[PATCH 1/5] regulator: Add ena_gpio_valid config

[mpa@pengutronix.de (Markus Pargmann)]

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.

To be able to decide if it is a valid gpio that got passed, this patch
adds a ena_gpio_valid field that should be set if ena_gpio is a valid
gpio and should be used. It is a preperation patch for multiple patches
that adapt the drivers and fix the regulator core checks for this field.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 include/linux/regulator/driver.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index bbe03a1924c0..c561f0faaf61 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -292,6 +292,8 @@ struct regulator_desc {
  *           NULL).
  * @regmap: regmap to use for core regmap helpers if dev_get_regulator() is
  *          insufficient.
+ * @ena_gpio_valid: GPIO controlling regulator enable is valid and should be
+ *                  used.
  * @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()
@@ -303,6 +305,7 @@ struct regulator_config {
 	struct device_node *of_node;
 	struct regmap *regmap;
 
+	bool ena_gpio_valid;
 	int ena_gpio;
 	unsigned int ena_gpio_invert:1;
 	unsigned int ena_gpio_flags;
-- 
2.1.0