On 09/13/2012 04:00 PM, Jon Hunter wrote: > This is based upon the work by Benoit Cousson [1] and Nicolas Ferre [2] > to add some basic helpers to retrieve a DMA controller device_node and the > DMA request/channel information. > diff --git a/Documentation/devicetree/bindings/dma/dma.txt b/Documentation/devicetree/bindings/dma/dma.txt > +* Generic DMA Controller and DMA request bindings > + > +Generic binding to provide a way for a driver using DMA Engine to retrieve the > +DMA request or channel information that goes from a hardware device to a DMA > +controller. > + > + > +* DMA controller > + > +Required property: > +- #dma-cells: Must be at least 1. Used to provide DMA controller > + specific information. See DMA client binding below for ... > +* DMA client > + > +Client drivers should specify the DMA property using a phandle to the controller > +followed by DMA controller specific data. > + > +Required property: > +- dmas: List of one or more DMA specifiers, each consisting of > + - A phandle pointing to DMA controller node > + - A single integer cell containing DMA controller > + specific information. This typically contains a dma > + request line number or a channel number, but can > + contain any data that is used required for configuring > + a channel. "A single integer cell" doesn't sound correct; shouldn't this be something like "a number of integer cells, as determined by the #dma-cells property in the node referenced by phandle"? > +- dma-names: Contains one identifier string for each dma specifier in > + the dmas property. The specific strings that can be used > + are defined in the binding of the DMA client device. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
