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authorVinod Koul <vinod.koul@intel.com>2017-11-14 10:36:09 +0530
committerVinod Koul <vinod.koul@intel.com>2017-11-14 10:36:09 +0530
commit135ab7f53cfb77bd0b215b68eed006c7825ea01e (patch)
tree64ecce9f31a7b88f16851d9deaf04af0d8611205 /Documentation/devicetree/bindings/dma
parent9c6027133626efd773fa84478c5d8c9209df41f6 (diff)
parent9b3b8171f7f4ecbbc28f3c1ae60462826a5d9072 (diff)
Merge branch 'topic/sprd' into for-linus
Kconfig and Makefile conflicts so put them in right order (sprd ones after stm ones) Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation/devicetree/bindings/dma')
-rw-r--r--Documentation/devicetree/bindings/dma/sprd-dma.txt41
1 files changed, 41 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/sprd-dma.txt b/Documentation/devicetree/bindings/dma/sprd-dma.txt
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+++ b/Documentation/devicetree/bindings/dma/sprd-dma.txt
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+* Spreadtrum DMA controller
+
+This binding follows the generic DMA bindings defined in dma.txt.
+
+Required properties:
+- compatible: Should be "sprd,sc9860-dma".
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain one interrupt shared by all channel.
+- #dma-cells: must be <1>. Used to represent the number of integer
+ cells in the dmas property of client device.
+- #dma-channels : Number of DMA channels supported. Should be 32.
+- clock-names: Should contain the clock of the DMA controller.
+- clocks: Should contain a clock specifier for each entry in clock-names.
+
+Example:
+
+Controller:
+apdma: dma-controller@20100000 {
+ compatible = "sprd,sc9860-dma";
+ reg = <0x20100000 0x4000>;
+ interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ #dma-channels = <32>;
+ clock-names = "enable";
+ clocks = <&clk_ap_ahb_gates 5>;
+};
+
+
+Client:
+DMA clients connected to the Spreadtrum DMA controller must use the format
+described in the dma.txt file, using a two-cell specifier for each channel.
+The two cells in order are:
+1. A phandle pointing to the DMA controller.
+2. The channel id.
+
+spi0: spi@70a00000{
+ ...
+ dma-names = "rx_chn", "tx_chn";
+ dmas = <&apdma 11>, <&apdma 12>;
+ ...
+};