On Mon, 30 Oct 2017 15:46:51 +0200 Horia Geantă <horia.geanta@xxxxxxx> wrote: > +===================================================================== > +CAAM DMA Node > + > + Child node of the crypto node that enables the use of the DMA capabilities > + of the CAAM by a stand-alone driver. The only required property is the > + "compatible" property. All the other properties are determined from > + the job rings on which the CAAM DMA driver depends (ex: the number of > + dma-channels is equal to the number of defined job rings). > + > + - compatible > + Usage: required > + Value type: <string> > + Definition: Must include "fsl,sec-v4.0-dma" > + > +EXAMPLE > + caam-dma { > + compatible = "fsl,sec-v5.4-dma", > + "fsl,sec-v5.0-dma", > + "fsl,sec-v4.0-dma"; > + } If this isn't describing an aspect of the hardware, then what is it doing in the device tree? Kim