| STMicroelectronics STM32 SPI Controller |
| |
| The STM32 SPI controller is used to communicate with external devices using |
| the Serial Peripheral Interface. It supports full-duplex, half-duplex and |
| simplex synchronous serial communication with external devices. It supports |
| from 4 to 32-bit data size. Although it can be configured as master or slave, |
| only master is supported by the driver. |
| |
| Required properties: |
| - compatible: Should be one of: |
| "st,stm32h7-spi" |
| "st,stm32f4-spi" |
| - reg: Offset and length of the device's register set. |
| - interrupts: Must contain the interrupt id. |
| - clocks: Must contain an entry for spiclk (which feeds the internal clock |
| generator). |
| - #address-cells: Number of cells required to define a chip select address. |
| - #size-cells: Should be zero. |
| |
| Optional properties: |
| - resets: Must contain the phandle to the reset controller. |
| - A pinctrl state named "default" may be defined to set pins in mode of |
| operation for SPI transfer. |
| - dmas: DMA specifiers for tx and rx dma. DMA fifo mode must be used. See the |
| STM32 DMA bindings, Documentation/devicetree/bindings/dma/stm32-dma.txt. |
| - dma-names: DMA request names should include "tx" and "rx" if present. |
| - cs-gpios: list of GPIO chip selects. See the SPI bus bindings, |
| Documentation/devicetree/bindings/spi/spi-bus.txt |
| |
| |
| Child nodes represent devices on the SPI bus |
| See ../spi/spi-bus.txt |
| |
| Optional properties: |
| - st,spi-midi-ns: Only for STM32H7, (Master Inter-Data Idleness) minimum time |
| delay in nanoseconds inserted between two consecutive data |
| frames. |
| |
| |
| Example: |
| spi2: spi@40003800 { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| compatible = "st,stm32h7-spi"; |
| reg = <0x40003800 0x400>; |
| interrupts = <36>; |
| clocks = <&rcc SPI2_CK>; |
| resets = <&rcc 1166>; |
| dmas = <&dmamux1 0 39 0x400 0x01>, |
| <&dmamux1 1 40 0x400 0x01>; |
| dma-names = "rx", "tx"; |
| pinctrl-0 = <&spi2_pins_b>; |
| pinctrl-names = "default"; |
| cs-gpios = <&gpioa 11 0>; |
| |
| aardvark@0 { |
| compatible = "totalphase,aardvark"; |
| reg = <0>; |
| spi-max-frequency = <4000000>; |
| st,spi-midi-ns = <4000>; |
| }; |
| }; |