projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d0fc2eaa KG |
1 | * SPI (Serial Peripheral Interface) |
| 2 | ||
| 3 | Required properties: | |
| f3016fa5 MH |
4 | - cell-index : QE SPI subblock index. |
| 5 | 0: QE subblock SPI1 | |
| 6 | 1: QE subblock SPI2 | |
| 447b0c7b | 7 | - compatible : should be "fsl,spi" or "aeroflexgaisler,spictrl". |
| d0fc2eaa KG |
8 | - mode : the SPI operation mode, it can be "cpu" or "cpu-qe". |
| 9 | - reg : Offset and length of the register set for the device | |
| 10 | - interrupts : <a b> where a is the interrupt number and b is a | |
| 11 | field that represents an encoding of the sense and level | |
| 12 | information for the interrupt. This should be encoded based on | |
| 13 | the information in section 2) depending on the type of interrupt | |
| 14 | controller you have. | |
| 15 | - interrupt-parent : the phandle for the interrupt controller that | |
| 16 | services interrupts for this device. | |
| e8beacbb | 17 | - clock-frequency : input clock frequency to non FSL_SOC cores |
| d0fc2eaa | 18 | |
| 85cd7467 ES |
19 | Optional properties: |
| 20 | - gpios : specifies the gpio pins to be used for chipselects. | |
| 21 | The gpios will be referred to as reg = <index> in the SPI child nodes. | |
| 22 | If unspecified, a single SPI device without a chip select can be used. | |
| 23 | ||
| d0fc2eaa KG |
24 | Example: |
| 25 | spi@4c0 { | |
| 26 | cell-index = <0>; | |
| 27 | compatible = "fsl,spi"; | |
| 28 | reg = <4c0 40>; | |
| 29 | interrupts = <82 0>; | |
| 30 | interrupt-parent = <700>; | |
| 31 | mode = "cpu"; | |
| 85cd7467 ES |
32 | gpios = <&gpio 18 1 // device reg=<0> |
| 33 | &gpio 19 1>; // device reg=<1> | |
| d0fc2eaa | 34 | }; |
| f3016fa5 MH |
35 | |
| 36 | ||
| 37 | * eSPI (Enhanced Serial Peripheral Interface) | |
| 38 | ||
| 39 | Required properties: | |
| 40 | - compatible : should be "fsl,mpc8536-espi". | |
| 41 | - reg : Offset and length of the register set for the device. | |
| 42 | - interrupts : should contain eSPI interrupt, the device has one interrupt. | |
| 43 | - fsl,espi-num-chipselects : the number of the chipselect signals. | |
| 44 | ||
| d0fb47a5 JW |
45 | Optional properties: |
| 46 | - fsl,csbef: chip select assertion time in bits before frame starts | |
| 47 | - fsl,csaft: chip select negation time in bits after frame ends | |
| 48 | ||
| f3016fa5 MH |
49 | Example: |
| 50 | spi@110000 { | |
| 51 | #address-cells = <1>; | |
| 52 | #size-cells = <0>; | |
| 53 | compatible = "fsl,mpc8536-espi"; | |
| 54 | reg = <0x110000 0x1000>; | |
| 55 | interrupts = <53 0x2>; | |
| 56 | interrupt-parent = <&mpic>; | |
| 57 | fsl,espi-num-chipselects = <4>; | |
| d0fb47a5 JW |
58 | fsl,csbef = <1>; |
| 59 | fsl,csaft = <1>; | |
| f3016fa5 | 60 | }; |