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author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-04-27 14:15:38 +0300 |
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committer | Vinod Koul <vinod.koul@intel.com> | 2016-05-02 15:30:47 +0530 |
commit | 2e65060e803e046fc9b5ed0107494a452424845e (patch) | |
tree | 2e5adfe7ea7400586fff0623636912d2f1ded14a /Documentation/devicetree/bindings/dma | |
parent | 969f750fc63d3fd2f26eceedcdeca5878b785b2e (diff) | |
download | linux-stable-2e65060e803e046fc9b5ed0107494a452424845e.tar.gz linux-stable-2e65060e803e046fc9b5ed0107494a452424845e.tar.bz2 linux-stable-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/bindings/dma')
-rw-r--r-- | Documentation/devicetree/bindings/dma/snps-dma.txt | 7 |
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 |