linux-kernel - [PATCH v4 04/10] gpio: regmap: Allow to provide request and free callbacks

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Message-Id: <20250214-mdb-max7360-support-v4-4-8a35c6dbb966@bootlin.com>
Date: Fri, 14 Feb 2025 12:49:54 +0100
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 v4 04/10] gpio: regmap: Allow to provide request and free
 callbacks

Allows to populate the gpio_regmap_config structure with request() and
free() callbacks to set on the final gpio_chip structure.

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
---
 drivers/gpio/gpio-regmap.c  | 2 ++
 include/linux/gpio/regmap.h | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 05f8781b5204..ba72c23bcf97 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -261,6 +261,8 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 	chip->names = config->names;
 	chip->label = config->label ?: dev_name(config->parent);
 	chip->can_sleep = regmap_might_sleep(config->regmap);
+	chip->request = config->request;
+	chip->free = config->free;

 	chip->request = gpiochip_generic_request;
 	chip->free = gpiochip_generic_free;
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index a9f7b7faf57b..16f0c33df75d 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -6,6 +6,7 @@
 struct device;
 struct fwnode_handle;
 struct gpio_regmap;
+struct gpio_chip;
 struct irq_domain;
 struct regmap;

@@ -40,6 +41,10 @@ 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).
+ * @request:		(Optional) Hook for chip-specific activation, such as
+ *			enabling module power and clock
+ * @free:		(Optional) Hook for chip-specific deactivation, such as
+ *			disabling module power and clock
  *
  * 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
@@ -83,6 +88,8 @@ struct gpio_regmap_config {
 			      unsigned int *mask);

 	void *drvdata;
+	int (*request)(struct gpio_chip *gc, unsigned int offset);
+	void (*free)(struct gpio_chip *gc, unsigned int offset);
 };

 struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config);

-- 
2.39.5