1* Freescale (Enhanced) Configurable Serial Peripheral Interface 2 (CSPI/eCSPI) for i.MX 3 4Required properties: 5- compatible : 6 - "fsl,imx1-cspi" for SPI compatible with the one integrated on i.MX1 7 - "fsl,imx21-cspi" for SPI compatible with the one integrated on i.MX21 8 - "fsl,imx27-cspi" for SPI compatible with the one integrated on i.MX27 9 - "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31 10 - "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35 11 - "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51 12 - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53 and later Soc 13 - "fsl,imx8mq-ecspi" for SPI compatible with the one integrated on i.MX8M 14- reg : Offset and length of the register set for the device 15- interrupts : Should contain CSPI/eCSPI interrupt 16- clocks : Clock specifiers for both ipg and per clocks. 17- clock-names : Clock names should include both "ipg" and "per" 18See the clock consumer binding, 19 Documentation/devicetree/bindings/clock/clock-bindings.txt 20 21Recommended properties: 22- cs-gpios : GPIOs to use as chip selects, see spi-bus.txt. While the native chip 23select lines can be used, they appear to always generate a pulse between each 24word of a transfer. Most use cases will require GPIO based chip selects to 25generate a valid transaction. 26 27Optional properties: 28- num-cs : Number of total chip selects, see spi-bus.txt. 29- dmas: DMA specifiers for tx and rx dma. See the DMA client binding, 30Documentation/devicetree/bindings/dma/dma.txt. 31- dma-names: DMA request names, if present, should include "tx" and "rx". 32- fsl,spi-rdy-drctl: Integer, representing the value of DRCTL, the register 33controlling the SPI_READY handling. Note that to enable the DRCTL consideration, 34the SPI_READY mode-flag needs to be set too. 35Valid values are: 0 (disabled), 1 (edge-triggered burst) and 2 (level-triggered burst). 36 37Obsolete properties: 38- fsl,spi-num-chipselects : Contains the number of the chipselect 39 40Example: 41 42ecspi@70010000 { 43 #address-cells = <1>; 44 #size-cells = <0>; 45 compatible = "fsl,imx51-ecspi"; 46 reg = <0x70010000 0x4000>; 47 interrupts = <36>; 48 cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */ 49 <&gpio3 25 0>; /* GPIO3_25 */ 50 dmas = <&sdma 3 7 1>, <&sdma 4 7 2>; 51 dma-names = "rx", "tx"; 52 fsl,spi-rdy-drctl = <1>; 53}; 54