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5fd3d94332
This patch aligns example with the optional property description, removes status and replace spidev unvalid compatible with Aarvark SPI Host Adapter one. In slave mode, Aardvark SPI Host Adapter requires 4ms delay between the end of byte n and the start of byte n+1, hence the use of the optional property st,spi-midi-ns. Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
60 lines
2.0 KiB
Plaintext
60 lines
2.0 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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