linux-kernel - [PATCH 2/8 v4] Documentation: bindings: dma: Add binding for dma-channel-mask

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Date:   Wed, 16 Jan 2019 09:10:23 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tanglei Han <hantanglei@...wei.com>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 2/8 v4] 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@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Tanglei Han <hantanglei@...wei.com>
Cc: Zhuangluan Su <suzhuangluan@...ilicon.com>
Cc: Ryan Grachek <ryan@...ted.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: dmaengine@...r.kernel.org
Cc: devicetree@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v3: Renamed to hisi-dma-avail-chan
v4: Reworked to generic dma-channel-mask
---
 Documentation/devicetree/bindings/dma/dma.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/dma.txt b/Documentation/devicetree/bindings/dma/dma.txt
index 6312fb0..eeb4e4d 100644
--- a/Documentation/devicetree/bindings/dma/dma.txt
+++ b/Documentation/devicetree/bindings/dma/dma.txt
@@ -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
-- 
2.7.4