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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-04-27 14:15:38 +0300
committerVinod Koul <vinod.koul@intel.com>2016-05-02 15:30:47 +0530
commit2e65060e803e046fc9b5ed0107494a452424845e (patch)
tree2e5adfe7ea7400586fff0623636912d2f1ded14a /Documentation/devicetree
parent969f750fc63d3fd2f26eceedcdeca5878b785b2e (diff)
downloadblackbird-op-linux-2e65060e803e046fc9b5ed0107494a452424845e.tar.gz
blackbird-op-linux-2e65060e803e046fc9b5ed0107494a452424845e.zip
dmaengine: dw: revisit data_width property
There several changes are done here: - Convert the property to be in bytes Besides that this is a common practice for such property, the use of a value in bytes much more convenient than handling the encoded one. - Rename data_width to data-width in the device tree bindings The change leaves the support for the old format as well just in case someone will use a newer kernel with an old device tree blob. - While here, replace dwc_fast_ffs() by __ffs() 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@intel.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/dma/snps-dma.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/dma/snps-dma.txt b/Documentation/devicetree/bindings/dma/snps-dma.txt
index c99c1ffac199..0f5583293c9c 100644
--- a/Documentation/devicetree/bindings/dma/snps-dma.txt
+++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
@@ -13,6 +13,11 @@ Required properties:
- chan_priority: priority of channels. 0 (default): increase from chan 0->n, 1:
increase from chan n->0
- block_size: Maximum block size supported by the controller
+- data-width: Maximum data width supported by hardware per AHB master
+ (in bytes, power of 2)
+
+
+Deprecated properties:
- data_width: Maximum data width supported by hardware per AHB master
(0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
@@ -38,7 +43,7 @@ Example:
chan_allocation_order = <1>;
chan_priority = <1>;
block_size = <0xfff>;
- data_width = <3 3>;
+ data-width = <8 8>;
};
DMA clients connected to the Designware DMA controller must use the format
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