[PATCH v6 08/12] gpio: regmap: Allow to provide init_valid_mask callback

Mathieu Dubois-Briand
2025-04-09T14:56:50Z

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@bootlin.com>
Reviewed-by: Michael Walle <mwalle@kernel.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