linux-kernel - [PATCH v10 06/11] gpio: regmap: Allow to allocate regmap-irq device

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Message-Id: <20250530-mdb-max7360-support-v10-6-ce3b9e60a588@bootlin.com>
Date: Fri, 30 May 2025 12:00:14 +0200
From: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
To: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Kamel Bouhara <kamel.bouhara@...tlin.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 Uwe Kleine-König <ukleinek@...nel.org>, 
 Michael Walle <mwalle@...nel.org>, Mark Brown <broonie@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, linux-input@...r.kernel.org, 
 linux-pwm@...r.kernel.org, andriy.shevchenko@...el.com, 
 Grégory Clement <gregory.clement@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
Subject: [PATCH v10 06/11] gpio: regmap: Allow to allocate regmap-irq
 device

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@...tlin.com>
---
 drivers/gpio/gpio-regmap.c  | 29 +++++++++++++++++++++++++++--
 include/linux/gpio/regmap.h | 11 +++++++++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 87c4225784cf..039dbe70d009 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/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);
 }
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