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Unverified Commit cc0f6e96 authored by Rob Herring's avatar Rob Herring Committed by Mark Brown
Browse files

spi: dt-bindings: Convert Arm pl022 to json-schema 



Convert the Arm pl022 binding to DT schema format. The clock binding was
missing, so it is added to the schema. It really should be required as
well, but there are some platforms (spear) not yet using DT clock
binding.

Cc: Mark Brown <broonie@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-spi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent af505208

Documentation/devicetree/bindings/spi/spi-pl022.yaml

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# SPDX-License-Identifier: GPL-2.0

%YAML 1.2

---

$id: http://devicetree.org/schemas/spi/spi-pl022.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: ARM PL022 SPI controller



maintainers:

  - Linus Walleij <linus.walleij@linaro.org>



allOf:

  - $ref: "spi-controller.yaml#"



# We need a select here so we don't match all nodes with 'arm,primecell'

select:

  properties:

    compatible:

      contains:

        const: arm,pl022

  required:

    - compatible



properties:

  compatible:

    items:

      - const: arm,pl022

      - const: arm,primecell



  reg:

    maxItems: 1



  interrupts:

    maxItems: 1



  clocks:

    maxItems: 2



  clock-names:

    items:

      - enum:

          - SSPCLK

          - sspclk

      - const: apb_pclk



  pl022,autosuspend-delay:

    description: delay in ms following transfer completion before the

      runtime power management system suspends the device. A setting of 0

      indicates no delay and the device will be suspended immediately.

    $ref: "/schemas/types.yaml#/definitions/uint32"



  pl022,rt:

    description: indicates the controller should run the message pump with realtime

               priority to minimise the transfer latency on the bus (boolean)

    type: boolean



  dmas:

    description:

      Two or more DMA channel specifiers following the convention outlined

      in bindings/dma/dma.txt

    minItems: 2

    maxItems: 32



  dma-names:

    description:

      There must be at least one channel named "tx" for transmit and named "rx"

      for receive.

    minItems: 2

    maxItems: 32

    additionalItems: true

    items:

      - const: rx

      - const: tx



patternProperties:

  "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":

    type: object

    # SPI slave nodes must be children of the SPI master node and can

    # contain the following properties.

    properties:

      pl022,interface:

        description: SPI interface type

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - enum:

              - 0  # SPI

              - 1  # Texas Instruments Synchronous Serial Frame Format

              - 2  # Microwire (Half Duplex)



      pl022,com-mode:

        description: Specifies the transfer mode

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - enum:

              - 0  # interrupt mode

              - 1  # polling mode

              - 2  # DMA mode

            default: 1



      pl022,rx-level-trig:

        description: Rx FIFO watermark level

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - minimum: 0

            maximum: 4



      pl022,tx-level-trig:

        description: Tx FIFO watermark level

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - minimum: 0

            maximum: 4



      pl022,ctrl-len:

        description: Microwire interface - Control length

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - minimum: 0x03

            maximum: 0x1f



      pl022,wait-state:

        description: Microwire interface - Wait state

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - enum: [ 0, 1 ]



      pl022,duplex:

        description: Microwire interface - Full/Half duplex

        allOf:

          - $ref: "/schemas/types.yaml#/definitions/uint32"

          - enum: [ 0, 1 ]



required:

  - compatible

  - reg

  - interrupts



examples:

  - |

    spi@e0100000 {

      compatible = "arm,pl022", "arm,primecell";

      reg = <0xe0100000 0x1000>;

      #address-cells = <1>;

      #size-cells = <0>;

      interrupts = <0 31 0x4>;

      dmas = <&dma_controller 23 1>,

        <&dma_controller 24 0>;

      dma-names = "rx", "tx";



      m25p80@1 {

        compatible = "st,m25p80";

        reg = <1>;

        spi-max-frequency = <12000000>;

        spi-cpol;

        spi-cpha;

        pl022,interface = <0>;

        pl022,com-mode = <0x2>;

        pl022,rx-level-trig = <0>;

        pl022,tx-level-trig = <0>;

        pl022,ctrl-len = <0x11>;

        pl022,wait-state = <0>;

        pl022,duplex = <0>;

      };

    };

...

Documentation/devicetree/bindings/spi/spi_pl022.txt

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ARM PL022 SPI controller



Required properties:

- compatible : "arm,pl022", "arm,primecell"

- reg : Offset and length of the register set for the device

- interrupts : Should contain SPI controller interrupt

- num-cs : total number of chipselects



Optional properties:

- cs-gpios : should specify GPIOs used for chipselects.

  The gpios will be referred to as reg = <index> in the SPI child nodes.

  If unspecified, a single SPI device without a chip select can be used.

- pl022,autosuspend-delay : delay in ms following transfer completion before

			    the runtime power management system suspends the

			    device. A setting of 0 indicates no delay and the

                            device will be suspended immediately

- pl022,rt : indicates the controller should run the message pump with realtime

             priority to minimise the transfer latency on the bus (boolean)

- dmas : Two or more DMA channel specifiers following the convention outlined

         in bindings/dma/dma.txt

- dma-names: Names for the dma channels, if present. There must be at

	     least one channel named "tx" for transmit and named "rx" for

             receive.





SPI slave nodes must be children of the SPI master node and can

contain the following properties.



- pl022,interface : interface type:

	0: SPI

	1: Texas Instruments Synchronous Serial Frame Format

	2: Microwire (Half Duplex)

- pl022,com-mode : specifies the transfer mode:

	0: interrupt mode

	1: polling mode (default mode if property not present)

	2: DMA mode

- pl022,rx-level-trig : Rx FIFO watermark level

- pl022,tx-level-trig : Tx FIFO watermark level

- pl022,ctrl-len : Microwire interface: Control length

- pl022,wait-state : Microwire interface: Wait state

- pl022,duplex : Microwire interface: Full/Half duplex





Example:



	spi@e0100000 {

		compatible = "arm,pl022", "arm,primecell";

		reg = <0xe0100000 0x1000>;

		#address-cells = <1>;

		#size-cells = <0>;

		interrupts = <0 31 0x4>;

		dmas = <&dma-controller 23 1>,

			<&dma-controller 24 0>;

		dma-names = "rx", "tx";



		m25p80@1 {

			compatible = "st,m25p80";

			reg = <1>;

			spi-max-frequency = <12000000>;

			spi-cpol;

			spi-cpha;

			pl022,interface = <0>;

			pl022,com-mode = <0x2>;

			pl022,rx-level-trig = <0>;

			pl022,tx-level-trig = <0>;

			pl022,ctrl-len = <0x11>;

			pl022,wait-state = <0>;

			pl022,duplex = <0>;

		};

	};