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