buf, array_size(d->prev_status_buf));
+		memcpy(d->prev_status_buf, d->status_buf,
+		       array_size(d->chip->num_regs, sizeof(d->prev_status_buf[0])));
 	}
 
 	ret = regmap_irq_create_domain(fwnode, irq_base, chip, d);
diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 87c4225784cf..9cbbbaf82609 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -215,6 +215,7 @@ 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 +296,24 @@ 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) {
+		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_line,
+						      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);
+	} else
+#endif
+	irq_domain = config->irq_domain;
+
+	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 c722c67668c6..19b52ac03a5d 100644
--- a/include/linux/gpio/regmap.h
+++ b/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);

-- 
2.39.5