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Diffstat (limited to 'Documentation/devicetree/bindings/dma/renesas,shdma.txt')
-rw-r--r-- | Documentation/devicetree/bindings/dma/renesas,shdma.txt | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/Documentation/devicetree/bindings/dma/renesas,shdma.txt b/Documentation/devicetree/bindings/dma/renesas,shdma.txt deleted file mode 100644 index a91920a49433..000000000000 --- a/Documentation/devicetree/bindings/dma/renesas,shdma.txt +++ /dev/null @@ -1,84 +0,0 @@ -* SHDMA Device Tree bindings - -Sh-/r-mobile and R-Car systems often have multiple identical DMA controller -instances, capable of serving any of a common set of DMA slave devices, using -the same configuration. To describe this topology we require all compatible -SHDMA DT nodes to be placed under a DMA multiplexer node. All such compatible -DMAC instances have the same number of channels and use the same DMA -descriptors. Therefore respective DMA DT bindings can also all be placed in the -multiplexer node. Even if there is only one such DMAC instance on a system, it -still has to be placed under such a multiplexer node. - -* DMA multiplexer - -Required properties: -- compatible: should be "renesas,shdma-mux" -- #dma-cells: should be <1>, see "dmas" property below - -Optional properties (currently unused): -- dma-channels: number of DMA channels -- dma-requests: number of DMA request signals - -* DMA controller - -Required properties: -- compatible: should be of the form "renesas,shdma-<soc>", where <soc> should - be replaced with the desired SoC model, e.g. - "renesas,shdma-r8a73a4" for the system DMAC on r8a73a4 SoC - -Example: - dmac: dma-multiplexer@0 { - compatible = "renesas,shdma-mux"; - #dma-cells = <1>; - dma-channels = <20>; - dma-requests = <256>; - #address-cells = <2>; - #size-cells = <2>; - ranges; - - dma0: dma-controller@e6700020 { - compatible = "renesas,shdma-r8a73a4"; - reg = <0 0xe6700020 0 0x89e0>; - interrupt-parent = <&gic>; - interrupts = <0 220 4 - 0 200 4 - 0 201 4 - 0 202 4 - 0 203 4 - 0 204 4 - 0 205 4 - 0 206 4 - 0 207 4 - 0 208 4 - 0 209 4 - 0 210 4 - 0 211 4 - 0 212 4 - 0 213 4 - 0 214 4 - 0 215 4 - 0 216 4 - 0 217 4 - 0 218 4 - 0 219 4>; - interrupt-names = "error", - "ch0", "ch1", "ch2", "ch3", - "ch4", "ch5", "ch6", "ch7", - "ch8", "ch9", "ch10", "ch11", - "ch12", "ch13", "ch14", "ch15", - "ch16", "ch17", "ch18", "ch19"; - }; - }; - -* DMA client - -Required properties: -- dmas: a list of <[DMA multiplexer phandle] [MID/RID value]> pairs, - where MID/RID values are fixed handles, specified in the SoC - manual -- dma-names: a list of DMA channel names, one per "dmas" entry - -Example: - dmas = <&dmac 0xd1 - &dmac 0xd2>; - dma-names = "tx", "rx"; |