0001 * SPI (Serial Peripheral Interface)
0002
0003 Required properties:
0004 - cell-index : QE SPI subblock index.
0005 0: QE subblock SPI1
0006 1: QE subblock SPI2
0007 - compatible : should be "fsl,spi" or "aeroflexgaisler,spictrl".
0008 - mode : the SPI operation mode, it can be "cpu" or "cpu-qe".
0009 - reg : Offset and length of the register set for the device
0010 - interrupts : <a b> where a is the interrupt number and b is a
0011 field that represents an encoding of the sense and level
0012 information for the interrupt. This should be encoded based on
0013 the information in section 2) depending on the type of interrupt
0014 controller you have.
0015 - clock-frequency : input clock frequency to non FSL_SOC cores
0016
0017 Optional properties:
0018 - cs-gpios : specifies the gpio pins to be used for chipselects.
0019 The gpios will be referred to as reg = <index> in the SPI child nodes.
0020 If unspecified, a single SPI device without a chip select can be used.
0021 - fsl,spisel_boot : for the MPC8306 and MPC8309, specifies that the
0022 SPISEL_BOOT signal is used as chip select for a slave device. Use
0023 reg = <number of gpios> in the corresponding child node, i.e. 0 if
0024 the cs-gpios property is not present.
0025
0026 Example:
0027 spi@4c0 {
0028 cell-index = <0>;
0029 compatible = "fsl,spi";
0030 reg = <4c0 40>;
0031 interrupts = <82 0>;
0032 interrupt-parent = <700>;
0033 mode = "cpu";
0034 cs-gpios = <&gpio 18 1 // device reg=<0>
0035 &gpio 19 1>; // device reg=<1>
0036 };
0037
0038
0039 * eSPI (Enhanced Serial Peripheral Interface)
0040
0041 Required properties:
0042 - compatible : should be "fsl,mpc8536-espi".
0043 - reg : Offset and length of the register set for the device.
0044 - interrupts : should contain eSPI interrupt, the device has one interrupt.
0045 - fsl,espi-num-chipselects : the number of the chipselect signals.
0046
0047 Optional properties:
0048 - fsl,csbef: chip select assertion time in bits before frame starts
0049 - fsl,csaft: chip select negation time in bits after frame ends
0050
0051 Example:
0052 spi@110000 {
0053 #address-cells = <1>;
0054 #size-cells = <0>;
0055 compatible = "fsl,mpc8536-espi";
0056 reg = <0x110000 0x1000>;
0057 interrupts = <53 0x2>;
0058 interrupt-parent = <&mpic>;
0059 fsl,espi-num-chipselects = <4>;
0060 fsl,csbef = <1>;
0061 fsl,csaft = <1>;
0062 };
