1 files changed, 17 insertions, 13 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 8319101170fc..f838764993eb 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -329,7 +329,7 @@ enum dma_slave_buswidth {
  * @src_addr_width: this is the width in bytes of the source (RX)
  * register where DMA data shall be read. If the source
  * is memory this may be ignored depending on architecture.
- * Legal values: 1, 2, 4, 8.
+ * Legal values: 1, 2, 3, 4, 8, 16, 32, 64.
  * @dst_addr_width: same as src_addr_width but for destination
  * target (TX) mutatis mutandis.
  * @src_maxburst: the maximum number of words (note: words, as in
@@ -404,14 +404,16 @@ enum dma_residue_granularity {
         DMA_RESIDUE_GRANULARITY_BURST = 2,
 };
 
-/* struct dma_slave_caps - expose capabilities of a slave channel only
- *
- * @src_addr_widths: bit mask of src addr widths the channel supports
- * @dst_addr_widths: bit mask of dstn addr widths the channel supports
- * @directions: bit mask of slave direction the channel supported
- *      since the enum dma_transfer_direction is not defined as bits for each
- *      type of direction, the dma controller should fill (1 << <TYPE>) and same
- *      should be checked by controller as well
+/**
+ * struct dma_slave_caps - expose capabilities of a slave channel only
+ * @src_addr_widths: bit mask of src addr widths the channel supports.
+ *      Width is specified in bytes, e.g. for a channel supporting
+ *      a width of 4 the mask should have BIT(4) set.
+ * @dst_addr_widths: bit mask of dst addr widths the channel supports
+ * @directions: bit mask of slave directions the channel supports.
+ *      Since the enum dma_transfer_direction is not defined as bit flag for
+ *      each type, the dma controller should set BIT(<TYPE>) and same
+ *      should be checked by controller as well
  * @max_burst: max burst capability per-transfer
  * @cmd_pause: true, if pause and thereby resume is supported
  * @cmd_terminate: true, if terminate cmd is supported
@@ -678,11 +680,13 @@ struct dma_filter {
  * @dev_id: unique device ID
  * @dev: struct device reference for dma mapping api
  * @src_addr_widths: bit mask of src addr widths the device supports
+ *      Width is specified in bytes, e.g. for a device supporting
+ *      a width of 4 the mask should have BIT(4) set.
  * @dst_addr_widths: bit mask of dst addr widths the device supports
- * @directions: bit mask of slave direction the device supports since
- *      the enum dma_transfer_direction is not defined as bits for
- *      each type of direction, the dma controller should fill (1 <<
- *      <TYPE>) and same should be checked by controller as well
+ * @directions: bit mask of slave directions the device supports.
+ *      Since the enum dma_transfer_direction is not defined as bit flag for
+ *      each type, the dma controller should set BIT(<TYPE>) and same
+ *      should be checked by controller as well
  * @max_burst: max burst capability per-transfer
  * @residue_granularity: granularity of the transfer residue reported
  *      by tx_status