dmaengine: altera-msgdma: Fix struct documentation blocks

Fix some misspelling/description issues, demote non-kerneldoc header
to standard comment block and provide a new description for
msgdma_desc_config()'s 'stride' parameter.

Fixes the following W=1 kernel build warning(s):

 drivers/dma/altera-msgdma.c:163: warning: Function parameter or member 'node' not described in 'msgdma_sw_desc'
 drivers/dma/altera-msgdma.c:163: warning: Function parameter or member 'tx_list' not described in 'msgdma_sw_desc'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'lock' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'dev' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'irq_tasklet' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'pending_list' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'free_list' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'active_list' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'done_list' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'desc_free_cnt' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'idle' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'dmadev' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'dmachan' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'hw_desq' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'sw_desq' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'npendings' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'slave_cfg' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'irq' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'csr' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'desc' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:197: warning: Function parameter or member 'resp' not described in 'msgdma_device'
 drivers/dma/altera-msgdma.c:265: warning: Function parameter or member 'stride' not described in 'msgdma_desc_config'

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Cc: Stefan Roese <sr@denx.de>
Link: https://lore.kernel.org/r/20200714111546.1755231-8-lee.jones@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/altera-msgdma.c

@@ -153,7 +153,8 @@ struct msgdma_extended_desc {
  * struct msgdma_sw_desc - implements a sw descriptor
  * @async_tx: support for the async_tx api
  * @hw_desc: assosiated HW descriptor
- * @free_list: node of the free SW descriprots list
+ * @node: node to move from the free list to the tx list
+ * @tx_list: transmit list node
  */
 struct msgdma_sw_desc {
 	struct dma_async_tx_descriptor async_tx;
@@ -162,7 +163,7 @@ struct msgdma_sw_desc {
 	struct list_head tx_list;
 };
 
-/**
+/*
  * struct msgdma_device - DMA device structure
  */
 struct msgdma_device {
@@ -258,6 +259,7 @@ static void msgdma_free_desc_list(struct msgdma_device *mdev,
  * @dst: Destination buffer address
  * @src: Source buffer address
  * @len: Transfer length
+ * @stride: Read/write stride value to set
  */
 static void msgdma_desc_config(struct msgdma_extended_desc *desc,
 			       dma_addr_t dst, dma_addr_t src, size_t len,