mirror of https://gitee.com/openkylin/linux.git
61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
* SPI (Serial Peripheral Interface)
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Required properties:
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- cell-index : QE SPI subblock index.
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0: QE subblock SPI1
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1: QE subblock SPI2
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- compatible : should be "fsl,spi" or "aeroflexgaisler,spictrl".
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- mode : the SPI operation mode, it can be "cpu" or "cpu-qe".
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- reg : Offset and length of the register set for the device
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- interrupts : <a b> where a is the interrupt number and b is a
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field that represents an encoding of the sense and level
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information for the interrupt. This should be encoded based on
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the information in section 2) depending on the type of interrupt
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controller you have.
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- interrupt-parent : the phandle for the interrupt controller that
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services interrupts for this device.
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- clock-frequency : input clock frequency to non FSL_SOC cores
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Optional properties:
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- gpios : specifies the gpio pins to be used for chipselects.
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The gpios will be referred to as reg = <index> in the SPI child nodes.
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If unspecified, a single SPI device without a chip select can be used.
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Example:
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spi@4c0 {
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cell-index = <0>;
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compatible = "fsl,spi";
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reg = <4c0 40>;
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interrupts = <82 0>;
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interrupt-parent = <700>;
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mode = "cpu";
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gpios = <&gpio 18 1 // device reg=<0>
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&gpio 19 1>; // device reg=<1>
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};
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* eSPI (Enhanced Serial Peripheral Interface)
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Required properties:
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- compatible : should be "fsl,mpc8536-espi".
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- reg : Offset and length of the register set for the device.
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- interrupts : should contain eSPI interrupt, the device has one interrupt.
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- fsl,espi-num-chipselects : the number of the chipselect signals.
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Optional properties:
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- fsl,csbef: chip select assertion time in bits before frame starts
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- fsl,csaft: chip select negation time in bits after frame ends
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Example:
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spi@110000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,mpc8536-espi";
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reg = <0x110000 0x1000>;
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interrupts = <53 0x2>;
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interrupt-parent = <&mpic>;
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fsl,espi-num-chipselects = <4>;
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fsl,csbef = <1>;
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fsl,csaft = <1>;
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};
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