Commit e2d896c0 authored Jan 24, 2019 by John Stultz Committed by Vinod Koul Feb 04, 2019

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>

parent 50fdb52a

Documentation/devicetree/bindings/dma/dma.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,9 @@ Optional properties:
		- dma-channels: Number of DMA channels supported by the controller.
		- dma-requests: Number of DMA request signals supported by the
		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:

		@@ -29,6 +32,7 @@ Example:
		#dma-cells = <1>;
		dma-channels = <32>;
		dma-requests = <127>;
		dma-channel-mask = <0xfffe>
		};

		* DMA router