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62 lines
2.1 KiB
62 lines
2.1 KiB
* 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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- clock-frequency : input clock frequency to non FSL_SOC cores |
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Optional properties: |
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- cs-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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- fsl,spisel_boot : for the MPC8306 and MPC8309, specifies that the |
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SPISEL_BOOT signal is used as chip select for a slave device. Use |
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reg = <number of gpios> in the corresponding child node, i.e. 0 if |
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the cs-gpios property is not present. |
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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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cs-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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