UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

Documentation: bindings: dma: Add binding for dma-channel-mask 

Some dma channels can be reserved for secure mode or other
hardware on the SoC, so provide a binding for a bitmask
listing the available channels for the kernel to use.

This follows the pre-existing bcm,dma-channel-mask binding.

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: dmaengine@vger.kernel.org
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
John Stultz 2019-01-24 12:24:17 -08:00 committed by Vinod Koul
parent 50fdb52a7c
commit e2d896c08c
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/dma/dma.txt
View File

@ -16,6 +16,9 @@ Optional properties:
- dma-channels: Number of DMA channels supported by the controller. - dma-channels: Number of DMA channels supported by the controller.
- dma-requests: Number of DMA request signals supported by the - dma-requests: Number of DMA request signals supported by the
controller. controller.
- dma-channel-mask: Bitmask of available DMA channels in ascending order
that are not reserved by firmware and are available to
the kernel. i.e. first channel corresponds to LSB.
Example: Example:
@ -29,6 +32,7 @@ Example:
#dma-cells = <1>; #dma-cells = <1>;
dma-channels = <32>; dma-channels = <32>;
dma-requests = <127>; dma-requests = <127>;
dma-channel-mask = <0xfffe>
}; };
* DMA router * DMA router