regulator: Add ena_gpio_initialized to regulator_config
Most drivers do not set the ena_gpio field of struct regulator_config
before passing it to the regulator core. This is fine as long as the
gpio identifier that is passed is a positive integer. But the gpio
identifier 0 is also valid. So we are not able to decide wether we got a
real gpio identifier or not based on a 0 in ena_gpio.
To be able to decide if it is a valid gpio that got passed, this patch
adds a ena_gpio_initialized field that should be set if was initialized
with a correct value, either a gpio >= 0 or a negative error number. The
core then checks if ena_gpio or ena_gpio_initialized before handling it
as a gpio. This way we maintain backwards compatibility and fix the
behaviour for gpio number 0.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index fc0ee0c..28da08e 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -301,6 +301,9 @@
* NULL).
* @regmap: regmap to use for core regmap helpers if dev_get_regulator() is
* insufficient.
+ * @ena_gpio_initialized: GPIO controlling regulator enable was properly
+ * initialized, meaning that >= 0 is a valid gpio
+ * identifier and < 0 is a non existent gpio.
* @ena_gpio: GPIO controlling regulator enable.
* @ena_gpio_invert: Sense for GPIO enable control.
* @ena_gpio_flags: Flags to use when calling gpio_request_one()
@@ -312,6 +315,7 @@
struct device_node *of_node;
struct regmap *regmap;
+ bool ena_gpio_initialized;
int ena_gpio;
unsigned int ena_gpio_invert:1;
unsigned int ena_gpio_flags;