mirror of https://gitee.com/openkylin/linux.git
165 lines
4.0 KiB
YAML
165 lines
4.0 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/spi/spi-controller.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SPI Controller Generic Binding
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maintainers:
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- Mark Brown <broonie@kernel.org>
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description: |
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SPI busses can be described with a node for the SPI controller device
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and a set of child nodes for each SPI slave on the bus. The system SPI
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controller may be described for use in SPI master mode or in SPI slave mode,
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but not for both at the same time.
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properties:
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$nodename:
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pattern: "^spi(@.*|-[0-9a-f])*$"
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"#address-cells":
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const: 1
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"#size-cells":
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const: 0
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cs-gpios:
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description: |
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GPIOs used as chip selects.
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If that property is used, the number of chip selects will be
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increased automatically with max(cs-gpios, hardware chip selects).
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So if, for example, the controller has 4 CS lines, and the
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cs-gpios looks like this
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cs-gpios = <&gpio1 0 0>, <0>, <&gpio1 1 0>, <&gpio1 2 0>;
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Then it should be configured so that num_chipselect = 4, with
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the following mapping
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cs0 : &gpio1 0 0
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cs1 : native
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cs2 : &gpio1 1 0
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cs3 : &gpio1 2 0
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num-cs:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Total number of chip selects.
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spi-slave:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The SPI controller acts as a slave, instead of a master.
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oneOf:
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- required:
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- "#address-cells"
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- required:
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- spi-slave
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patternProperties:
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"^slave$":
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type: object
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properties:
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compatible:
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description:
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Compatible of the SPI device.
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required:
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- compatible
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"^.*@[0-9a-f]+$":
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type: object
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properties:
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compatible:
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description:
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Compatible of the SPI device.
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reg:
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minimum: 0
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maximum: 256
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description:
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Chip select used by the device.
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spi-3wire:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The device requires 3-wire mode.
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spi-cpha:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The device requires shifted clock phase (CPHA) mode.
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spi-cpol:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The device requires inverse clock polarity (CPOL) mode.
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spi-cs-high:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The device requires the chip select active high.
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spi-lsb-first:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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The device requires the LSB first mode.
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spi-max-frequency:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Maximum SPI clocking speed of the device in Hz.
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spi-rx-bus-width:
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description:
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Bus width to the SPI bus used for read transfers.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [1, 2, 4, 8]
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default: 1
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spi-rx-delay-us:
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description:
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Delay, in microseconds, after a read transfer.
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spi-tx-bus-width:
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description:
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Bus width to the SPI bus used for write transfers.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [1, 2, 4, 8]
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default: 1
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spi-tx-delay-us:
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description:
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Delay, in microseconds, after a write transfer.
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required:
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- compatible
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- reg
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examples:
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- |
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spi@f00 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,mpc5200b-spi","fsl,mpc5200-spi";
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reg = <0xf00 0x20>;
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interrupts = <2 13 0 2 14 0>;
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interrupt-parent = <&mpc5200_pic>;
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ethernet-switch@0 {
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compatible = "micrel,ks8995m";
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spi-max-frequency = <1000000>;
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reg = <0>;
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};
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codec@1 {
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compatible = "ti,tlv320aic26";
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spi-max-frequency = <100000>;
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reg = <1>;
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};
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};
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