On 10/05/2015 06:10 AM, Jon Hunter wrote:
Add device-tree binding documentation for the Tegra210 Audio DMA controller.
diff --git a/Documentation/devicetree/bindings/dma/tegra210-adma.txt b/Documentation/devicetree/bindings/dma/tegra210-adma.txt
+- #dma-cells : Must be <2>. The first cell denotes the transmit or + receive request number and should be between 1 and the maximum number + of requests supported (see properties "dma-rx-requests" and + "dma-tx-requests"). This value corresponds to the RX/TX_REQUEST_SELECT + fields in the ADMA_CHn_CTRL register. The second cell denotes whether + the channel is a receive or transmit channel and must be either 2 for + a receive channel and 4 for a transmit channel. These values correspond + to the TRANSFER_DIRECTION field of the ADMA_CHn_CTRL register.
Is it typical to encode the direction into the dma cells? I would have thought the client would provide that information at run-time when requesting a DMA channel.
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