dw_dmac: autoconfigure data_width or get it via platform data

Not all of the controllers support the 64 bit data width. Make it configurable
via platform data. The driver will try to get a value from the component
parameters, otherwise it will use the platform data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h
index 3315ef9c785b..e1c8c9e919ac 100644
--- a/include/linux/dw_dmac.h
+++ b/include/linux/dw_dmac.h
@@ -20,6 +20,9 @@
  * @is_private: The device channels should be marked as private and not for
  *      by the general purpose DMA channel allocator.
  * @block_size: Maximum block size supported by the controller
+ * @nr_masters: Number of AHB masters supported by the controller
+ * @data_width: Maximum data width supported by hardware per AHB master
+ *              (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
  */
 struct dw_dma_platform_data {
         unsigned int    nr_channels;
@@ -31,6 +34,8 @@ struct dw_dma_platform_data {
 #define CHAN_PRIORITY_DESCENDING        1       /* chan7 highest */
         unsigned char   chan_priority;
         unsigned short  block_size;
+        unsigned char   nr_masters;
+        unsigned char   data_width[4];
 };
 
 /* bursts size */