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gpio: regmap: Allow ngpio to be read from the property

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GPIOLIB supports the case when number of supported GPIOs can be read
from the device property. Enable this for drivers that are using
GPIO regmap layer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Reviewed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Link: https://lore.kernel.org/r/20250213195621.3133406-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Andy Shevchenko 2025-02-13 21:48:50 +02:00 committed by Bartosz Golaszewski
parent a630d3960b
commit db30516188
2 changed files with 10 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

13
drivers/gpio/gpio-regmap.c
View file

@ -17,6 +17,8 @@
#include <linux/gpio/driver.h>
#include <linux/gpio/regmap.h>
#include "gpiolib.h"
struct gpio_regmap {
struct device *parent;
struct regmap *regmap;
@ -210,9 +212,6 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
if (!config->parent)
return ERR_PTR(-EINVAL);
if (!config->ngpio)
return ERR_PTR(-EINVAL);
/* we need at least one */
if (!config->reg_dat_base && !config->reg_set_base)
return ERR_PTR(-EINVAL);
@ -243,7 +242,6 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
chip->parent = config->parent;
chip->fwnode = config->fwnode;
chip->base = -1;
chip->ngpio = config->ngpio;
chip->names = config->names;
chip->label = config->label ?: dev_name(config->parent);
chip->can_sleep = regmap_might_sleep(config->regmap);
@ -262,6 +260,13 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
chip->direction_output = gpio_regmap_direction_output;
}
chip->ngpio = config->ngpio;
if (!chip->ngpio) {
ret = gpiochip_get_ngpios(chip, chip->parent);
if (ret)
return ERR_PTR(ret);
}
/* if not set, assume there is only one register */
gpio->ngpio_per_reg = config->ngpio_per_reg;
if (!gpio->ngpio_per_reg)

2
include/linux/gpio/regmap.h
View file

@ -21,7 +21,7 @@ struct regmap;
* If not given, the fwnode of the parent is used.
* @label: (Optional) Descriptive name for GPIO controller.
* If not given, the name of the device is used.
* @ngpio: Number of GPIOs
* @ngpio: (Optional) Number of GPIOs
* @names: (Optional) Array of names for gpios
* @reg_dat_base: (Optional) (in) register base address
* @reg_set_base: (Optional) set register base address