spi-samsung.txt

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    1 * Samsung SPI Controller
    2 
    3 The Samsung SPI controller is used to interface with various devices such as flash
    4 and display controllers using the SPI communication interface.
    5 
    6 Required SoC Specific Properties:
    7 
    8 - compatible: should be one of the following.
    9     - samsung,s3c2443-spi: for s3c2443, s3c2416 and s3c2450 platforms
   10     - samsung,s3c6410-spi: for s3c6410 platforms
   11     - samsung,s5pv210-spi: for s5pv210 and s5pc110 platforms
   12     - samsung,exynos5433-spi: for exynos5433 compatible controllers
   13     - samsung,exynos7-spi: for exynos7 platforms <DEPRECATED>
   14 
   15 - reg: physical base address of the controller and length of memory mapped
   16   region.
   17 
   18 - interrupts: The interrupt number to the cpu. The interrupt specifier format
   19   depends on the interrupt controller.
   20 
   21 - dmas : Two or more DMA channel specifiers following the convention outlined
   22   in bindings/dma/dma.txt
   23 
   24 - dma-names: Names for the dma channels. There must be at least one channel
   25   named "tx" for transmit and named "rx" for receive.
   26 
   27 - clocks: specifies the clock IDs provided to the SPI controller; they are
   28   required for interacting with the controller itself, for synchronizing the bus
   29   and as I/O clock (the latter is required by exynos5433 and exynos7).
   30 
   31 - clock-names: string names of the clocks in the 'clocks' property; for all the
   32   the devices the names must be "spi", "spi_busclkN" (where N is determined by
   33   "samsung,spi-src-clk"), while Exynos5433 should specify a third clock
   34   "spi_ioclk" for the I/O clock.
   35 
   36 Required Board Specific Properties:
   37 
   38 - #address-cells: should be 1.
   39 - #size-cells: should be 0.
   40 
   41 Optional Board Specific Properties:
   42 
   43 - samsung,spi-src-clk: If the spi controller includes a internal clock mux to
   44   select the clock source for the spi bus clock, this property can be used to
   45   indicate the clock to be used for driving the spi bus clock. If not specified,
   46   the clock number 0 is used as default.
   47 
   48 - num-cs: Specifies the number of chip select lines supported. If
   49   not specified, the default number of chip select lines is set to 1.
   50 
   51 - cs-gpios: should specify GPIOs used for chipselects (see spi-bus.txt)
   52 
   53 - no-cs-readback: the CS line is disconnected, therefore the device should not
   54   operate based on CS signalling.
   55 
   56 SPI Controller specific data in SPI slave nodes:
   57 
   58 - The spi slave nodes should provide the following information which is required
   59   by the spi controller.
   60 
   61   - samsung,spi-feedback-delay: The sampling phase shift to be applied on the
   62     miso line (to account for any lag in the miso line). The following are the
   63     valid values.
   64 
   65       - 0: No phase shift.
   66       - 1: 90 degree phase shift sampling.
   67       - 2: 180 degree phase shift sampling.
   68       - 3: 270 degree phase shift sampling.
   69 
   70 Aliases:
   71 
   72 - All the SPI controller nodes should be represented in the aliases node using
   73   the following format 'spi{n}' where n is a unique number for the alias.
   74 
   75 
   76 Example:
   77 
   78 - SoC Specific Portion:
   79 
   80         spi_0: spi@12d20000 {
   81                 compatible = "samsung,exynos4210-spi";
   82                 reg = <0x12d20000 0x100>;
   83                 interrupts = <0 66 0>;
   84                 dmas = <&pdma0 5
   85                         &pdma0 4>;
   86                 dma-names = "tx", "rx";
   87                 #address-cells = <1>;
   88                 #size-cells = <0>;
   89         };
   90 
   91 - Board Specific Portion:
   92 
   93         spi_0: spi@12d20000 {
   94                 #address-cells = <1>;
   95                 #size-cells = <0>;
   96                 pinctrl-names = "default";
   97                 pinctrl-0 = <&spi0_bus>;
   98                 cs-gpios = <&gpa2 5 0>;
   99 
  100                 w25q80bw@0 {
  101                         #address-cells = <1>;
  102                         #size-cells = <1>;
  103                         compatible = "w25x80";
  104                         reg = <0>;
  105                         spi-max-frequency = <10000>;
  106 
  107                         controller-data {
  108                                 samsung,spi-feedback-delay = <0>;
  109                         };
  110 
  111                         partition@0 {
  112                                 label = "U-Boot";
  113                                 reg = <0x0 0x40000>;
  114                                 read-only;
  115                         };
  116 
  117                         partition@40000 {
  118                                 label = "Kernel";
  119                                 reg = <0x40000 0xc0000>;
  120                         };
  121                 };
  122         };

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