dmaengine: mv_xor_v2: Supply some missing 'struct mv_xor_v2_device' attribute docs

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

 drivers/dma/mv_xor_v2.c:168: warning: Function parameter or member 'clk' not described in 'mv_xor_v2_device'
 drivers/dma/mv_xor_v2.c:168: warning: Function parameter or member 'reg_clk' not described in 'mv_xor_v2_device'
 drivers/dma/mv_xor_v2.c:168: warning: Function parameter or member 'irq_tasklet' not described in 'mv_xor_v2_device'
 drivers/dma/mv_xor_v2.c:168: warning: Function parameter or member 'hw_queue_idx' not described in 'mv_xor_v2_device'
 drivers/dma/mv_xor_v2.c:168: warning: Function parameter or member 'msi_desc' not described in 'mv_xor_v2_device'
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200714111546.1755231-16-lee.jones@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/mv_xor_v2.c

@@ -135,9 +135,11 @@ struct mv_xor_v2_descriptor {
 /**
  * struct mv_xor_v2_device - implements a xor device
  * @lock: lock for the engine
+ * @clk: reference to the 'core' clock
+ * @reg_clk: reference to the 'reg' clock
  * @dma_base: memory mapped DMA register base
  * @glob_base: memory mapped global register base
- * @irq_tasklet:
+ * @irq_tasklet: tasklet used for IRQ handling call-backs
  * @free_sw_desc: linked list of free SW descriptors
  * @dmadev: dma device
  * @dmachan: dma channel
@@ -146,6 +148,8 @@ struct mv_xor_v2_descriptor {
  * @sw_desq: SW descriptors queue
  * @desc_size: HW descriptor size
  * @npendings: number of pending descriptors (for which tx_submit has
+ * @hw_queue_idx: HW queue index
+ * @msi_desc: local interrupt descriptor information
  * been called, but not yet issue_pending)
  */
 struct mv_xor_v2_device {