regulator: Unify "negative error number" terminology in comments

Previous commits cleaning up kerneldoc used the term "negative error
number" to refer to error condition return values. Update remaining
instances of other terminology such as "error code" or "errno" as
well so the whole regulator subsystem is unified.

Signed-off-by: Chen-Yu Tsai <[e-mail]>
Reported-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/core.c

···
  *         voltage selectors.
  *
  * On success, the output parameters @vsel_reg and @vsel_mask are filled in
- * and 0 is returned, otherwise a negative errno is returned.
+ * and 0 is returned, otherwise a negative error number is returned.
  */
 int regulator_get_hardware_vsel_register(struct regulator *regulator,
 					 unsigned *vsel_reg,

drivers/regulator/devres.c

···
  * In cases where the supply is not strictly required, callers can check for
  * -ENODEV error and handle it accordingly.
  *
- * Returns: voltage in microvolts on success, or an error code on failure.
+ * Returns: voltage in microvolts on success, or an negative error number on failure.
  */
 int devm_regulator_get_enable_read_voltage(struct device *dev, const char *id)
 {
···
 	 * Since we need a real voltage, we use devm_regulator_get_optional()
 	 * rather than getting a dummy regulator with devm_regulator_get() and
 	 * then letting regulator_get_voltage() fail with -EINVAL. This way, the
-	 * caller can handle the -ENODEV error code if needed instead of the
-	 * ambiguous -EINVAL.
+	 * caller can handle the -ENODEV negative error number if needed instead
+	 * of the ambiguous -EINVAL.
 	 */
 	r = devm_regulator_get_optional(dev, id);
 	if (IS_ERR(r))
···
  * @num_consumers: number of consumers to register
  * @consumers:     configuration of consumers; clients are stored here.
  *
- * @return 0 on success, an errno on failure.
+ * @return 0 on success, a negative error number on failure.
  *
  * This helper function allows drivers to get several regulator
  * consumers in one operation with management, the regulators will
···
  * @num_consumers: number of consumers to register
  * @consumers:     configuration of consumers; clients are stored here.
  *
- * @return 0 on success, an errno on failure.
+ * @return 0 on success, a negative error number on failure.
  *
  * This helper function allows drivers to exclusively get several
  * regulator consumers in one operation with management, the regulators
···
  * This is a convenience function to allow bulk regulator configuration
  * to be stored "static const" in files.
  *
- * Return: 0 on success, an errno on failure.
+ * Return: 0 on success, a negative error number on failure.
  */
 int devm_regulator_bulk_get_const(struct device *dev, int num_consumers,
 				  const struct regulator_bulk_data *in_consumers,
···
  * @num_consumers: number of consumers to register
  * @id:            list of supply names or regulator IDs
  *
- * @return 0 on success, an errno on failure.
+ * @return 0 on success, a negative error number on failure.
  *
  * This helper function allows drivers to get several regulator
  * consumers in one operation with management, the regulators will
···
  *             lookup the supply
  * @num_id:    number of aliases to register
  *
- * @return 0 on success, an errno on failure.
+ * @return 0 on success, a negative error number on failure.
  *
  * This helper function allows drivers to register several supply
  * aliases in one operation, the aliases will be automatically
···
  *			IRQ.
  * @rdev_amount:	Amount of regulators associated with this IRQ.
  *
- * Return: handle to irq_helper or an ERR_PTR() encoded error code.
+ * Return: handle to irq_helper or an ERR_PTR() encoded negative error number.
  */
 void *devm_regulator_irq_helper(struct device *dev,
 				const struct regulator_irq_desc *d, int irq,

drivers/regulator/fixed.c

···
  * If it's an optional IRQ and not found, it returns 0.
  * Otherwise, it attempts to request the threaded IRQ.
  *
- * Return: 0 on success, or error code on failure.
+ * Return: 0 on success, or a negative error number on failure.
  */
 static int reg_fixed_get_irqs(struct device *dev,
 			      struct fixed_voltage_data *priv)

drivers/regulator/irq_helpers.c

···
  *			IRQ.
  * @rdev_amount:	Amount of regulators associated with this IRQ.
  *
- * Return: handle to irq_helper or an ERR_PTR() encoded error code.
+ * Return: handle to irq_helper or an ERR_PTR() encoded negative error number.
  */
 void *regulator_irq_helper(struct device *dev,
 			   const struct regulator_irq_desc *d, int irq,

drivers/regulator/max77802-regulator.c

···
  * Enable Control Logic3 by PWRREQ (LDO 3)
  *
  * If setting the regulator mode fails, the function only warns but does
- * not return an error code to avoid the regulator core to stop setting
- * the operating mode for the remaining regulators.
+ * not return a negative error number to avoid the regulator core to stop
+ * setting the operating mode for the remaining regulators.
  */
 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 				     unsigned int mode)

drivers/regulator/qcom-rpmh-regulator.c

···
  * @wait_for_ack:	Boolean indicating if execution must wait until the
  *			request has been acknowledged as complete
  *
- * Return: 0 on success, errno on failure
+ * Return: 0 on success, or a negative error number on failure
  */
 static int rpmh_regulator_send_request(struct rpmh_vreg *vreg,
 			struct tcs_cmd *cmd, bool wait_for_ack)
···
  * This function is used in the regulator_ops for VRM type RPMh regulator
  * devices.
  *
- * Return: 0 on success, errno on failure
+ * Return: 0 on success, or a negative error number on failure
  */
 static unsigned int rpmh_regulator_vrm_get_optimum_mode(
 	struct regulator_dev *rdev, int input_uV, int output_uV, int load_uA)
···
  * @pmic_rpmh_data:	Pointer to a null-terminated array of rpmh-regulator
  *			resources defined for the top level PMIC device
  *
- * Return: 0 on success, errno on failure
+ * Return: 0 on success, or a negative error number on failure
  */
 static int rpmh_regulator_init_vreg(struct rpmh_vreg *vreg, struct device *dev,
 			struct device_node *node, const char *pmic_id,

drivers/regulator/qcom_smd-regulator.c

···
  * @pmic_rpm_data:	Pointer to a null-terminated array of qcom_smd-regulator
  *			resources defined for the top level PMIC device
  *
- * Return: 0 on success, errno on failure
+ * Return: 0 on success, or a negative error number on failure
  */
 static int rpm_regulator_init_vreg(struct qcom_rpm_reg *vreg, struct device *dev,
 				   struct device_node *node,