diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-08-17 19:20:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 16:13:29 +0200 |
| commit | c072e113b8fbd6b2bf325e92379a0da6dea619b3 (patch) | |
| tree | 79c32942e7fec113c9e691544d35afa5a29d282a /include | |
| parent | 9217a5bf66061c392e461255c5d9d41aac136e58 (diff) | |
dmaengine: dw: set polarity of handshake interface
Intel Quark UART uses DesignWare DMA IP. Though the DMA IP is connected in such
way that handshake interface uses inverted polarity. We have to provide a
possibility to set this in the DMA driver when configuring a channel.
Introduce a new member of custom slave configuration called 'hs_polarity' and
set active low polarity in case this value is 'true'.
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/platform_data/dma-dw.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/platform_data/dma-dw.h b/include/linux/platform_data/dma-dw.h index d15d8ba8cc24..4636c9335305 100644 --- a/include/linux/platform_data/dma-dw.h +++ b/include/linux/platform_data/dma-dw.h @@ -23,6 +23,7 @@ * @dst_id: dst request line * @m_master: memory master for transfers on allocated channel * @p_master: peripheral master for transfers on allocated channel + * @hs_polarity:set active low polarity of handshake interface */ struct dw_dma_slave { struct device *dma_dev; @@ -30,6 +31,7 @@ struct dw_dma_slave { u8 dst_id; u8 m_master; u8 p_master; + bool hs_polarity; }; /** |