dt-bindings: spi: Convert stm32 spi bindings to json-schema
Convert the STM32 spi binding to DT schema format using json-schema Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> CC: Erwan Leray <erwan.leray@st.com> CC: Fabrice Gasnier <fabrice.gasnier@st.com> CC: Amelie Delaunay <amelie.delaunay@st.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20191217090715.13334-1-benjamin.gaignard@st.com Signed-off-by: Mark Brown <broonie@kernel.org>
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Benjamin Gaignard
Mark Brown
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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: Should be one of:
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"st,stm32h7-spi"
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"st,stm32f4-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: Only for STM32H7, (Master Inter-Data Idleness) minimum time
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delay in nanoseconds inserted between two consecutive data
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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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105
Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
Normal file
105
Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
Normal file
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@ -0,0 +1,105 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/spi/st,stm32-spi.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: STMicroelectronics STM32 SPI Controller bindings
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description: |
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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.
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maintainers:
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- Erwan Leray <erwan.leray@st.com>
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- Fabrice Gasnier <fabrice.gasnier@st.com>
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allOf:
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- $ref: "spi-controller.yaml#"
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- if:
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properties:
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compatible:
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contains:
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const: st,stm32f4-spi
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then:
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properties:
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st,spi-midi-ns: false
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properties:
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compatible:
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enum:
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- st,stm32f4-spi
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- st,stm32h7-spi
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reg:
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maxItems: 1
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clocks:
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maxItems: 1
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interrupts:
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maxItems: 1
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resets:
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maxItems: 1
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dmas:
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description: |
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DMA specifiers for tx and rx dma. DMA fifo mode must be used. See
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the STM32 DMA bindings Documentation/devicetree/bindings/dma/stm32-dma.txt.
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items:
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- description: rx DMA channel
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- description: tx DMA channel
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dma-names:
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items:
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- const: rx
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- const: tx
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patternProperties:
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"^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
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type: object
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# SPI slave nodes must be children of the SPI master node and can
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# contain the following properties.
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properties:
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st,spi-midi-ns:
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description: |
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Only for STM32H7, (Master Inter-Data Idleness) minimum time
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delay in nanoseconds inserted between two consecutive data frames.
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required:
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- compatible
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- reg
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- clocks
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- interrupts
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/clock/stm32mp1-clks.h>
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#include <dt-bindings/reset/stm32mp1-resets.h>
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spi@4000b000 {
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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 = <0x4000b000 0x400>;
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interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&rcc SPI2_K>;
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resets = <&rcc SPI2_R>;
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dmas = <&dmamux1 0 39 0x400 0x05>,
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<&dmamux1 1 40 0x400 0x05>;
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dma-names = "rx", "tx";
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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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...
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