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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>
This commit is contained in:
Markus Pargmann 2014-10-08 15:47:05 +02:00 committed by Mark Brown
parent f114040e3e
commit 76f439df50
2 changed files with 6 additions and 1 deletions
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3
drivers/regulator/core.c
View File

@ -3650,7 +3650,8 @@ regulator_register(const struct regulator_desc *regulator_desc,
dev_set_drvdata(&rdev->dev, rdev);
if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
if ((config->ena_gpio || config->ena_gpio_initialized) &&
gpio_is_valid(config->ena_gpio)) {
ret = regulator_ena_gpio_request(rdev, config);
if (ret != 0) {
rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",

4
include/linux/regulator/driver.h
View File

@ -301,6 +301,9 @@ struct regulator_desc {
* 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 regulator_config {
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;