linux-kernel - [PATCH v6 08/12] gpio: regmap: Allow to provide init_valid

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Message-Id: <20250409-mdb-max7360-support-v6-8-7a2535876e39@bootlin.com>
Date: Wed, 09 Apr 2025 16:55:55 +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 v6 08/12] gpio: regmap: Allow to provide init_valid_mask
 callback

Allows to populate the gpio_regmap_config structure with
init_valid_mask() callback to set on the final gpio_chip structure.

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
Reviewed-by: Michael Walle <mwalle@...nel.org>
---
 drivers/gpio/gpio-regmap.c  | 1 +
 include/linux/gpio/regmap.h | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index c27cc78f9025..e8987707feaf 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -256,6 +256,7 @@ 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->init_valid_mask = config->init_valid_mask;

 	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 7ed7927ae2e9..32ca4b4cccf1 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 +41,8 @@ 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).
+ * @init_valid_mask:	(Optional) Routine to initialize @valid_mask, to be used
+ *			if not all GPIOs are valid.
  * @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.
@@ -96,6 +99,10 @@ struct gpio_regmap_config {
 			      unsigned int offset, unsigned int *reg,
 			      unsigned int *mask);

+	int (*init_valid_mask)(struct gpio_chip *gc,
+			       unsigned long *valid_mask,
+			       unsigned int ngpios);
+
 	void *drvdata;
 };

-- 
2.39.5