diff options
Diffstat (limited to 'Documentation/devicetree/bindings/powerpc')
| -rw-r--r-- | Documentation/devicetree/bindings/powerpc/fsl/dma.txt | 68 |
1 files changed, 31 insertions, 37 deletions
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt index 2a4b4bce6110..05841689c4a3 100644 --- a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt +++ b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt @@ -1,33 +1,30 @@ -* Freescale 83xx DMA Controller +* Freescale DMA Controllers -Freescale PowerPC 83xx have on chip general purpose DMA controllers. +** Freescale Elo DMA Controller + This is a little-endian 4-channel DMA controller, used in Freescale mpc83xx + series chips such as mpc8315, mpc8349, mpc8379 etc. Required properties: -- compatible : compatible list, contains 2 entries, first is - "fsl,CHIP-dma", where CHIP is the processor - (mpc8349, mpc8360, etc.) and the second is - "fsl,elo-dma" -- reg : <registers mapping for DMA general status reg> -- ranges : Should be defined as specified in 1) to describe the - DMA controller channels. +- compatible : must include "fsl,elo-dma" +- reg : DMA General Status Register, i.e. DGSR which contains + status for all the 4 DMA channels +- ranges : describes the mapping between the address space of the + DMA channels and the address space of the DMA controller - cell-index : controller index. 0 for controller @ 0x8100 -- interrupts : <interrupt mapping for DMA IRQ> +- interrupts : interrupt specifier for DMA IRQ - interrupt-parent : optional, if needed for interrupt mapping - - DMA channel nodes: - - compatible : compatible list, contains 2 entries, first is - "fsl,CHIP-dma-channel", where CHIP is the processor - (mpc8349, mpc8350, etc.) and the second is - "fsl,elo-dma-channel". However, see note below. - - reg : <registers mapping for channel> - - cell-index : dma channel index starts at 0. + - compatible : must include "fsl,elo-dma-channel" + However, see note below. + - reg : DMA channel specific registers + - cell-index : DMA channel index starts at 0. Optional properties: - - interrupts : <interrupt mapping for DMA channel IRQ> - (on 83xx this is expected to be identical to - the interrupts property of the parent node) + - interrupts : interrupt specifier for DMA channel IRQ + (on 83xx this is expected to be identical to + the interrupts property of the parent node) - interrupt-parent : optional, if needed for interrupt mapping Example: @@ -70,30 +67,27 @@ Example: }; }; -* Freescale 85xx/86xx DMA Controller - -Freescale PowerPC 85xx/86xx have on chip general purpose DMA controllers. +** Freescale EloPlus DMA Controller + This is a 4-channel DMA controller with extended addresses and chaining, + mainly used in Freescale mpc85xx/86xx, Pxxx and BSC series chips, such as + mpc8540, mpc8641 p4080, bsc9131 etc. Required properties: -- compatible : compatible list, contains 2 entries, first is - "fsl,CHIP-dma", where CHIP is the processor - (mpc8540, mpc8540, etc.) and the second is - "fsl,eloplus-dma" -- reg : <registers mapping for DMA general status reg> +- compatible : must include "fsl,eloplus-dma" +- reg : DMA General Status Register, i.e. DGSR which contains + status for all the 4 DMA channels - cell-index : controller index. 0 for controller @ 0x21000, 1 for controller @ 0xc000 -- ranges : Should be defined as specified in 1) to describe the - DMA controller channels. +- ranges : describes the mapping between the address space of the + DMA channels and the address space of the DMA controller - DMA channel nodes: - - compatible : compatible list, contains 2 entries, first is - "fsl,CHIP-dma-channel", where CHIP is the processor - (mpc8540, mpc8560, etc.) and the second is - "fsl,eloplus-dma-channel". However, see note below. - - cell-index : dma channel index starts at 0. - - reg : <registers mapping for channel> - - interrupts : <interrupt mapping for DMA channel IRQ> + - compatible : must include "fsl,eloplus-dma-channel" + However, see note below. + - cell-index : DMA channel index starts at 0. + - reg : DMA channel specific registers + - interrupts : interrupt specifier for DMA channel IRQ - interrupt-parent : optional, if needed for interrupt mapping Example: |