gpiolib: Update the kernel documentation - add Return sections

$ scripts/kernel-doc -v -none -Wall drivers/gpio/gpiolib* 2>&1 | grep -w warning | wc -l
67

Fix these by adding Return sections. While at it, make sure all of
Return sections use the same style.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240828164449.2777666-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

1 files changed, 34 insertions, 14 deletions

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index d0d78e0fa28c..880f1efcaca5 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -46,16 +46,19 @@ enum of_gpio_flags {
  * @propname:	property name containing gpio specifier(s)
  *
  * The function returns the count of GPIOs specified for a node.
- * Note that the empty GPIO specifiers count too. Returns either
- *   Number of gpios defined in property,
- *   -EINVAL for an incorrectly formed gpios property, or
- *   -ENOENT for a missing gpios property
+ * NOTE: The empty GPIO specifiers count too.
  *
- * Example:
- * gpios = <0
- *          &gpio1 1 2
- *          0
- *          &gpio2 3 4>;
+ * Returns:
+ * Either number of GPIOs defined in the property, or
+ * *  %-EINVAL for an incorrectly formed "gpios" property, or
+ * *  %-ENOENT for a missing "gpios" property.
+ *
+ * Example::
+ *
+ *     gpios = <0
+ *              &gpio1 1 2
+ *              0
+ *              &gpio2 3 4>;
  *
  * The above example defines four GPIOs, two of which are not specified.
  * This function will return '4'
@@ -77,6 +80,11 @@ static int of_gpio_named_count(const struct device_node *np,
  * "gpios" for the chip select lines. If we detect this, we redirect
  * the counting of "cs-gpios" to count "gpios" transparent to the
  * driver.
+ *
+ * Returns:
+ * Either number of GPIOs defined in the property, or
+ * *  %-EINVAL for an incorrectly formed "gpios" property, or
+ * *  %-ENOENT for a missing "gpios" property.
  */
 static int of_gpio_spi_cs_get_count(const struct device_node *np,
 				    const char *con_id)
@@ -373,7 +381,8 @@ static void of_gpio_flags_quirks(const struct device_node *np,
  * @index:	index of the GPIO
  * @flags:	a flags pointer to fill in
  *
- * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
+ * Returns:
+ * GPIO descriptor to use with Linux GPIO API, or one of the errno
  * value on the error condition. If @flags is not NULL the function also fills
  * in flags for the GPIO.
  */
@@ -425,7 +434,8 @@ out:
  *
  * **DEPRECATED** This function is deprecated and must not be used in new code.
  *
- * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * Returns:
+ * GPIO number to use with Linux generic GPIO API, or one of the errno
  * value on the error condition.
  */
 int of_get_named_gpio(const struct device_node *np, const char *propname,
@@ -711,7 +721,8 @@ struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id,
  *		of_find_gpio() or of_parse_own_gpio()
  * @dflags:	gpiod_flags - optional GPIO initialization flags
  *
- * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
+ * Returns:
+ * GPIO descriptor to use with Linux GPIO API, or one of the errno
  * value on the error condition.
  */
 static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
@@ -779,7 +790,8 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
  * @chip:	gpio chip to act on
  * @hog:	device node describing the hogs
  *
- * Returns error if it fails otherwise 0 on success.
+ * Returns:
+ * 0 on success, or negative errno on failure.
  */
 static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)
 {
@@ -813,7 +825,9 @@ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)
  *
  * This is only used by of_gpiochip_add to request/set GPIO initial
  * configuration.
- * It returns error if it fails otherwise 0 on success.
+ *
+ * Returns:
+ * 0 on success, or negative errno on failure.
  */
 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
 {
@@ -923,6 +937,9 @@ struct notifier_block gpio_of_notifier = {
  * This is simple translation function, suitable for the most 1:1 mapped
  * GPIO chips. This function performs only one sanity check: whether GPIO
  * is less than ngpios (that is specified in the gpio_chip).
+ *
+ * Returns:
+ * GPIO number (>= 0) on success, negative errno on failure.
  */
 static int of_gpio_simple_xlate(struct gpio_chip *gc,
 				const struct of_phandle_args *gpiospec,
@@ -972,6 +989,9 @@ static int of_gpio_simple_xlate(struct gpio_chip *gc,
  * If succeeded, this function will map bank's memory and will
  * do all necessary work for you. Then you'll able to use .regs
  * to manage GPIOs from the callbacks.
+ *
+ * Returns:
+ * 0 on success, or negative errno on failure.
  */
 int of_mm_gpiochip_add_data(struct device_node *np,
 			    struct of_mm_gpio_chip *mm_gc,