st_fdma.txt

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    1 * STMicroelectronics Flexible Direct Memory Access Device Tree bindings
    2 
    3 The FDMA is a general-purpose direct memory access controller capable of
    4 supporting 16 independent DMA channels. It accepts up to 32 DMA requests.
    5 The FDMA is based on a Slim processor which requires a firmware.
    6 
    7 * FDMA Controller
    8 
    9 Required properties:
   10 - compatible    : Should be one of
   11                  - st,stih407-fdma-mpe31-11, "st,slim-rproc";
   12                  - st,stih407-fdma-mpe31-12, "st,slim-rproc";
   13                  - st,stih407-fdma-mpe31-13, "st,slim-rproc";
   14 - reg           : Should contain an entry for each name in reg-names
   15 - reg-names     : Must contain "slimcore", "dmem", "peripherals", "imem" entries
   16 - interrupts    : Should contain one interrupt shared by all channels
   17 - dma-channels  : Number of channels supported by the controller
   18 - #dma-cells    : Must be <3>. See DMA client section below
   19 - clocks        : Must contain an entry for each clock
   20 See: Documentation/devicetree/bindings/clock/clock-bindings.txt
   21 
   22 
   23 Example:
   24 
   25         fdma0: dma-controller@8e20000 {
   26                 compatible = "st,stih407-fdma-mpe31-11", "st,slim-rproc";
   27                 reg = <0x8e20000 0x8000>,
   28                       <0x8e30000 0x3000>,
   29                       <0x8e37000 0x1000>,
   30                       <0x8e38000 0x8000>;
   31                 reg-names = "slimcore", "dmem", "peripherals", "imem";
   32                 clocks = <&clk_s_c0_flexgen CLK_FDMA>,
   33                          <&clk_s_c0_flexgen CLK_EXT2F_A9>,
   34                          <&clk_s_c0_flexgen CLK_EXT2F_A9>,
   35                          <&clk_s_c0_flexgen CLK_EXT2F_A9>;
   36                 interrupts = <GIC_SPI 5 IRQ_TYPE_NONE>;
   37                 dma-channels = <16>;
   38                 #dma-cells = <3>;
   39         };
   40 
   41 * DMA client
   42 
   43 Required properties:
   44 - dmas: Comma separated list of dma channel requests
   45 - dma-names: Names of the aforementioned requested channels
   46 
   47 Each dmas request consists of 4 cells:
   48 1. A phandle pointing to the FDMA controller
   49 2. The request line number
   50 3. A 32bit mask specifying (see include/linux/platform_data/dma-st-fdma.h)
   51  -bit 2-0: Holdoff value, dreq will be masked for
   52         0x0: 0-0.5us
   53         0x1: 0.5-1us
   54         0x2: 1-1.5us
   55  -bit 17: data swap
   56         0x0: disabled
   57         0x1: enabled
   58  -bit 21: Increment Address
   59         0x0: no address increment between transfers
   60         0x1: increment address between transfers
   61  -bit 22: 2 STBus Initiator Coprocessor interface
   62         0x0: high priority port
   63         0x1: low priority port
   64 4. transfers type
   65  0 free running
   66  1 paced
   67 
   68 Example:
   69 
   70         sti_uni_player2: sti-uni-player@2 {
   71                 compatible = "st,sti-uni-player";
   72                 #sound-dai-cells = <0>;
   73                 st,syscfg = <&syscfg_core>;
   74                 clocks = <&clk_s_d0_flexgen CLK_PCM_2>;
   75                 assigned-clocks = <&clk_s_d0_flexgen CLK_PCM_2>;
   76                 assigned-clock-parents = <&clk_s_d0_quadfs 2>;
   77                 assigned-clock-rates = <50000000>;
   78                 reg = <0x8D82000 0x158>;
   79                 interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
   80                 dmas = <&fdma0 4 0 1>;
   81                 dai-name = "Uni Player #1 (DAC)";
   82                 dma-names = "tx";
   83                 st,uniperiph-id = <2>;
   84                 st,version = <5>;
   85                 st,mode = "PCM";
   86         };

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sys/contrib/device-tree/Bindings/dma/st_fdma.txt