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, 7 insertions, 0 deletions

diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 2a1cc533f0c8..06f03914f022 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -198,6 +198,9 @@ struct dw_dma_chan {
 
         /* configuration passed via DMA_SLAVE_CONFIG */
         struct dma_slave_config dma_sconfig;
+
+        /* backlink to dw_dma */
+        struct dw_dma           *dw;
 };
 
 static inline struct dw_dma_chan_regs __iomem *
@@ -224,6 +227,10 @@ struct dw_dma {
 
         u8                      all_chan_mask;
 
+        /* hardware configuration */
+        unsigned char           nr_masters;
+        unsigned char           data_width[4];
+
         struct dw_dma_chan      chan[0];
 };