linux-kernel - [PATCH v4 05/10] gpio: regmap: Allow to retrieve ngpio

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Message-Id: <20250214-mdb-max7360-support-v4-5-8a35c6dbb966@bootlin.com>
Date: Fri, 14 Feb 2025 12:49:55 +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 05/10] gpio: regmap: Allow to retrieve ngpio

Drivers can leave the ngpio field of the gpio_regmap_config structure
uninitialized, letting gpio_regmap_register() retrieve its value from
the "ngpios" device property. Yet, the driver might still need to know
the ngpio value later: allow to extract this value from the gpio_regmap
structure.

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
---
 drivers/gpio/gpio-regmap.c  | 6 ++++++
 include/linux/gpio/regmap.h | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index ba72c23bcf97..7d8bfde386a4 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -195,6 +195,12 @@ void *gpio_regmap_get_drvdata(struct gpio_regmap *gpio)
 }
 EXPORT_SYMBOL_GPL(gpio_regmap_get_drvdata);

+u16 gpio_regmap_get_ngpio(struct gpio_regmap *gpio)
+{
+	return gpio->gpio_chip.ngpio;
+}
+EXPORT_SYMBOL_GPL(gpio_regmap_get_ngpio);
+
 /**
  * gpio_regmap_register() - Register a generic regmap GPIO controller
  * @config: configuration for gpio_regmap
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index 16f0c33df75d..0fdc213178d1 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -3,6 +3,8 @@
 #ifndef _LINUX_GPIO_REGMAP_H
 #define _LINUX_GPIO_REGMAP_H

+#include <linux/types.h>
+
 struct device;
 struct fwnode_handle;
 struct gpio_regmap;
@@ -97,5 +99,6 @@ void gpio_regmap_unregister(struct gpio_regmap *gpio);
 struct gpio_regmap *devm_gpio_regmap_register(struct device *dev,
 					      const struct gpio_regmap_config *config);
 void *gpio_regmap_get_drvdata(struct gpio_regmap *gpio);
+u16 gpio_regmap_get_ngpio(struct gpio_regmap *gpio);

 #endif /* _LINUX_GPIO_REGMAP_H */

-- 
2.39.5