thunderbolt: Update nvm.c function documentation

Make nvm.c function documentation compliant with current kernel-doc
standards. No functional changes.

Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: aborzesz

drivers/thunderbolt/nvm.c

@@ -278,9 +278,13 @@ static const struct tb_nvm_vendor retimer_nvm_vendors[] = {
  * tb_nvm_alloc() - Allocate new NVM structure
  * @dev: Device owning the NVM
  *
- * Allocates new NVM structure with unique @id and returns it. In case
- * of error returns ERR_PTR(). Specifically returns %-EOPNOTSUPP if the
- * NVM format of the @dev is not known by the kernel.
+ * Allocates new NVM structure with unique @id and returns it.
+ *
+ * Return:
+ * * Pointer to &struct tb_nvm - On success.
+ * * %-EOPNOTSUPP - If the NVM format of the @dev is not known by the
+ *   kernel.
+ * * %ERR_PTR - In case of failure.
  */
 struct tb_nvm *tb_nvm_alloc(struct device *dev)
 {
@@ -347,9 +351,10 @@ struct tb_nvm *tb_nvm_alloc(struct device *dev)
  * tb_nvm_read_version() - Read and populate NVM version
  * @nvm: NVM structure
  *
- * Uses vendor specific means to read out and fill in the existing
- * active NVM version. Returns %0 in case of success and negative errno
- * otherwise.
+ * Uses vendor specific means to read and fill out the existing
+ * active NVM version.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_read_version(struct tb_nvm *nvm)
 {
@@ -365,12 +370,11 @@ int tb_nvm_read_version(struct tb_nvm *nvm)
  * tb_nvm_validate() - Validate new NVM image
  * @nvm: NVM structure
  *
- * Runs vendor specific validation over the new NVM image and if all
- * checks pass returns %0. As side effect updates @nvm->buf_data_start
- * and @nvm->buf_data_size fields to match the actual data to be written
- * to the NVM.
+ * Runs vendor specific validation over the new NVM image. As a
+ * side effect, updates @nvm->buf_data_start and @nvm->buf_data_size
+ * fields to match the actual data to be written to the NVM.
  *
- * If the validation does not pass then returns negative errno.
+ * Return: %0 on successful validation, negative errno otherwise.
  */
 int tb_nvm_validate(struct tb_nvm *nvm)
 {
@@ -405,7 +409,7 @@ int tb_nvm_validate(struct tb_nvm *nvm)
  * the image, this function does that. Can be called even if the device
  * does not need this.
  *
- * Returns %0 in case of success and negative errno otherwise.
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_write_headers(struct tb_nvm *nvm)
 {
@@ -423,7 +427,8 @@ int tb_nvm_write_headers(struct tb_nvm *nvm)
  * Registers new active NVmem device for @nvm. The @reg_read is called
  * directly from NVMem so it must handle possible concurrent access if
  * needed. The first parameter passed to @reg_read is @nvm structure.
- * Returns %0 in success and negative errno otherwise.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_add_active(struct tb_nvm *nvm, nvmem_reg_read_t reg_read)
 {
@@ -461,6 +466,11 @@ int tb_nvm_add_active(struct tb_nvm *nvm, nvmem_reg_read_t reg_read)
  * Helper function to cache the new NVM image before it is actually
  * written to the flash. Copies @bytes from @val to @nvm->buf starting
  * from @offset.
+ *
+ * Return:
+ * * %0 - On success.
+ * * %-ENOMEM - If buffer allocation failed.
+ * * Negative errno - Another error occurred.
  */
 int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
 		     size_t bytes)
@@ -488,7 +498,7 @@ int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
  * needed. The first parameter passed to @reg_write is @nvm structure.
  * The size of the NVMem device is set to %NVM_MAX_SIZE.
  *
- * Returns %0 in success and negative errno otherwise.
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_add_non_active(struct tb_nvm *nvm, nvmem_reg_write_t reg_write)
 {
@@ -545,7 +555,7 @@ void tb_nvm_free(struct tb_nvm *nvm)
  * This is a generic function that reads data from NVM or NVM like
  * device.
  *
- * Returns %0 on success and negative errno otherwise.
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_read_data(unsigned int address, void *buf, size_t size,
 		     unsigned int retries, read_block_fn read_block,
@@ -592,7 +602,7 @@ int tb_nvm_read_data(unsigned int address, void *buf, size_t size,
  *
  * This is generic function that writes data to NVM or NVM like device.
  *
- * Returns %0 on success and negative errno otherwise.
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_nvm_write_data(unsigned int address, const void *buf, size_t size,
 		      unsigned int retries, write_block_fn write_block,